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sailboat folding propeller

3-Blade Folding Propeller

3-blade Gori Folding Propeller

Overdrive function, less is more, full speed under sail, practically designed for most engine sizes, related products.

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GORI 3-Blade Propeller

The gori 3-blade folding propeller is available for installation on vessels with engines from around 10bhp to 300+bhp..

This unique design offers an “overdrive feature”, with 2 controlled pitch settings in forward and full reverse thrust. The “overdrive feature” gives lower engine RPM for the same cruising speed when in calm waters or motor-sailing.

The 3-blade propeller is available in diameters from 15” ~ 30+” , and pitch settings between 60% and 80% of the diameter. They are available in both LH and RH configurations for both saildrive and shaft installations. The GORI 3-blade propeller won the “DAME” design award at the Meets on November 1994 and the “HISWA” award in December 1994. In November 1994 the German Magazine “Die Yacht” published results of independent tests carried out by the Technical University of Berlin. These results showed conclusively the advantages of the GORI 3-blade propeller.

Ahead: GORI was 11+% more efficient than 3-blade feathering props tested.

Astern: GORI was 6.5+% more efficient than 3-blade feathering props tested.

Sailing: Drag was reduced by nearly 50% compared to the 3-blade feathering propeller under test.

The German sailing magazine “Segeln” tested propeller drag at the German Naval Architecture Test Center in Potsdam and results show the GORI 3 Blade propeller had less drag than all the other makes of 2-blades & 3-blades (except the GORI Race) with 1.4 Newton.

Gori Propeller 3 Blade Open

3-Blade Standard Shaft

Diameter Pitch Range Rotation Shaft Dia. to ~ 1.125 | to ~ 30mm Shaft Dia. 1.25 ~ 1.375 | 30mm ~ 35mm Shaft Dia. 1.50 ~ 2.00 | 38mm ~ 50mm Shaft Dia. 1.75 ~ 2.50 | 45mm ~ 60mm
15 9 to 12 RH ~ LH
16.5 10 to 13 RH ~ LH
18 11 to 14 RH ~ LH
20 12 to 16 RH ~ LH
22 13 to 17 RH ~ LH
24 15 to 19 RH ~ LH
26 16 to 21 RH ~ LH
28 17 to 23 RH ~ LH
30 18 to 24 RH ~ LH

3-Blade Saildrive

Diameter Pitch Rotation
15 9 to 12 RH ~ LH
16.5 10 to 13 RH ~ LH
18 11 to 14 RH ~ LH
19/20 12 to 16 RH ~ LH

GORI 3-Blade Measurement Table

Gori-3-blade-Measurement-Table

Propeller and Shaft Clearance Dimensions

sailboat folding propeller

A. Shaft Diameter B. Aft end of cutlass to start of taper/forward edge of hub E. Shaft centerline to hull at forward edge of hub F. Shaft centerline to hull at end of shaft thread H. End of shaft to leading edge of rudder I. Start of taper/forward edge of hub to rudder

Download Propeller and Shaft Clearance Form

Saildrive Installation

Please read these instructions carefully before installing your new GORI propeller

3bladeSailDrive

Warning ~ do not remove the blades from the blade housing when installing or removing the propeller from the shaft!!!! To remove blades – the center Fixing Bolt “MUST” be removed first!!!!

Installing the propeller.

The propeller is delivered assembled. This ensures that at the factory the propeller has been checked, and balanced prior to shipping.

Take apart the retaining cap (1). To do this … First remove the 3 x allen head bolts (item #5) holding the retaining cap (1) in place.

Now undo the retaining cap using the C-Spanner (16). The thread on the blade housing assembly (6), is a standard right to tight and left to loose. You may use a hammer with care, to tap the C-Spanner to get the retaining cap started as it is a firm, tight fit.

You will now have the retaining cap and blade housing assembly (6), (with blades installed) separate.

Check the shaft nut (3) & the nut-locking bolt (4.1) with the output shaft threads.

Remove the inner hub (2), flexible bushing (2.2), and PEEK bushings (2.1-2.3) from the blade housing (6).

Slide the retaining cap (1), PEEK bushing (2.1), inner hub (2), flexible bushing (2.2), and PEEK bushing (2.3) on to the saildrive shaft, matching the splines on the output shaft with those in the inner hub (2). Smear splines & shaft with waterproof lubricant.

