Interlake Sailing Class Association

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One-Design Class Type: Dinghy

Was this boat built to be sailed by youth or adults? Both

Approximately how many class members do you have? 100

Photo Credit:Lisa Aspery

interlake sailboats

Photo Credit: Celtic Girl Travels

interlake sailboats

Photo Credit: Lisa Aspery

interlake sailboats

About Interlake Sailing Class Association

The Interlake Sailing Class has something for everyone, and has been providing the best of racing and fellowship for nearly 100 years! Our goal has always been to be a Midwest regional class and to promote high-level competition in a friendly atmosphere. Members not only value the feel and performance of the boat, as well as the competition, but also enjoy the festivities which surround the events. This philosophy has served the class well for over seventy years. “Extremely tactical” is the way multi-class champion George Fisher describes Interlake racing. “The stiff mast makes a great equalizer,” says George. This fact also allows the skipper to tune into the great feel and responsiveness of the boat and concentrate on wind and tactics . . . not tweaking the rig. Interlake racing is tight!

“Our mission is to create an environment that promotes keen and friendly competition with an emphasis on teaching and assisting the entry-level sailor. The ISCA is committed to growth through the managing of sales, distribution, and marketing of the Interlake boat.”

Boats Produced: 1450

Class boat builder(s):

Customflex Terry Kilpatrick (419) 349-6109 [email protected]

Approximately how many boats are in the USA/North America? 500

Where is your One-Design class typically sailed in the USA? List regions of the country:

Ohio, Michigan, Indiana

Does this class have a spinnaker or gennaker? Yes

How many people sail as a crew including the helm?  2-3

Ideal combined weight of range of crew:  400

Portsmouth Yardstick Rating:   90

Boat Designed in  1933

Length (feet/inches): 18′

Beam: 6′ 3″

Weight of rigged boat without sails: 650

Draft: Board Up: 8″ Board Down: 4′ 7″

Mast Height: 24′

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November 30, 1999 by Sail1Design Editor 2 Comments

From the class association: The Interlake is one of those “best kept secrets.”  Many sailors are not familiar with the design.  It has to do with approach.  The class has been strong since day one.  There simply has never been a huge marketing blitz.  The class just never wanted to be part of the international scene.  The goal has always been to be a Midwest regional class and to promote high level competition in a friendly atmosphere.  Members not only value the feel and performance of the boat, as well as the competition, but also enjoy the festivities which surround the events.  This philosophy has served the class well for over seventy years.  Not only has the class remained active and healthy, but members have competed well in the prestigious U.S.S.A. Champion of Champions Regatta, and served on U.S. Sailing’s Executive Committee.

The Interlake was commissioned by the Sandusky Sailing Club in 1933.  Francis Sweisguth, who had already designed the Star, was hired to develop a boat for the waters of Lake Erie and Sandusky Bay.  The craft was to be tactical with a good turn of speed, raced by two to three people and also accommodate four or more adults for a comfortable day sail.  It needed to be easily trailerable and easy to sail.  The result was the Interlake.  (It also singlehands very well).

When examining the Interlake the graceful similarities with the Star’s lines are immediately noticeable.  This accounts for the incredible feel.  Further investigation reveals a sail plan that is simple to rig, simple to sail, and full of performance.  In fact, today’s hottest new designs (the expensive sport boats) have rigs remarkably similar to the Interlake’s.  Details such as:  a large roachy main, smaller 110% jib, fractional rigging, and no backstay are similarities to both designs.  This simple rigging not only produces turnkey speed, but also makes trailering a breeze.  The Interlake is also built to last.  Twenty plus year old boats still win the Nationals.  They just keep going and going . . .

Generations and Genders    When sailing an Interlake you can expect a dry ride (in most conditions), good upwind ability, smooth planing off the wind, and good speed at deep sailing angles.  Acceleration is good, better than with most similar dingy classes (such as the Lightning or Flying Scot), and maneuverability is exceptional.  The helm is light and responsive, immediately telling the skipper what to do.  If the skipper doesn’t listen, the boat simply goes a little slower . . . it won’t break anything or throw the crew in the drink (like a Laser might!).  All the basic controls are there to adjust the sails to the conditions.  Then just trim and go.  The straight ahead nature allows performance at peak level without a lot of tweaking.  Not only is it fun to go fast, but this makes the Interlake an extremely tactical boat.

The only way to truly understand that this is just part of the story is to take a ride.  Yet the best part of the class is not the boat, but the sailors.  Sailors who cheerfully share their knowledge because they enjoy close competition.  Sailors who keep the good times going off the water as well.  The Interlake and the company it keeps are, well, . . . irresistible.

INTERLAKE SPECIFICATIONS Length: 18′ 0″ Beam: 6′ 3″

DRAFT: Board Up: 8″ Board Down: 4′ 7″

Displacement: 650 lbs.

Racing Crew: 2 or 3

SAIL AREA Main: 125 sq. ft. Jib: 50 sq. ft. Spinnaker: 200 sq. ft.

Class website: http://www.interlakesailing.org/

Reader Interactions

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May 16, 2021 at 15:58

I sure would like to find one . Not a creampuff or a project boat but a nice clean strong boat . I am not sure about the wide deck or the one with the built in seating. I would guess the one with built in seats would be for me as I am in my late 70’s and would like to be able to stretch out on the seat for a easy leisurely sail.

