j29 sailboat specs

The J29 fr is a 29.5ft fractional sloop designed by Johnstone and built in fiberglass by J Boats between 1982 and 1987.

298 units have been built..

The J29 fr is a light sailboat which is a very high performer. It is stable / stiff and has a low righting capability if capsized. It is best suited as a racing boat.

J29 fr for sale elsewhere on the web:

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First impressions Johnstone has always had an uncanny ability to design incredibly fast boats that manage to sail well across the spectrum and also maintain a handsome bearing on the water. Many of today's fast boats are almost garish in appearance with their plumb bows and abrupt hull shapes designed for downwind flying. It's as if they are craving attention, like a teenager's tattoos, declaring, "Look at me I'm fast." I suspect in 10 or 15 years, these boats will look completely outdated, replaced by the latest and greatest ideas for generating boat speed. Johnstone's boats on the other hand look like boats, not platforms designed to skid across the water faster than the next platform. And as we all know, most sailing is upwind, an area in which his boats often excel. The J/29 is able to carry a full main in 15-plus knots, making 6.5 knots of boat speed. The 29 began life as a modified J/30 and the rakish lines are quite similar. On the 29, however, Johnstone lowered the freeboard, redesigned the keel and trimmed the weight. Although it has 4 inches less LOA and the same 11-foot beam, the 29 weighs 1,000 pounds less and has almost as much sail area. Naturally, the 29's vertical center of gravity is lower than the 30's. And although most 29s were built with fractional rigs, a masthead rig was an option. Simplicity was hard-wired into the boat: From an outboard motor for auxiliary power, to the outboard rudder, to a lack of runners on the fractional rig, the J/29 has always been a boat that you can jump aboard and sail because not a lot of set-up is required. The boat sails well under main alone, and even with a moderately size genoa, the loads are rarely excessive. It is an easy boat to sail well.

Construction The J/29 was never intended to be a ULDB, at least in comparison to West Coast boats, and the construction reflects this philosophy. The similarly sized Olson 30, for example, displaces just 4,000 pounds, while the J/29 tips the scales at 6,000 pounds. Within the framework of being a performance boat, the build is actually rather robust. The hull and deck are balsa cored and joined on a typical inner flange, incorporating the teak toerail where applicable. Tillotson-Pearson, which has since pioneered the SCRIMP manufacturing process, has always done good glass work, and the 29 has some interesting beefed-up specifications. The main bulkhead, a well documented problem in the J/24, and the keel floors are actually culled from the same scantlings as the J/36. A large fiberglass molding is used as a floor and furniture pan, which helps stiffen the hull and originally streamlined the manufacturing process. The high-aspect outboard rudder is attached to the transom with stainless steel pintles and gudgeons. Most of the deck hardware is through-bolted and accessible, an important feature on a boat where the fittings may need to be replaced and updated due to regular racing wear and tear.

What to look for The J/29 has held up extremely well over the years, considering that most of the boats have been sailed hard and often put away wet. Of course, since many 29s are almost 20 years old all age-related problems should be thoroughly inspected before making a decision to buy. Don't overpay for an impressive but old sail wardrobe. In fact, you should consider new sails a given when buying a J/29 because nothing breathes life into this racer like new sails. This is where the boat's simplicity makes it appealing. The rudder pintles and gudgeons are a bit on the light side, and should be replaced if they look at all suspicious, although on the 1983 model I climbed through in Fort Lauderdale, Florida, they were clearly original and in good condition. If the gudgeons have been leaking, be sure to check the transom for delamination since some water may have penetrated the core. Several of the deck fittings on the boat I looked at were cracked, including the aluminum cleats. The hatch cover was also cracked, apparently from being stood on, and the teak handrails were loose. These are all areas that should be carefully examined since deck fitting problems often metamorphose into deck delamination problems. A bit of stomping around revealed some degree of delamination around the sheet winches and in the cockpit. Inside the boat, the molded liner was cracked in several places, obviously from the hull being tweaked now and then. The tabbing on the other hand, at least where I could see, was in good shape. The chainplates also leaked and had soiled the main bulkhead. J Boats had its share of blisters, and some have suggested that the constant fairing of its hulls by owners contributed to the problem by skimming away at the gelcoat. This seems rather unlikely since blisters begin in the laminate. But even so, it is a good idea to find out if and when an epoxy bottom repair job was done.