Fit the nut (3), and tighten. Typically 72ft/lb. of torque for 1.00” dia. shaft. It is very important to always use the Gori supplied propeller nut for the installation. An incorrect nut can lead to loss of the propeller, part of the propeller or cause an electrical connection between the propeller and the saildrive.

Smear locking glue (Loctite 243) on the thread of the nut-locking bolt (4.1). Place the washer (4) into the shaft hut and then thread the nut-locking bolt (4.1) using a 5mm allen key (19). Typically tighten to 10 ft/lbs of torque.

Slide the complete blade housing assembly (6 thru 17.1), onto the flexible bushing (2.2), so that the 2 x security cams slide into the grooves of the flexible bushing (2.2). Wet the bushing to allow it to slide in easily.

Continue to slide the blade housing onto the assembly until the thread of the retaining cap (1), and the blade housing (6) are touching. Smear a threads with waterproof lubricant.

Screw the retaining cap (1) RH or clockwise onto the blade housing assembly (6). Using the C-spanner (16) tighten until the 3 x holes in the retaining cap are aligned with the 3 x half circle cutouts in the blade housing assembly.

Now using the Loctite-243 (21), re-install the 3 allen head bolts (5) using the 5mm allen key (19), into the holes and tighten firmly. Check that the blades will move freely from fwd to reverse and that the tip clearance with the hull is 10% of the blade diameter.

Removing the propeller

Warning ~ DO NOT remove the blades from the blade housing when removing the propeller from the saildrive leg.

First remove the 3 x allen head bolts (5), from the retaining cap

Now using the C-Spanner (16), undo the retaining cap so that it separates from the blade housing assembly (6). This is a right hand thread… simple right is tight…left is loose.

Carefully remove the blade housing assembly, by pulling off from the flexible bushing (2.2) and inner hub (2). These two items along with the bushings (2.1-2.3) will remain on the output shaft

Unscrew the nut-locking bolt (4.1) and also remove the washer (4) using a 5mm allen key (19).

Unscrew the shaft nut (3). It will be necessary to lock the output shaft when undoing the nut

Pull the inner hub (2), flexible bushing (2.20, end bushings (2.1 & 2.3), and retaining cap (1) off the output shaft.

Replacing the Aft Zinc

This should be done if more than 50% of the zinc (7), has been eroded away.

Undo the allen head bolt (8) and remove the old zinc (7) … if not gone completely.

Clean the propeller so as to ensure a clean strong bond with the new zinc.

Replace the zinc with new zinc, align the zinc with the end of the hub & the alignment hole with the pin in the end of the hub.

Use the new allen head bolt supplied … smear with loctite 243 also supplied, before re-installing the new bolt. Check that the blades will swing freely from fwd thru to reverse. If not and there are tolerance issues it may be necessary to realign or lightly file the sides of the zinc.

Replacing the Fwd Collar Zinc

This should be done if more than 50% of the zinc (17), has been eroded away.

First remove the 4 x allen-head bolts (17.1) and remove what is left of the zinc

Clean the surface of the propeller hub to ensure a good clean contact between the hub and the new zinc

Install the new zinc (17) using the Loctite 243 (supplied) on each of the 4 x allen-head bolts.

Replacing Flexible Stops

These can be replaced without removing the blades. Using a flat screw driver … pry out the old or worn Flexi-stops (15). Push or tap the new flexi-stops in place. It may be necessary to swivel the blades open and closed to obtain the best angle for re-installing the new ones. Remember they are flexible.

Removal of blades from the Blade Housing

To remove blades – the center Fixing Bolt “MUST” be removed first!!!! This must only be done when cleaning and a full service of the propeller is required. NOTE: Blades are not removed for the installation and removal of the propeller

Remove the zinc centre bolt (8) and the zinc anode (7), using a 5mm allen key (19). On propellers 18.0” and larger it will also be necessary to remove the threaded pin (9) using a 6mm allen key (20) … then remove the fixing bolt (10) using a 5mm allen key (19).

Failure to remove all these pins(8-9-10) first, will result in damage to the internal threads of the blade pins (11).