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September 27, 2022 at 12:39

I have a wide deck model. Hull 206. They rails are just about the perfect sitting space. I haven’t seen a built in bench model but I image the benches would be too narrow to be cofortable. Some deck models have benches. Mine come with them, but they weren’t installed. I would be willing to sell them if you end up with a wide deck model. They are teak. The hulls are tough, and boat is really a joy to sail. And friend and I just sailed from Astoria to Cathlamet, Wa last week. Plained a good stretch of the way. Love this boat.

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My Class, My Story: Interlake

  • By Jim Ward
  • Updated: July 2, 2019

T-10

A surreal emotion sweeps over me as I peel back the stiff canvas cover, exposing my Interlake to the warm July morning sun. The routine of rigging my boat before the day’s race will be the same as it’s always been, but this time, the experience will be different. Dad is no longer beside me, meticulously preparing the boat as he always did, checking control lines for chafe, inspecting every bit of hardware and gliding his hands over the foils to confirm their perfection. That’s how we would rig my Interlake together—until 2012, when cancer suddenly took him.

It’s amazing how a simple sound can extract a memory from deep within. When I hear water slapping the Interlake’s flared bow, its hard chine sluicing through a choppy Sandusky Bay, just as it was designed to do, I think of Dad.

It’s also a sound that draws the happiest memories of sailing with my family, of junior sailing practices and the laughter, fun and freedom of being a carefree teenager on the water. It’s a sound that has bonded me to the Interlake for decades.

Like many of us, I was lucky to discover sailing through my parents, both of whom were outstanding sailors with a genuine love and passion for the sport. Dad won a handful of national championships in the Columbia 26 and Tartan 10 classes. He was calm on and off the water and had a knack for making the boat go a touch faster than any boat around him. I crewed for him for many years, unknowingly soaking up his lessons and wisdom.

When I was very young, I would sit behind Dad during windy races on Wine Squall , the family T-10.

This was the safest spot on the boat for a child, and it allowed me to have the perfect seat to watch him drive through the waves. Dad’s best friend, Jack Mueller—who was always the main trimmer in any large regatta we ever sailed—was also a great teacher, a very accomplished sailor, and class builder for many years for the Lightning and Snipe classes. He was also a man who graced any room he entered with a legendary smile and laugh.

Jack shared the same calm demeanor as Dad, making them a great combination. I learned a great deal watching them sail together over the years.

As I grew older, I was given the opportunity to move forward in the boat, from behind the tiller, to trimming the jib, to even sharing the helm with my father during the North Americans. He and Jack worked well together, always reminding the team that boatspeed was essential, but sailing on the correct side of the course was always more important.

They shared the same perspective that winning was great—but not as important as enjoying our time on the water together. They both had a great feel, and they taught me a great deal when it came to sailing in waves. They were always discussing heel angle, traveler height and how the bow felt going through the chop.

They also had the great ability to forget a poor result, and follow up a bad race with a strong finish to save a series.

RELATED: My Class, My Story: Capri 25

My parents enjoyed sailing together and to make a point of it, they always registered as George and Nancy Ward in any major regatta they ever entered, a tradition my wife Jayme and I continue to this day. In their honor, the T-10 class now awards the Ward Trophy at the annual North American Championship to the top placing husband and wife team.

Sportsmanship was always very important to my father too. He viewed sailing much like running a business: If you treat people with respect, act honestly and avoid conflict whenever necessary, you will generally come out on the winning side of things. After his passing, the Sandusky Sailing Club graciously honored my dad by naming their annual sportsmanship award after him. One of his best friends, Rex Carper, a legendary bowman for many years on Wine Squall , designed and donated a beautiful trophy.

After graduating from ­college long ago, I found myself looking for a place to settle and a small boat I could campaign on my own. The Sandusky Sailing Club in Ohio was an obvious choice. The dry-sail area at the club was forever teeming with Interlakes, which the club commissioned in 1933, and the local fleet, with as many as 40 boats at the time, was an active group.

The Interlake was the work of Francis Sweisguth, who also designed the Star. Sweisguth was hired to develop a centerboard dinghy uniquely designed for Lake Erie’s Sandusky Bay.

Eighteen feet long, easy to trailer, rig and sail, it was the perfect boat for the club. Its bow glides easily through the tight chop that we often have on the bay and the right amount of heel angle greatly affects how the boat performs, in flat water or waves.

My first Interlake was an older model, which I raced for a few years. It was a good boat and I had a great time learning more about the class and what would be required of me to race at a higher level.

Every year, the week before the national championship, Dad and I would get together, go over the boat and make sure it was ready for the regatta. He was a believer in setting up for success before leaving the dock for the first race, so he instilled in me one key element of sailboat racing: If my equipment, rigging, sails and crew are in order, I have no excuse to lose.

One appealing trait of the Interlake is its simplicity. The mast is easy to step, and without spreaders, it’s easy to tune. Dad and I would step the mast together and double check the tuning numbers.

He was a believer in ­having settings that are easy to replicate on the racecourse. We would confirm our mast rake and trim marks on the jib sheets, centerboard and traveler lines to ensure they were in line with baseline settings. We would inspect the centerboard to make sure it hung at the perfect angle in the boat. We’d replace any small items we thought could potentially fail, leaving nothing to chance.

Sailing is a wonderful distraction from life’s woes, which is why I committed to racing as much as possible. Dad would have approved.

The older I got, the more I enjoyed this time with him. As an engineer, he thought about things differently than I. He preferred listening to talking, but he always thoughtfully answered any question I asked. I eventually saved enough money to buy a new Interlake from Customflex.