On deck Because of the J/29's racing pedigree, the deck is well-designed for ease of handling, but the cockpit is not especially comfortable since you actually sit on the aft deck more than in the cockpit, which can be wet to say the least. The mainsheet traveler spans the cockpit and is easily controlled from the tiller. The sheet winches are forward of the traveler, making it a bit awkward for a singlehander, but the boat is ideal for a couple when not racing. The tiller head is stainless steel and the tiller itself is oak and robust. Dual compasses are often set into the coachroof bulkhead, and there is room for instrument displays as well. Double lifelines were standard. The stanchions bases are backed and well-supported, but are often the source of leaks. The pulpits are a bit undersized, and the original nonskid is likely to be worn nearly smooth. Naturally, the headsail tracks are close inboard, and all boats will be set up with spinnaker gear since the 29 predates J Boat's introduction of the retractable sprit. The mast and boom were built by Sparcraft in 4060 aluminum sections. The fractional rig has an air draft of 47 feet, 6 inches while the masthead rig is 4 feet shorter.

Down below The interior of the J/29 is spartan but functional. Low freeboard and a sleek, low-slung coachroof results in a distinct lack of headroom-about 5 feet, 4 inches. The layout includes two quarter berths aft and two settees in the main cabin, perfect for a racing crew. The forward locker may be a sail locker, or it may have been converted into a double berth. Some boats were fitted with manual heads, although most will have porta potties. At least the boat complies with EPA regulations. The galley originally consisted of an Igloo cooler and a sink. There is actually a fair bit of teak below, including veneers on the main bulkhead, a teak-and-holly sole and teak companionway steps. I imagine that when refinished the boat can look rather smart.

Engine Although an inboard diesel was an option, J Boats emphasized outboard motors when marketing the boat, again stressing the simplicity theme. As a result most boats have outboards, which are really very practical. Mounted on a transom bracket, a relatively small and light engine pushes the boat at 6 knots. It is also easily removed or stored below for racing. Another advantage of an outboard is that when it is broken you can pop it into the trunk and take it home or drop it off at the shop.

Under way This is what it's all about with a J/29. The boat is fast on all points of sail and truly excels upwind. By all accounts, with the rig tuned the boat can carry a full main and No. 1 genoa in 15 knots true while making 6.5 knots and staying on her feet. The J/29 sails better under mainsail alone than other comparably sized cruiser/racers do with a main and headsail. Trimming up the main generally requires keeping the top battens parallel to the boom, unless it is extremely light, and then the leach must be opened to prevent stalling. In heavy going, the sail needs to be flattened with the backstay and the mainsheet eased to reduce weather helm and excessive heel. Typically headsails are changed before the main is reefed, and the boat is quite stiff in 25 knots with a No. 3 and full main. Reefing the main is reserved for gales. According to the J/29 class association, it is common to fly a No. 1 genoa in up to 20 knots apparent before dropping to the No. 2. The boat handles beautifully under spinnaker, sustaining surfing runs in double digits without undue stress. This point can't be overemphasized; the J/29 is a very controllable, well-built boat that can sail at exhilarating speeds without the accompanying heart palpitations.

Conclusion The J/29 represents an excellent value if you're looking for solid performance but can't bear the thought of new boat prices. With a proud pedigree, good company support, an active one-design class, and prices hovering on either side of $20,000, the J/29 is hard to beat.

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• By Bill Brockway
• Updated: February 8, 2002

The J/29 is a popular boat across the country. TPI in Warren, R.I., built 289 J/29s between 1982 and 1987. Today the boat has an average selling price of $25,000. According to a number of owners, the Rod Johnstone design sails well in all conditions, but does best in moderate wind. Expect to enlist a six- to nine-person crew.

J/29s are noted for their stability. “Even in heavy air,” says one owner, “the helm is comfortable and the boat never feels as if it’s on the edge of a wipeout as do some lighter boats I’ve driven and crewed on.” If you buy a J/29 that was previously raced, you’ll likely find that the foils and hull have already been professionally faired.

The J/29 is available with fractional or masthead rig and either inboard or outboard auxiliary power. According to our race-board denizens, a masthead rig with outboard motor is the most competitive configuration. A laminated racing main, jib, and spinnaker cost approximately $8,500 for a J/29.