Disassemble the blade pins (11 & 11.1) from the blade housing using a 6mm allen key (20). Note that blades, pins and the housing are matched and numbered. They should only be reassembled in the correct location … that is #1 – # 2 – # 3.

Remove the blades. Remove the gear-wheel (13) and the spacer (14). Remove the flexible stops (15) using either a flat blade screw driver or pliers.

When re-mounting the blades and gears to the housing it is important to apply loctite-243 to … blade pins (11 +11.1), lock pin (10), threaded pin (9), fixing bolt (8).

The lock bolt (10) and the fixing bolt (8) are the very last items to be reassembled.

Be sure that all components fit back together and that the blade pins (11) are located as before removal, as they are indexed inside the hub to lock bolts (10 +8).

Note: If more than 50% of either of the zincs (7-17) has been eroded away they should be replaced. If the gear wheel (13) has been damaged or worn…it should be replaced If the flexible stops (15) have been damaged or worn…they must be replaced.

– Do not start the engine while the boat is out of the water – The prop may have sharp edges… be careful not to cut yourself – Make sure the blades do not open or close suddenly and trap your fingers – Stop the engine before diving or swimming in the vicinity of the boat – Propeller blades can cause considerable damage when rotating … be careful. – Do not remove fish nets, rope or similar from the prop with the engine running. – Check that the prop works in both fwd and reverse before each trip. If any strange sounds or vibrations are noticed coming from the propeller stop the engine and investigate the reasons/solve the problem.

Download GORI 3 Blade Saildrive Installation Maintenance Instructions

Gori3BladeStandardInstall1

The propeller is delivered assembled. This ensures that at the factory the propeller has been checked, and balanced before shipping.

If your propeller has a fwd collar zinc installed, remove this first (22 + 23) Take apart the jacket (1) from the blade housing (6).

First remove the 3 x allen head bolts (5) holding the jacket (1) in place. If supplied with a fwd collar zinc remove this zinc first.

Now undo the jacket using the C-Spanner (16). The thread on the blade housing assembly is a standard right to tight and left to loose. You may use a hammer with care, to get the jacket started as it is a firm fit.

You will now have the jacket and blade housing (with blades installed) and the hub cone (2) separate.

Check the fit of the hub cone (2) onto the shaft. Adjust the key if necessary.

Check the shaft nut (3) with the shaft threads.

Slide the jacket (1) onto the shaft first. Now slide the hub cone (2) onto the shaft and tighten the shaft nut (3) very tightly. Typically up to 72ft/lbs of torque

Cover the allen screws (4) with Loctite-242 and tighten these dog point allen screws into the hub cone (2), locking the shaft nut(3), firmly in place. To do this you will need to rotate the jacket to line up an access hole with the allen screws (4).

Slide the blade housing assembly onto the hub cone (4), making sure that the tabs engage the hub cone. Push it fwd until you can start the thread of the jacket (1).

Tighten the jacket (1) to the blade housing assembly. Use the C-Spanner (16) to tighten and align the 3 threaded holes (5) with the holes in the jacket.

Now using Loctite-242, re-install the 3 allen head bolts (5) into the holes and tighten firmly.

Check that the blades will move freely from fwd to reverse.

Warning ~ do not remove the blades from the blade housing when removing the propeller from the shaft

First remove the Fwd split collar zinc, then the 3 x allen cap head bolts (5), from the jacket.

Now using the C-Spanner, place it on the stb side, & hammer down, unscrewing the jacket so that it separates from the blade housing and push it fwd on the shaft.

Carefully remove the blade housing assembly by pulling straight aft.

Undo the allen screws (4) to allow removal of the shaft nut (3). It is not necessary to remove them completely from the Hub cone (2).

Unscrew the shaft nut (3)

Install the bronze puller (17) into the hub cone (2). Thread it in all the way.

Tighten the large bolt in the centre of the puller (17) and this will draw the hub cone off of the shaft.

This should be done if more then 50% of the zinc (7), has been eroded away.

Undo the allen head bolt (8) and remove the old zinc (7) … if not gone completely. Clean the contact area.

Replace the zinc with a new one … index the fwd end of zinc with the end of the hub pin to the zinc hole.

Use the new allen head bolt supplied … smear with loctite before re-installing the bolt.