Terry Kilpatrick was building them at the time, and the process of creating a boat with him was one of the most enjoyable experiences of my life. Kilpatrick and his wife, Karen, are two of the kindest people I’ve ever met and with them it was more than a boatbuilding exercise. It was family bonding. He allowed me to get as involved in the build process as I wanted. I would visit them on the weekends. Terry would let me lend a hand with the lay-up and rigging.

I met my wife while racing Interlakes, and Kilpatrick worked with the two of us so the boat was rigged for her to be able to easily reach and pull control lines. He’s the only Yale-educated boatbuilder I’ve ever met, and the care and intelligence he put into building boats was remarkable. I wanted to add a custom teak rub rail around the boat because I liked the way it looked—it added a touch of the past to the new boat.

Kilpatrick spent hours working on that rail, and the finished product looks fantastic to this day. A handful of other owners eventually asked for teak rails too, and I feel good knowing he probably cursed my name each time he added one to a new hull. He has since retired, but today, Wes Blazer, of Weatherly Boat Works in Port Clinton, Ohio, builds Interlakes in the same meticulous manner. The boats remain an incredible value considering the craftsmanship and care that goes into each build.

In 2012, the Interlake Nationals were scheduled for North Cape YC in LaSalle, Michigan. North Cape is a special place for me because my grandfather, whose name I proudly bear, was a founding member. He was the club’s second commodore and my parents held their wedding reception there many years ago. My good friend Jay Mueller—Jack’s son—and I had the event ­circled on our calendars for years, and we were really looking forward to it. We’d sailed a Snipe Junior Nationals together at North Cape many years earlier and we’d always looked forward to returning for a regatta of some sort. Jay lived in Connecticut and came back for a few regattas every year.

We’d always enjoyed sailing with one another, so teaming up for Nationals was something we had to do.

When my dad passed away earlier that year, it was hard on the family. Sailing, however, is a wonderful distraction from life’s woes, which is why I committed to racing as much as possible. Dad would have approved.

Leading up to the Interlake Nationals, Jay and I raced major events in everything we could get our hands on: T-10s, J/24s, Lightnings and Interlakes. When Nationals finally rolled around in July, I truly felt we were ready.

Dad, of course, would have expected nothing less.

We won both races on the first day, but our great friends and rivals, Skip Dieball and his crew Jeff Eiber, came back strong to tie the series before the final race. We had some fortunate breaks in that race and crossed the finish line overlapped with Dieball and Eiber, so I was overcome with happiness when the race committee acknowledged we’d won. At the awards ceremony, Dieball gave a gracious speech, mentioning my dad and how special the event was for both of us. I remember his kind words today and will always look back on that regatta with a belief that it all came together at the right time.

After racing, I methodically secured the Interlake’s deck cover, closing the boat like a journal, full of memories and thoughts of Dad, my wife, Jack, Terry and Jay—all of whom have influenced me in more ways than I’ll ever know.

These are the influencers in my life, but it’s also this 18-foot fiberglass boat, designed ages ago for a much different purpose, that has defined my life and who I am today.

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Latitude 42° 24' 51.3936'' N, Longitude 83° 55' 5.2032'' W

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Interlake 18′

Never before have comfort and performance been so successfully integrated into a one design sailboat. Not only is the Interlake an exciting and challenging boat to race, it is also the perfect boat for a leisurely sail with family or friends. Its efficiently designed cockpit allows you to daysail comfortably with 2 to 6 adults. The large, dry storage area under the front deck provides lots of storage space for racing gear or picnic supplies. The hard chine hull adds stability without adding weight, while the rocker keel allows quick turning, tacking and exceptional maneuverability in tight places.

Generous sail plan makes for a fun boat to sail in light to medium air. – MICHAEL

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Interlake - potential purchase

  • Thread starter Apex
  • Start date Jul 15, 2015
  • Forums for All Owners
  • Ask All Sailors

Apex

Mom (73 but gets around just fine) just bought a house on a lake. She would like to use the sunfish for sailing, but we have opportunity to purchase an Interlake that I believe would be more comfortable for her. Everything is there with exception of a spinnaker, but it does have floor delamination. The outside skin looks solid, the cockpit floor flexes quite a bit. Anyone have experience with this boat? Value and how serious the delam is for putzing around? How difficult is the fix? Thanks in advance for your input!  

31seahorse

Hello Apex, The 1968 edition of The Sailboat Classes of North America says the following about the Interlake: "The 18-foot Interlake sloop, designed by Francis Swiesguth in 1932, came before the planing class erabut has survived. Since being converted from wood to fiber glass in 1955, she has become one of the fast-growing classes. With a hard chine and no "freak characteristics", as someone has described her, she has good stability and is a good all-around boat." Vital Statistics: LOA 18' waterline 15' 3" beam 6' 3" draft without centerboard 8" with CB down 4' 8" sail area 175 sq ft (no spinnaker) weight 650 lb trailerable; racing crew two or three I have never sailed an Interlake, but it looks like a beautiful, dry boat that would be fun for anyone. We owned several Celebrity Class sailboats over the years and the Interlake seems similar although it is described as hard-chined whereas the Celebrity is not. Personally, I would rather see a person "in" a boat like that rather than "on" a board boat like the sunfish. Will the boat stay in the water? On a mooring or on a dock will put some stresses on the hull and the rigging. A frequent check of the rigging would be in order. We bought one of our Celebrity Class boats cheaply because the mast had fallen and damaged the foredeck while the boat was on a mooring. If the boat is hauled out after each use then Mom will probably need help to do that although 650 pounds isn't too much boat to move. That depends on trailer and launch ramp location. The Interlake will probably offer an opportunity for one or more people to accompany her. Best Wishes. RE: cockpit sole delamination. Depends on how it is built. If it is laminated with wood between the layers you will have a real project to remove the inner layer and remove/dry the filler. Not impossible, but a serious job. If you can remove the "floor" layer in large pieces you can epoxy those pieces back into their respective places. Final thoughts: (1) sail the Interlake as it is for a while assuming it does not become waterlogged due to the delamination. (2) Let Mom decide. If she wants to sail the Sunfish let her do it.  