J/29 http://j29members.tripod.com Typical monthly costs: $820 Annual budget range: $2,000 to $13,000 PHRF 111 to 120 LOA 29’6″ LWL 25′ Beam 11′ Draft 5′ 6″ Disp. 6,000 lbs. SA 450 sq. ft.

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Official Class of the U.S. Sailing Association

1. OBJECTIVES OF THE CLASS RULES

1.1 The J/29 is a one-design class was created to fulfill the diverse needs of recreational sailors while cruising, day sailing, class Racing Info and handicap Racing Info offshore. 1.2 Except where variations are specifically permitted , J/29s shall be alike in hull, deck, keel rudder, weight and weight distribution, spar construction and equipment. 1.3 All J/29s shall comply with standard building specifications and these Class Rules. No alterations, modifications or additions are permitted unless explicitly state in these Rules. Modifications including coring, drilling out, rebuilding, or replacing materials; grinding, removing or relocating standard equipment in any way to reduce weight, to improve moments of inertia or to change standard shapes. 1.4 Alterations or modifications to standard specifications and these Class Rules shall only be permitted with the joint approval of the copyright holder (J Boats, Inc.) and the J/29 Class Association.  

2. ADMINISTRATION

2.1 Authority The international authority for the J/29 Class shall be the J/29 Class Association on all matters regarding the administration of these rules. 2.2 Language The official language for the Class shall be English. The word"shall" is mandatory. The word "may" is permissive. In the event of dispute over Class Rule interpretation, the English text shall prevail. 2.3 Builders J/29s shall be built only by builders licensed to do so under copyright of J Boats, Inc., 24 Mill Street, Newport, Rhode Island 02840. 2.4 Hull Numbers No yacht shall be deemed to be a J/29 until it has be completed with building number assigned by J Boats, Inc. molded into the transom by a licensed builder in good standing. 2.5 Owner Responsibility It is the responsibility of the owner(s) or in their absence the helmsman, to ensure that the yacht complies at all times while class Racing Info with these Class Rules. 2.6 Membership No J/29 shall race unless the owner(s) and helmsman are members of the J/29 Class Association and their National Sailing Authority (USYRU in the United States).  

3. MEASUREMENT

3.1 A J/29 shall only be measured by a measurer recognized by National Sailing Authority or the J/29 Class Association. 3.2 A measurer shall not measure a yacht, spar, sails or equipment owned by himself, or in which he is an interested party or has a financial involvement. 3.3 Tolerances in measurements stated in the rules or specifications are to provide for minor building variations. 3.4 The method of measurement , unless otherwise stated, shall be in accordance with the recommendation of the IYRU. 3.5 Any alleged or suspected alteration(s) to the configuration or design of the hull, keel, rudder, equipment, spars, interior standard construction or their location and weights for which specific descriptions are not stated in the rules or specifications, or following a protest concerning same, shall be compared by a Measurer appointed by the J/29 Class Association to a sample of four (4) other yachts similarly rigged. The disputed yacht shall be accepted if she doesn't show any evidence of having been altered and if she has dimensions equal to, or between, those of the maximum and minimum dimensions obtained from the sample of the four other yachts. If there is evidence of any alterations having been made or if the dimensions are greater or less than those of the four other yachts sampled, the matter shall be referred to the J/29 Class Association. 3.6 Sails shall be measured by an PHRF, MORC, IMS certified sailmaker, who shall sign and date measurements. Measurer will verify that sails do not exceed specified dimensions for applicable sail plans.  

4. CONSTRUCTION OF THE HULL AND DECK

4.1 The hull, deck, standard interior layout between companionway and main bulkhead, and structural members shall conform to standard building specifications and molded where applicable from production tooling approved by J Boats, Inc.  

5.1 The rudder blade shall be molded from production tooling by a builder license by J Boats, Inc. 5.2 The weight of the rudder blade shall be not less than 25 kgs . 5.3 Modification of rudder and tiller hardware is not permitted. Owners may replace the tiller with another wood tiller of any length or may use any design of hiking stick. Worn gudgeons and pindles may be replaced provided that such a replacement does not change the location or steering characteristics of the rudder from their factory standard. 5.4 The rudder blade may be faired to the shape described by minimum offset dimensions of PLAN A, except that such fairing shall not remove glass fiber content of the rudder laminate provided from the builder. Temporarily suspended pending validation of Plan A.  