First remove the 4 x allen-head bolts and remove what is left of the zinc

Install the new zinc using the Loctite (supplied) on each of the 4 x allen-head bolts

These can be replaced without removing the blades.

Using a flat screw driver … pry out the old or worn Flexi-stops (15)

Push the new flexi-stops in place. It may be necessary to swivel the blades open and closed to obtain the best angle for re-installing the new ones. Use the blades to “push” home the stop into its location hole. Remember they are flexible.

Removal of blades from the Blade Housing !!!

This must only be done when cleaning and full service of the propeller is required.

Blades are not removed for the installation and removal of the propeller

Remove the centre bolt (8) and the zinc anode (7), using a 5mm allen key (19).

On propellers 18.0” and larger it will also be necessary to: remove the threaded pin (9) using a 6mm allen key … then remove the lock bolt (10) using a 5mm allen key.

Failure to remove these pins first will result in damage to the internal threads of the blade pins (11).

Disassemble the blade pins (11 & 11.1) from the blade housing using a 6mm allen key. Note that blades, pins and the housing are matched and numbered. They should only be reassembled in the correct location … that is #1 – # 2 – # 3.

Remove the blades.

Remove the gear-wheel (13) and the spacer (14).

Remove the flexible stops (15) using either a flat blade screw driver or pliers.

When re-mounting the blades and gears to the housing it is important to apply loctite-242 to … blade pins (11 +11.1), lock pin (10), threaded pin (9), fixing bolt (8).

Be sure that all components fit back together and that the blade pins (11) are located as before removal as they are indexed inside the hub to lock bolts (10 +8).

– Do not start the engine while the boat is out of the water – The prop may have sharp edges… be careful not to cut yourself – Make sure the blades do not open or close suddenly and trap your fingers – Stop the engine before diving or swimming in the vicinity of the boat – Propeller blades can cause considerable damage when rotating … be careful. – Do not remove fish nets, rope or similar from the prop with the engine running. – Check that the prop works in both fwd and reverse before each trip. – If any strange sounds or vibrations are noticed coming from the propeller stop the engine and investigate the reasons/solve the problem.

Download GORI 3 Blade Standard Shaft Installation Maintenance Instructions

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Model of Interest:  2-Blade 3-Blade 3-Blade Single Pitch 4-Blade Race Series All Models

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Prop Installation Type:

sailboat folding propeller

1. P Bracket Strut 2. Shaft Log 3. Aperture 4. Saildrive

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Shaft Diameter:     Prop Diameter:     Pitch:    

# of Blades:   Right Hand Left Hand

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Pros and Cons of Folding Propellers:Avoid J Props

sailboat folding propeller

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I am starting this thread for two reasons. My utter disappointment in my feathering propeller, J Prop , and "Buyer Beware" of performances gained and lost when putting on a folding/feathering propeller. Folding/Feathering Propellers are expensive. Average price is anywhere from $2-3000 plus haul out and install. Most require that you cut the shaft at the end of the threads. If you ever want to go back to your old propeller you will need to buy a new shaft. There are many reasons why a sailor would consider putting on a folding propeller. Performance enhancement while sailing and reverse operations. These two enhancements are what all the salespersons who sell folding propellers tell you. What they don't tell you is the other side of the story: motoring. Most if not all folding propellers lose power, the ability to propel your boat as fast as your fixed propeller. How much is lost will depend type of boat. For racing boats, they don't care because they are not using the motor much except to get in and out of the dock. Racing boats want the least amount of drag so most go with a 2 bladed folding propeller. Same can be said with most sailors that just daysail their boats but desire more performance while sailing. Cruising Sailboats - Those sailors that are full-time/part-time cruising, and/or with heavy displacement boats and need all the performance they can get while motoring should consider not putting on a folding/feather propeller. Major power losses of up to 1-2 knots could result in putting on one of these propellers. With my J Prop I have seen losses of up to 2 knots. So one would ask, "Why would I care about loss of power while motoring"? Several reasons. The obvious is you are going slower and need to get somewhere. A lost of 20%-30% of your boat speed is serious business. That is a lot of lost horsepower. Second reason, big seas and big wind. You will need that horsepower to overcome these. Backsliding down a wave front is not fun and very dangerous. This happened to me in St Augustine Inlet. We almost broached. This happened on a 7' breaking wave. I didn't have the horsepower to get up and over. So lets look more closely at why a feathering/folding propeller losses horsepower. Simply, flatter blade design. They need a flatter blade design vs a fixed propeller to do what they do best; fold/feathering. With a flatter blade design each blade cannot produce thrust at the same RPM as your fixed blade can. Since sailboats have very slow RPM's vs a motorboat, our blades need more camber to produce the required thrust to move our sailboats. The same analogy as sailing with little wind vs high winds, we need more camber out our sails in light air conditions: Slower RPM =light winds requires more camber. To get the same about of horsepower in a folding/feathering propeller you need to get more surface area somehow: usually a bigger size propeller. Most sailboats do not have the clearance to do this. One has to be very careful here and not get the blades to close to the underside of the sailboat to prevent cavitation. In summary, the pros of a folding/feathering propeller, less drag while sailing and better reverse performance when docking (no or little prop walk) Cons: loss of horsepower while motoring and expense. The big question: Is gaining .25-.5 knots sailing at certain wind speeds and angles worth the loss of 1-2 knots of motor speed? For me a fulltime cruiser, NO. A big mistake on my part or I just bought the wrong feathering propeller.  