MrBill_FLL

http://sailboatdata.com/viewrecord.asp?class_id=3200 clearly a dryer boat than a sunfish. where is it going to be kept? in the water? (how is she going to get it in / out of water).  

Johnb

The sunfish is dead simple to rig, easy to sail, weighs in at what 120 pounds, and is eminently suitable for someone who just wants to get out for a while on a nice day. It can be bought and maintained for next to nothing and with a simple rig pulled up out of the water when not in use. If the water is less than 75 degrees I would equip the user with a wetsuit, good life jacket and whistle cause you never know when a blow might happen.  

thanks for the replies so far: yes, kept in the water at the dock. the Interlake has locations for a tarp to cover the cockpit, which allows the mast to remain rigged, while the sails should come on/off. We will be doing a sea trial with mom this weekend, and will decide then. Trying to put the Interlake back on the trailer requires a proper launch, we tried (and I am STILL SORE) to beach retrieve....she has a personal access ramp at the house, so perhaps not a big deal, depending on bottom type of the lake.  

I sailed Interlakes for 3-4 years. Still popular in Midwest/Great Lakes. It is a double handed boat though. Designed for the Lake Erie chop but raced everywhere. Easy to service/fix. Mine had a small roller furler with the drum under the deck. That would be a nice feature to add.  

Siamese

You said "the" sunfish, so is do you already own a sunfish? If so, why not sail it, if that's what she wants to do. I sailed on an Interlake just once a long time ago. Liked it. But I wouldn't care to have one that I have to fix. Rather than the either/or you've presented, why not try the Sunfish and you can always find a little 16 footer later...O'Day, etc..  

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Flying Scot vs. Lightning vs. Interlake

  • Add to quote

I am considering purchasing one of these three sailboats and would like to get an opportunity to sail them before purchasing one of them (I live in Michigan). Has anyone sailed more than one of them to be able to compare? Which would you recommend for all around daysailing ? I would like to try sailing the boat on Lake Huron, and on inland lakes in Michigan.  

interlake sailboats

From sailing them as a kid, I can tell you that a Lighting is a lot of work and is a wet boat. It is also not a boat that you would be able to single hand comfortably in anything but very, very light air.  

Flying Scot Personally I chose the Flying Scot. I don't think you could go wrong with either (or a Thistle). I have never sailed a Lightning but watch them at my club. The Flying Scot is a simpler boat. The Lightning has many more 'tweaks' you can do. The Flying Scot is a 'sit-in' boat with real bench seats. I believe the Lightning is a 'sit-on' boat - no backrest. Are you interested in racing? Then you might want to see what the dominant fleet in your area is. The Lightning is a bit higher performance. The Flying Scot is a good all round boat, but doesn't really shine against other classes until the wind pipes up. If you are just day sailing, a couple of other boats to give a thought to are the Boston Whaler Harpoons, the Buccaneer, and the O'Day Day Sailer. What part of Michigan are you in? You might want to check the Flying Scot association ( Flying Scot® Sailing Association, Inc. ) and find a local fleet and see if you can hitch a ride through them. All of the boats mentioned have pluses and minuses. Really depends on your experience, how many are sailing with you, what are their ages, and what you are looking for. I love the Flying Scot as it is pretty stable, comfortable for my non-sailing wife and two young boys (4 + 6), durable, and still has performance to race.  

Thanks to both of you for replying. I am now in my sixties and think a boat that is not quite as challenging as a Lightning might be best for me. I guess I am now leaning more to a Flying Scot or an Interlake. Both are popular in Michigan. I am hoping to hitch a ride on each of these in the Spring. It would be interesting to hear from anyone who has sailed both a Flying Scot and an Interlake.  

One advantage to the Flying Scot is that it is easy to get replacement parts from the builder, and the builder keeps a stock of parts on hand. With the Lightning and Interlake, an older boat may be built by a company now out of business, so any replacement part from another builder may not fit and may have to be modified to work. The Interlake came with two different styles of decks - one that had seats so you could sit in the boat, and one without seats where you sat on the deck. According to the Portsmouth Handicap numbers, the Lightning is the fastest (87.0), then the Interlake (89.1) and the Scot (89.6). The Lightning has a much larger spinnaker, which helps to give it the edge. So for casual sailing, the boat speeds are fairly close. I've sailed both the Interlake and the Scot, but I sailed the Interlake 40 years ago, and the Scot around 20-25 years ago.  