6.1 The keel shall be molded in lead from keel molds approve by J Boats, Inc., and be supplied only by a license building of J Boats, Inc. 6.2 The weight of the keel , prior to attachment to the hull, shall be recorded by the builder and shall be 977 kgs +/- 2.5% . 6.3 The keel may be faired to the minimum dimensions described by offsets of PLAN A. The shape of the keel shall not be altered from those described by the offsets. Temporarily suspended pending validation of Plan A.  

7. MAST & BOOM

7.1 Mast and boom spars shall be constructed of aluminum alloy and shall not differ from the factory original in dimensions, weight, spreader location or sweep unless otherwise permitted in these rules. 7.2 The mast for the standard fractional rig or the factory option masthead rig shall not be altered in design, weights, spreader location, spreader sweep or fittings unless elsewhere permitted in these Rules. 7.3 Measurement bands of contrasting color, 25 mm in width , shall encircle the mast (2) and boom (1) to define the limits of the "P" and "E" dimensions for the rig provided (masthead or fractional). 7.4 The mast shall be securely fixed at the mast step and at the partners. The mast base shall not be moved during a race.  

8. STANDING RIGGING

8.1 The mast standing rigging may be of stainless steel rod or multi-strand wire of a diameter or tensile strength not less than that supplied standard for the application by the builder. 8.2 A pair of single checkstays is permitted with the masthead rig option. Checkstays must be attached to the mast at the points originally provided by the manufacturer. Fractionally rigged boats may be equipped with running backstays, but yachts so equipped will loose the 3 second per mile time credit.  

9. RUNNING RIGGING

9.1 Running rigging for the control of sails and the backstay shall meet or exceed strength specifications of that provided from the builder in the original design.

10. DECK HARDWARE

10.1 No restrictions on deck hardware, except there can not be electric or hydraulic powered or actuated equipment unless given an exemption for physically handicapped sailors on an individual basis. Exceptions for disabled sailors must be requested (and will only be given) in writing.

11.1 Sails shall be constructed and measured in accordance with sail measurement instructions except where otherwise stated herein. Sails shall be measured by an PHRF, MORC, IMS certified sailmaker, who shall stamp and sign/ date measurements. Measurer will verify that sails do not exceed specified dimensions for applicable sail plans. 11.2 Sail numbers shall be placed immediately above the third batten down from the head of the mainsail , on genoas with LP over 120% in line with mainsail numbers and on the spinnaker. The starboard or forward number shall be on top. 11.3 Sail numbers shall [be] the same as the hull number, or in accordance with the National Sailing Authority's offshore numbering sequence. 11.4 The J/29 Class emblem if used or installed shall be as on PLAN B, in blue, and contained within two 400 x 800mm rectangles located starboard on top of port, but separated by a 100mm space. The center-lines of he rectangles shall be on a line between mid head and mid foot, between the top and next lower battens. 11.5 MAINSAIL The luff and foot lengths of he mainsail shall not exceed the black band dimensions of the standard fractional or the factory optional masthead rig. Rig: P x E Standard Fractional: 38.8' x 13.0' Optional Masthead: 35.0' x 12.0' The mainsail leech length shall permit the outboard end of the boom to pass over the straight line extension o the lifelines by no less than 150mm (6"). 11.6 There is no limit on the number or design of collision, telltales, or spreader tip windows on the mainsail or genoas. 11.7 GENOAS The length of LP on the largest genoa shall not exceed 18.75 feet . (Note: this is to allow for the great variety of 150-155% restrictions used under IOR, MORC and PHRF handicap rules.) 11.8 SPINNAKERS Minimum cloth weight is 0.50 oz. Maximum girth shall not be greater than 1.8 SPL at any point of the sail. More specifically, the following maximum limits shall apply: Rig: Pole Length x Max Width x Max Luff Length Fractional: 12.5' x 22.5' x 35.3' Masthead: 12.2' x 21.6' x 39.7'