sailboat folding propeller

Melrna said: I am starting this thread for two reasons. My utter disappointment in my feathering propeller, J Prop , and "Buyer Beware" of performances gained and lost when putting on a folding/feathering propeller. Folding/Feathering Propellers are expensive. Average price is anywhere from $2-3000 plus haul out and install. Most require that you cut the shaft at the end of the threads. If you ever want to go back to your old propeller you will need to buy a new shaft. There are many reasons why a sailor would consider putting on a folding propeller. Performance enhancement while sailing and reverse operations. These two enhancements are what all the salespersons who sell folding propellers tell you. What they don't tell you is the other side of the story: motoring. Most if not all folding propellers lose power, the ability to propel your boat as fast as your fixed propeller. How much is lost will depend type of boat. For racing boats, they don't care because they are not using the motor much except to get in and out of the dock. Racing boats want the least amount of drag so most go with a 2 bladed folding propeller. Same can be said with most sailors that just daysail their boats but desire more performance while sailing. Cruising Sailboats - Those sailors that are full-time/part-time cruising, and/or with heavy displacement boats and need all the performance they can get while motoring should consider not putting on a folding/feather propeller. Major power losses of up to 1-2 knots could result in putting on one of these propellers. With my J Prop I have seen losses of up to 2 knots. So one would ask, "Why would I care about loss of power while motoring"? Several reasons. The obvious is you are going slower and need to get somewhere. A lost of 20%-30% of your boat speed is serious business. That is a lot of lost horsepower. Second reason, big seas and big wind. You will need that horsepower to overcome these. Backsliding down a wave front is not fun and very dangerous. This happened to me in St Augustine Inlet. We almost broached. This happened on a 7' breaking wave. I didn't have the horsepower to get up and over. So lets look more closely at why a feathering/folding propeller losses horsepower. Simply, flatter blade design. They need a flatter blade design vs a fixed propeller to do what they do best; fold/feathering. With a flatter blade design each blade cannot produce thrust at the same RPM as your fixed blade can. Since sailboats have very slow RPM's vs a motorboat, our blades need more camber to produce the required thrust to move our sailboats. The same analogy as sailing with little wind vs high winds, we need more camber out our sails in light air conditions: Slower RPM =light winds requires more camber. To get the same about of horsepower in a folding/feathering propeller you need to get more surface area somehow: usually a bigger size propeller. Most sailboats do not have the clearance to do this. One has to be very careful here and not get the blades to close to the underside of the sailboat to prevent cavitation. In summary, the pros of a folding/feathering propeller, less drag while sailing and better reverse performance when docking (no or little prop walk) Cons: loss of horsepower while motoring and expense. The big question: Is gaining .25-.5 knots sailing at certain wind speeds and angles worth the loss of 1-2 knots of motor speed? For me a fulltime cruiser, NO. A big mistake on my part or I just bought the wrong feathering propeller. Click to expand...