I do not have anything to add concerning the three you mentioned, I think the comments and distinctions made are accurate. All are fine boats. But I would caution you away from the Buccaneer... they are fast and fun, but tender and a real handful... great for racing but not the best for casual daysailing. I do own an O'Day Daysailer... a bit smaller at 17 feet (OK for 4 but no more) but easy to find, inexpensive to buy, easy to trailer and launch (my mid-50s wife and I can be in the water in 15 minutes) and parts are readily available. Performance is (comparitively) on the leisurely side but it will plane in a good wind. The Rhodes 19 is another in this general class that may be worth a look if you found one available.  

I vote for the Flying Scot I've sailed the Scot ( a lot ) and the Lightning ( a little ) and never sailed an Interlake. Having said that, I vote for the Scot for the following reasons: Easy sailing boat, and in my opinion less work to sail than the Lightning, and more forgiving. I've taught many dozens of new sailors how to sail on a Scot, and believe me - they did everything wrong one could imagine, but the boat didn't. It is very hard to capsize, it can be fast, it can be raced or daysailed (one friend even cruised on a Scot for three weeks), and the company that builds them is a great operation to deal with. If I was in the market for a daysailor, I'd go buy a used flying scot in a heartbeat.  

interlake sailboats

I've sailed both Lightnings and Flying Scots. Ended up buying a Flying Scot because it was a lot easier to sale and it was more fun for me (just a personal opinion). The Lightning is faster, but if speed is not high on your list, the Flying Scot is comfortable and safe. If was designed in Port Clinton, Ohio to be a day sailor for Lake Erie, and if you ever got caught in a sudden storm on Lake Erie (I did coming back from Put-In-Bay on my Scot), you will appreciate how the boat handles rough seas.  

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  • Sailboat Guide

Interlake is a 18 ′ 0 ″ / 5.5 m monohull sailboat designed by Francis Sweisguth and built by Customflex starting in 1933.

Drawing of Interlake

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

  • SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
  • D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

  • D: Displacement of the boat in pounds
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

The Interlake was commissioned by the Sandusky Sailing Club in 1933. Francis Sweisguth, who had already designed the STAR, was hired to develop a boat for the waters of Lake Erie and Sandusky Bay. Spinnaker area: 200 sq. ft. Still an active class in the mid west USA.

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Interlake Sailing Class Association National Regatta takes place on Charles Mill Lake

The Mohican Sailing Club hosted the Interlake Sailing Class Association National Regatta for the first time since 1965 on Charles Mill Lake.

More: Photo at Mohican State Park is the winning entry in the Ohio State Parks Photo Contest

The sailing event started Tuesday, July 19 and runs through Saturday, July 23. The winner of the National Regatta will then represent the Interlake Class for this year in the Regatta called the "Championship of Champions."

People who attended were be able to observe from the shore or ride on the observation boat that was on the water during the race.

Interlake boats are less than 25 feet and feature a mainsail, a jib sail and a spinnaker. All Interlake boats are supposed to be the same and during the regatta what the judges are doing is testing the skills of the sailors.

This article originally appeared on Ashland Times Gazette: Mohican Sailing Club hosts National Regatta

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interlake sailboats

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For over 85 years, the versatility of the Interlake Class has made it welcoming to all sailors, from beginners to families and seasoned veterans. Francis Sweisguth, who also designed the Star sailboat, designed the Interlake for the conditions on Lake Erie’s Sandusky Bay and for a crew of two to three, yet it is also popular on inland lakes. Quantum's sail package for this class has been fine-tuned to match the versatility of the boat and help Interlake sailors conquer any challenge. Our mainsails and headsails are designed for high performance and easy trimming in every condition from the first hoist, and the spinnaker is both fast and easy to fly, a perfect combination for sailors of all levels. Quantum Sails supports this class along with the junior sailing programs that make up both the legacy and the future of sailing. Quantum sailors are involved with the Interlake Class and are available to assist customers and support events and programs. For questions about the Interlake Class, please contact Bob Sagan [email protected]

  • Class Experts
  • Links & resources

Interlake Mainsails

Interlake headsails, interlake spinnakers, choose a team member.

Bob Sagan

Career highlights

George Szabo

George Szabo

George grew up in San Diego racing Stars, Lasers and Snipes. As a kid, he made sails for his model boats before eventually taking a part-time job with Quantum during high school and college. He came on full-time in 1993 as a sailmaker and designer. Using the latest computer design programs, George is able to create the fastest, most efficient sails for smaller One Design boats. This technology, combined with his intimate understanding of One Design sailing, allows him to create the most versatile sails available. The San Diego loft designs a variety of One Design sails, including Thistle and Lido 14, but their specialties are Olympic Class Star and Snipe boats. George is the 2009 Star World Champion, as well as an 21-time National/North American Champion. In addition to his sail-making abilities and wins, he is also an accomplished keelboat tactician and trimmer.

  • Nationality: USA
  • Position: Sail and Design Consultant
  • Current Town: San Diego
  • 2011 Star North American Champion
  • 2010 Star North American Champion
  • 2009 Star World Champion
  • 2005 Star North American Champion
  • 2005 Snipe National Champion
  • 2001 Star North American Champion
  • 2000 Snipe North American Champion
  • 2000 Snipe National Champion
  • 1999 Snipe North American Champion
  • 1999 Snipe National Champion
  • 1998 Snipe North American Champion
  • 1998 Snipe National Champion
  • 1997 Snipe North American Champion
  • 1997 Snipe National Champion
Date Regatta Result
Aug 19, 2023 2023 Hot-toTrot Regatta 1, 2
Oct 17, 2021 1*
Sep 19, 2021 1
Aug 17, 2021 2*
Aug 15, 2021 1, 4, 5
  • Interlake Class Website

Documents 

  • Tuning Guide

Managing a Racing Program: Sail and Boat Maintenance

Youth Corner: How to Get the Most Out of Your Coach

Getting to the Starting Line with a Chartered Boat

10 Moves That Don't Work in a Big Fleet

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INTERLAKE TUNING GUIDE

Congratulations on your purchase of North Interlake sails. We are confident that you will find superior speed over all conditions. Time has been spent to insure that not only are your sails fast, but also easy to trim. Please read the following guide, set up your boat to the numbers specified, and go racing! If you have any questions or problems, please don’t hesitate to give us a call. We are anxious to help you go faster and win races.