12. SPINNAKER POLE

12.1 Any material may be allowed for spinnaker pole construction.  

13. PERMITTED ADDITIONS AND MODIFICATIONS

13.1 Interior additions to standard specifications to improve accommodations or livability for cruising. The standard interior includes two main cabin bunks, one each side with lee boards. Not required to carry cushions during races. 13.2 Additional sliding cars for use on the gunwale track. 13.3 Replacement mooring cleats or chocks. 13.4 Additional handrails, foot blocks, or lifeline pads. 13.5 Deck prisms or ventilators which shall be watertight when sealed shut. 13.6 Alternate location and design of the backstay system for the standard fractional rig with a power ratio not exceeding 8:1 . Alternate design of the backstay system for the optional masthead rig with no limit on the power ratio, provided there is a safety stop which limits the throw of the mast forward at the tip to a vertical position. 13.7 Jib roller furling system or jib luff groove systems with a fore-and-aft dimension not exceeding 31mm . 13.8 Safety Gear and Equipment: These rules are In no way to be interpreted as being restrictive with regard to safety. Safety devices and equipment prescribed by local rule, government and administrative regulation or owner preference are permitted. 13.9 Instrumentation: No restrictions 13.10 Spare wood tiller and tiller extension of any material. 13.11 Spare spinnaker pole. 13.12 High Technology material (kevlar, spectra, etc...) spinnaker sheets or halyards of the same strength as the Dacron braid of the halyard or sheet replaced.  

14. SPECIFIC PROHIBITIONS WHILE CLASS Racing Info

14.1 Use of hydraulics anywhere for any purpose 14.2 Use of quick throw devices, tracks, or levers on shrouds or headstay. 14.3 No adjustment of shrouds or headstay during a race. 14.4 Lifeline droop exceeding 125mm with a 5 kg. Weight attached. If measured, will be at done at beginning of race or series of race. Not to penalize a racer who sustained damage. 14.5 Relocation or change in length of the mainsheet traveler. 14.6 Spinnaker guy strut. 14.7 Notwithstanding the requirements of Racing Info Rules 60 & 66, hanging on the mast or shrouds to promote roll tacking or gibing. 14.8 A total crew weight, including helmsman, not to exceed 1,500 pounds.  

15. ADDITIONAL RULES TO APPLY WHEN CLASS RACING INFO

15.1 Safety Equipment — shall comply with ORC category 4 , unless otherwise specified by the sailing instruction or by these rules. 15.2 Sail Limitations — Only 5 headsail's (including spinnakers) may be designated, registered if required for a regatta or weekend series, and used during a regatta or weekend series. The designation and registration must be done at the beginning of a regatta or weekend series. Only headsail's that have been designated may be carried while racing.  If a headsail is damaged during a regatta or weekend series, another headsail may be substituted for the damaged headsail provided such substitution is approved in advance either:  a by the race committee chairman or b by a committee of representatives from 3 other J/29's competing in the event.  The other 3 J/29's will be selected at random.

  A storm jib or storm trysail may be carried for safety and not counted in this number.

15.3 Performance Equalization — Masthead/Outboards are the base boat. To that, add the applicable additives. (I.E. Standard Fractional Rigged/Inboard would get 6sec/mile)

• Optional masthead rig with SPL of 12.2 — 0 sec/mile
• Standard Fractional rig with SPL of 12.5 and no running backstays — 3 sec/mile
• Standard Fractional rig with SPL of 12.5 and/or running backstays — 0 sec/mile
• Inboard diesel option with standard folding prop — 3 sec/mile

15.4 Helmsman's Rule — The primary helmsman of the yacht shall be the owner, a member of the owner's immediate family, designated (registered) helmsman or a chartering skipper paying a non-trivial, legitimate charter fee to the yacht's owner. The primary helmsman must be at the helm at the start and first leg of 4 miles or less.

15.5 ( New ) Limitation on professional sailors — no more than 2 class 3 or 3 class 2 or combinations adding up to max value of 6 per boat, as defined by U.S. Sailing. A professional who is an owner is not counted under this rule.