BASIC RIG SETUP

Mast butt placement at deck.

Maximum forward – 6’4” (76”) from the stem to the forward edge of the mast. Remember that the measurement is from the imaginary intersection of the hull and deck. Do not include the rub rail.

Measure mast rake by hoisting a tape measure on the main halyard and latch it where the halyard would be at the top black band. Pull the tape back to the middle of the transom at the joint between the transom and the deck. The measurement at this point should be 25’3”.

Keep in mind that you will measure your rake measurement when the rig is tensioned, whether it is by jib halyard tension or by tensioning the forestay itself

RIG TENSION

We have found that the Interlake performs best when the rig is set up fairly tight.

There are several different methods Interlake sailors use to set up and tension their rigs when sailing. Some set the forestay very tight and adjust the halyard tension to set the cloth/luff tension. Some set the forestay only snug and then add more tension through adjustment to the jib halyard (which will make the forestay actually become slack as all the tension is taken on the luff wire in the jib) with a powerful block and tackle arrangement.

In either case, ideally the tension will be tight enough that the leeward shroud would just become slack when sailing upwind in a 10 mph breeze.

For those who like to check the rig tension more precisely with a Loos tension gauge, we suggest the tension be set so that the shrouds register around 250lbs In lighter breeze ( below 8mph) ideally the tension will fall between 200 and 250lbs. For breeze over 12 the proper tension will be increased to nearly 340lbs.

CENTERBOARD ANGLE

Your centerboard should never swing farther forward then straight down (leading edge vertical) or perpendicular to the hull when it is lowered to its maximum. If your board swings past vertical, tie a knot in the centerboard pennant to limit its travel.

Some Interlake sailors have had success in heavier winds raising the board slightly in order to help maintain a balanced helm.

JIB LEAD PLACEMENT

Your Interlake jib has a trim line drawn from the clew grommet towards the body of the sail. This line provides the most accurate check for your basic jib lead position (below12 mph winds). Your jib leads should be positioned so that the sheet is a direct extension of this trim line. This is more effective than a measure from the stem because of variations in jib lead fittings, deck styles and small rake differences.

In heavy winds (above 12 mph), move the leads aft 1- 1 1/2 inches from the basic trim line position.

JIB CLOTH TENSION

Setting the cloth tension along the luff of your North jib properly is important in setting up the designed shape. Again there are several different methods used by Interlake sailors the cloth tension.

The “adjustable luff” system means your boat is equipped with an adjustable jib tack/Cunningham. Shackle the luff wire to the bow plate and attach the jib cloth shackle to the grommet in the sail. The tension is usually adjustable back in the cockpit.

The “furler luff” jib is fitted with a small clam cleat near the tack that allows the tension on the cloth to be adjusted independently of the luff wire tension.

Like the adjustable luff jib, the halyard is attached to the luff wire at the head of the jib and usually tensions the rig.

The “Burkhardt luff” system actually has two halyards, one for tensioning the rig (and attaches to the luff wire) and one for adjusting the cloth tension ( and attaches to the grommet in the cloth at the head). This system is used primarily with a jib furler.

In all three systems, adjust the cloth tension just tight enough to barely leave the horizontal wrinkles along the luff that appear as “crows feet” at each snap. In winds above 10-12mph, tension the cloth so that the luff is just smooth and no wrinkles or crows feet are present.

Trim the jib sheet so that in “boat speed” conditions the middle batten is straight aft parallel with the centerline of the boat. In light wind and/or sloppy conditions, ease the jib sheet so the middle batten is angled outboard 10 degrees. Also in breezy conditions, ease the sheet for more twist in the leech.

Only in medium winds and relatively flat water will the jib ever be trimmed so that the middle batten is just slightly hooked to windward and the top batten nearly straight back…and for only short periods of time.

TAPERED BATTENS

Included with your new North mainsail are special tapered battens specifically chosen to perform best with your sail. When inserting the tapered batten, the thinnest end of the batten should be inserted first for the greatest flexibility on the inboard end.

Pull the outhaul tight enough to just induce a slight horizontal wrinkle along the foot. In heavy winds or when the boat is overpowered, tension the outhaul until you will notice a horizontal crease along the foot.

Downwind, ease the outhaul only until the foot is smooth…never to the point of vertical wrinkles off the foot.

Your North mainsail is built with a maximum length luff. As a result, cunningham tension is used to tighten the luff of the mainsail and position the draft (maximum depth) properly ( nearly 45- 50% aft) in the sail.

In light winds (less than 6 mph) there should be small wrinkles perpendicular to the luff all the way from the head to the tack.

In medium winds there should be horizontal wrinkles only in the lower 1/3 to 1/4 on the mainsail.

In heavier winds, tension the Cunningham until the luff is nearly smooth.

MAIN SHEET TRIM

The main should be trimmed so that the upper batten is parallel to the boom (sighted from under the boom looking up the sail).

In lighter winds, or when sailing in a great deal of chop, it is helpful to ease the mainsheet slightly so the upper batten is angled out approximately 10-15º.

In drifting conditions, when the boom is hanging on the leech and hooking the upper batten, set the upper batten parallel to centerline of the boat. Only in drifting conditions should the main be trimmed this way, as this will place the boom approximately 2′ (61 cm) off from centerline.

In very heavy winds ( above 12mph), with the help of the boom vang, set the mainsheet tension so the upper batten is again angled outboard approximately 5º from parallel to the boom. It is important, in winds above 15 mph, to apply heavy boom vang tension so the mast and boom will bend correctly to sufficiently flatten the sail. It has been found that the boom may be deflected from the straight line nearly 3” in heavy breezes. This heavy boom vang tension will help make playing the main much easier, as the sheet will not have quite as much strain as it does in even moderate winds.

Note:   Make sure when rounding the windward mark that the boom vang is eased to your normal downwind trim so more strain is not applied to the mast and boom!

The boom vang is used downwind to keep the upper batten parallel to the boom. A sailcloth telltale is attached to your mainsail leech at the upper batten. This telltale is used to help determine the proper boom vang tension (and therefore mainsail twist) on reaches or runs. Too much or too little vang will stall this telltale and will indicate that vang adjustment is necessary.

Note:   We suggest not using this telltale to determine mainsheet trim upwind  as proper trim upwind will result in the telltale showing a stall 50-75% of the time.)

Upwind, as indicated above, the vang is used in heavy winds to help maintain the upper batten parallel to the boom. If the vang is properly adjusted, when the mainsheet is eased in a puff, the boom moves outboard laterally. When tensioned properly in bigger breeze, there will be as much as 3” of bend in the boom.

The traveler is used to depower and balance the boat by easing the mainsail sideways in heavy winds. When heavy windward helm develops ( the boat wants to turn up into the wind) the traveler is eased to help keep the boat flat. The traveler bridle height should be 24” from deck level to the top of the block, or as high as possible to allow centering the boom in light winds while still allowing enough mainsheet tension to adjust

the leech tension in moderate to heavy breezes. If your bridle height is adjustable, set the height at 28” in light winds and as low as 18-20” in very heavy winds. Be absolutely certain that the traveler height is set so that you will never run out of distance between the traveler blocks on the bridle and the mainsheet block (“two block”). Running out of mainsheet trim before the upper batten becomes parallel with the boom will greatly hinder your Interlake’s ability to point.

SPINNAKER TRIM

Keep the two clews of the spinnaker even with the deck by adjusting your pole height with the topping lift. The halyard should be lowered so that the spinnaker flies 8 inches off the mast and away from the mainsail. Start with the spinnaker pole positioned perpendicular to the apparent wind direction as indicated by the masthead wind indicator. Try to always carry 6-12 inches of curl in your spinnaker luff. No curl means the spinnaker is over trimmed. The crew and the helmsman must work together closely when sailing in heavy winds with the chute. The crew must ease sometimes as much as 3 feet to allow the skipper to bear off in a puff to keep the boat flat. The skipper must always be prepared to ease the mainsail downwind to keep the boat flat and balance the helm.

The only exception to keeping the boat flat is when sailing directly downwind. Under these conditions, balance the helm and allow the spinnaker to swing out behind the mainsail by heeling the boat to windward. Pull the centerboard up as far as possible; only leave enough board down to allow the boat to answer the helm without crabbing sideways or to prevent excessive rolling. If rolling occurs, lower the centerboard at least halfway IMMEDIATELY to prevent the infamous “death roll” to windward, and then pull it back up when the rolling ceases.

OTHER IMPORTANT ITEMS

We suggest sailing with a combined crew weight of 390-460 lbs. Keep the boat almost perfectly flat upwind (except in very light wind) and place the crew weight as far forward as possible. Keep the crew and skipper close together and line up directly behind the shroud when there is enough wind to have all three on the weather rail. The only exception is when sailing in waves where the crew all move back one foot to allow the bow to ride up and over waves more easily.

Rapid tiller movement seems to slow the Interlake. Instead, slow, gradual movements are best when sailing upwind. Tacking is quickest when actually steered through slowly. Keep the boat moving.

ROLLING THE SAILS

Leave the battens in the mainsail. Start at the head of the sail and roll the sail parallel to the seams (which are parallel with the battens so they won’t get twisted). Put the luff end of the sail into the tube bag first. If the jib sheets remain attached, they can be left out of the tube to dry if they are wet.

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COMMENTS

  1. Home

    Sailboat racing is blast and the Interlakes have strong competition that will challenge sailors of all levels and ages. No matter your skill or experience level, there are others at the same level in the Interlake. As a Midwest class, we have many fleets and regattas to chose from. Our Travelers Series features 14 events, most within a few ...

  2. INTERLAKE

    The Interlake was commissioned by the Sandusky Sailing Club in 1933. Francis Sweisguth, who had already designed the STAR, was hired to develop a boat for the waters of Lake Erie and Sandusky Bay. Spinnaker area: 200 sq. ft. Still an active class in the mid west USA.