OFFICIAL KEEL DRAWING AND OFFSETS

Temporarily Suspended

(DIMENSIONS IN MILLIMETERS) Section Root: 0 1 2 3 4 4.5 5 5.5 6 Location: 0 230 460 690 920 1035 1150 1265 1380 Chord Length (x): 1470 1320 1170 1020 870 795 720 645 570 Leading Edge Radius: 13.0 13.0 13.0 13.0 13.0 13.0 13.0 11.5 6.5   (x) Section ½ Widths (y) .0125 18.0 18.0 18.0 10.0 16.3 15.4 13.7 12.2 8.0 .0250 25.9 25.9 25.9 25.9 23.9 22.1 19.4 16.7 11.1 .05 35.2 35.2 35.2 35.2 33.1 31.0 27.2 22.1 15.0 .10 47.6 47.6 47.6 47.6 44.7 42.0 36.7 29.6 20.5 .15 55.1 55.1 55.1 55.1 51.9 49.0 42.7 34.3 23.9 .20 60.7 60.7 60.7 60.7 57.0 54.0 47.0 37.7 26.2 .25 64.2 64.2 64.2 64.2 60.3 57.0 49.8 39.9 27.7 .30 65.9 65.9 65.9 65.9 61.9 58.3 50.9 40.8 28.4 .35 66.0 66.0 66.0 66.0 62.0 58.4 51.0 40.9 28.5 .40 64.0 64.0 64.0 64.0 60.0 56.5 49.3 39.6 27.6 .50 58.2 58.2 58.2 58.2 54.7 51.5 45.0 36.1 25.1 .60 50.3 50.3 50.3 50.3 47.2 44.2 38.8 31.2 21.7 .70 40.0 40.0 40.0 40.0 37.6 35.4 30.9 24.8 17.3 .80 28.9 28.9 28.9 28.9 27.1 25.6 27.3 17.9 12.5 .90 15.9 15.9 15.9 15.9 14.9 14.0 12.2 9.8 6.9 Trailing edge 2.8 2.8 2.8 2.8 2.6 2.4 2.1 1.7 1.2 *Vertical distance down from the hull, where it intersects the trailing edge of the keel, on the straight line to a point 90mm forward of the trailing edge of the keel at the bottom tip.  

RUDDER PLAN AND OFFSETS

Temporarily Suspended ( DIMENSIONS ARE IN MILLIMETERS ) Section A is perpendicular to the leading and trailing edges. Rudder tip is rounded and is defined by a semi-circle at any given xc station below the lower limit of section A whose radius is equal to the yc thickness at that station. Xc station Yc ½ width 5mm 10.0 10mm 12.8 21mm 16.5 41mm 20.6 62mm 23.9 82mm 25.9 103mm 27.2 124mm 28.0 144mm 28.4 165mm 28.3 206mm 26.3 247mm 22.5 288mm 18.0 329mm 12.8 370mm 7.7 TE 2.4 Caution: A Offsets represent minimum dimensions — half width thickness may be two millimeters greater than what is shown. Do not sand molded fiberglass off leading or trailing edges.  

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• Sailboat Guide
• Description

Seller's Description

J/29, 1984 Price $18,050 Location DCYC Marina, Lake Dallas

Price includes Mercury 5HP outboard motor and a trailer with 3 axles.

Designed by Rod Johnstone

Refurbished in 2016. Clean boat stored on hydrohoist for last 20 years. Professionally fared hull. Ready to go!

This J Boat J29 sailboat for sale includes Trailer and a 2016 Nissan 6HP outboard.

Optional: 8,800 lb HydroHoist Ultra Level Lift 2 (2016) for additional $8,500

LOA: 29’ 5” LWL: 25’ Beam: 11’ Draft: 5.6’ Std Water: 4 gallons Lead Keel: 2,100 pounds Headroom: 6’ 4” Height with Keel: 10’

Mainsail: 252 sq ft Jib: 210 sq ft

Tiller Steering Mainsail Cover Stainless Steel Ladder Compass Traveler located in cockpit

Boat refurbished in 2016 Gel coat on sides in 2016 Mast painted (2016) interior painted (2016) Floor refinished (2016) new Garmin 741 with Bluechart and inland lakes. Depth/Speed (2016) New lifelines (2016) Interior LED lights (2016) New forestay (2016) Spin lock rope clutch (2016) solar vent (2016) New bottom VC Offshore (2016) Trailer tires (2016) Nissan 6hp Sailmaster gas motor (2016) Main cover (2019) Lifeline cushions (2018)

2 jibs (one 10 races old, one 10 years old) 2 genoas (one with 15 races, one 10 years old) 3 spinnakers (one with 10 races, 2 10 years old) main (8 years old)

Note: All sails built by Bill Draheim

or phone 214-673-7245

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)

Dimensions for masthead rig. See J/29 FR for more details.

This listing is presented by SailingTexas.com . Visit their website for more information or to contact the seller.

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• J/70 (22.8')
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