  3. Interlake (dinghy)

    The Interlake is an American planing sailing dinghy that was designed by Francis Sweisguth in 1932, as a one-design racer and first built in 1933.. The boat design was commissioned by the Sandusky Sailing Club. Sweisguth had already designed the Star keelboat and the Interlake was designed specifically for the conditions found on Lake Erie and in particular on Sandusky Bay.

  4. Boat

    The Interlake is a fast, maneuverable one-design sailboat that is generally sailed with a 2 or 3 person crew. Interlakes have a mainsail, jib, and spinnaker and they are: Just plain fun to sail! Interlakes excel in open water or small lakes and are a very tactical boat in all conditions. Our one-design rules keep the boats virtually identical ...

  5. Interlake Sailing Class Association

    The Interlake Sailing Class has something for everyone, and has been providing the best of racing and fellowship for nearly 100 years! Our goal has always been to be a Midwest regional class and to promote high-level competition in a friendly atmosphere. Members not only value the feel and performance of the boat, as well as the competition ...

  6. People

    The Interlake has endured for over 85 years and they are still being built today! When sailing an Interlake you can expect a dry ride (in most conditions), good upwind ability, smooth planing off the wind, and good speed at deep sailing angles. Acceleration is good, better than with most similar dingy classes, and maneuverability is exceptional.

  7. Interlake

    The Interlake was commissioned by the Sandusky Sailing Club in 1933. Francis Sweisguth, who had already designed the Star, was hired to develop a boat for the waters of Lake Erie and Sandusky Bay. The craft was to be tactical with a good turn of speed, raced by two to three people and also accommodate four or more adults for a comfortable day ...

  8. My Class, My Story: Interlake

    The boats remain an incredible value considering the craftsmanship and care that goes into each build. In 2012, the Interlake Nationals were scheduled for North Cape YC in LaSalle, Michigan.

  9. interlake sailboats for sale by owner.

    30' Etchells 22 Nautical Donations Crowleys Yacht Yard 3434 E 95th St Chicago Il 60617, Illinois Asking $12,000

  10. Interlake 18′

    Interlake 18′. Never before have comfort and performance been so successfully integrated into a one design sailboat. Not only is the Interlake an exciting and challenging boat to race, it is also the perfect boat for a leisurely sail with family or friends. Its efficiently designed cockpit allows you to daysail comfortably with 2 to 6 adults.

  11. Interlake

    The 1968 edition of The Sailboat Classes of North America says the following about the Interlake: "The 18-foot Interlake sloop, designed by Francis Swiesguth in 1932, came before the planing class erabut has survived. Since being converted from wood to fiber glass in 1955, she has become one of the fast-growing classes.

  12. Specifications

    A manufacturer of Interlake sailboats must receive approval from the Interlake Sailing Class Association. 3. An individual building an Interlake must obtain a set of official plans and specifications from the Interlake Sailing Class Association. 4. Official class numbers are assigned to a completed boat when the measurement certificate is ...

  13. Flying Scot vs. Lightning vs. Interlake

    According to the Portsmouth Handicap numbers, the Lightning is the fastest (87.0), then the Interlake (89.1) and the Scot (89.6). The Lightning has a much larger spinnaker, which helps to give it the edge. So for casual sailing, the boat speeds are fairly close.

  14. Interlake

    Interlake is a 18′ 0″ / 5.5 m monohull sailboat designed by Francis Sweisguth and built by Customflex starting in 1933. Great choice! Your favorites are temporarily saved for this session. Sign in to save them permanently, access them on any device, and receive relevant alerts.

  15. Interlake Sailing Class Association National Regatta takes ...

    Sailboats compete at the Interlake Sailing Class Association National Regatta at Charles Mill Lake on Thursday, July 21, 2022. The Mohican Sailing Club hosted the event for the first time since ...

  16. Interlake sailboats for sale by owner.

    Interlake preowned sailboats for sale by owner. Interlake used sailboats for sale by owner.

  17. Competition

    To sail at Nationals you must be a current member of the Interlake Class Sailing Association (ISCA), join or renew, register for the event for Nationals , and get your boat measured to ensure that it meets specifications. This is generally done on the day before racing starts at Nationals. If you have any questions on this, please reach out to ...

  18. Interlake Sails

    Interlake For over 85 years, the versatility of the Interlake Class has made it welcoming to all sailors, from beginners to families and seasoned veterans. Francis Sweisguth, who also designed the Star sailboat, designed the Interlake for the conditions on Lake Erie's Sandusky Bay and for a crew of two to three, yet it is also popular on ...

  19. INTERLAKE TUNING GUIDE

    The only exception is when sailing in waves where the crew all move back one foot to allow the bow to ride up and over waves more easily. STEERING. Rapid tiller movement seems to slow the Interlake. Instead, slow, gradual movements are best when sailing upwind. Tacking is quickest when actually steered through slowly. Keep the boat moving.

  20. Listing Category

    Sailboats 228 views Interlake 1335 has a white hull and white deck with integral cockpit seats, cut-down centerboard trunk, stainless steel centerboard, and factory flotation.

  21. Interlake Fleet #1

    Arrive at SSC between 6:00 & 6:30 PM (5:15 - 5:45 after Sept. 1) on Wednesday evenings or 8:00 & 8:30 AM on Sunday mornings. Seasonal Series Racing - Notice of Race - Results. Pix from a Wednesday evening of Interlake racing at SSC (click 'em) Links: SANDUSKY SAILING CLUB. Interlake Sailing Class Association.

  22. Classifieds

    Category: Classifieds All representations are solely the responsibility of the submitter.