sailboat folding propeller

Been very happy with 3 blade max prop on current outbound and prior PSC 34. Have heard "not so much" with 4 blade version. Although burned 106g going and 100g coming back from Carribean would note we sail not power 95% plus of the time over the course of a year. So yes that 1/2 to 1 kt. sailing is a very big deal. We will turn on the engine when VMG goes below 5kts. So again that 1/2-1 kts.. is a big deal. Respectfully disagree with you on that point.  

sailboat folding propeller

I have to go with the two gentlemen above.. our 3 blade MAX has in no way impacted our performance under power except for the better, and under sail performance is much better indeed. It's hard to imagine why you've been so affected. Your point about needing to modify the shaft has some validity.. though I think I could still mount my old fixed 3 blade but couldn't 'double nut' it anymore.  

I've also had excellent luck with MaxProps on my last 2 boats. Lot's of power to push through a seaway, and absolutely excellent reverse. Never had a problem in 17 years, and would recommend them.  

Mainsail - I have talked to Stan many times on our issue. I have gotten nowhere. The prop has been professionally installed and the pitch has been matched with the engine RPM's. Took 4 times (read Haul Out) to get the right settings due to Stan initial miscalculations.  

The beauty of resetting the pitch on this J prop was one of the reasons for selecting it in the first place, say over a Max Prop. However, resetting in the water while easy enough before the lock ring is placed can be dicy in poor visibility and cold water. The ease of maintenance is the other. So we are in agreement on this. I am just not getting the performance out of it as I guess you are. We are southbound right now on the ICW. We are only getting 6.2 vs 7.8 knots our normal cruising speed. We get full RPM's on the engine (3000) per Yanmar and J prop and the propeller is clean. When talking with Stan he finally admitted to me at the boat show about the lose of performance due to the flat blades of this particular propeller.  

sailboat folding propeller

I had a 3 blade MaxProp feathering prop on my last boat and have a 3 blade Flex-O-Fold folding prop on my current boat. On both boats I didn't have any lost of speed under power! The big difference to me is the the F-O-F prop seems a lot more efficient that the Maxprop (and I haven't been able to tell the difference between them in reverse and think that is just a wive's tale). But to me a major PRO to getting a feathering or folding prop is so you don't have to listen the the shaft spinning when sailing!!!!!!  

Four blade Max Prop is a great prop. I have done a lot of prop testing, using the same boat. Very interesting experiments. One thing all the props we tested had in common was the ability to drive the boat at hull speed. We did not have J Prop to test or a F-O-F. They were not available then. Kiwiprop gets good reviews. I have a buddy who has one and he loves it. It's rather inexpensive.  

This thread reminded me that I still have a Max 17" 1 1/4 shaft 3 bld Nearly new but the lug in the hub is sheared off (drift wood) Apparently it's fixable in Seattle. Any one interested, make an offer.!!  

I bought our Max used, also 17' X 1.25 shaft.. but the shaft taper was different. For $400 PYI made me a new hub. Good quick service too!  

sailboat folding propeller

2nd the KIWI. Love ours. IFIRC it was about $1500. The other prop I was considering at the time was a Flexefold. That estimated out at $3700. Figured the KIWI was worth the gamble. Great prop. Jim  

sailboat folding propeller

Any down sides? Loss of top end performance? Same or different rpm to reach hull speed? Sent from my SAMSUNG-SGH-I537 using Tapatalk  

I was running a business so easy to absorb the expense of a Max and allowing my old gaffer the bonus of fabulous speed under sail was a no brainer But I pranged a big bronze prop (ice) in Tuk and was glad I could heat (tiger torch) and bang it back to perfect. while I hung from a 500 ton crane (connections at Dome) If off the beattin track (Like north of Lund)no way would I go for the delicate whirring thing.  

I'm another fan of MaxProp. Service is great too. I had a nick out of a leading edge, so sent it back over the winter. While repaired, the entire prop looked brand new! I'm sure we get some sort of sail speed advantage, but I can't say how much. I hate hearing the shaft spinning on a fix prop in neutral, especially when I go down below. I can't really tell if something is wrong, if it's always making a racket. It's also hard for me to say, if I lose speed under power. I don't feel like I do. I run about 60-70% of max rpm and get speed about a half to a full knot below hull speed at those power settings. Seems reasonable. Obviously, I could juice it up to 80%, but I don't think the fuel burn is worth it and these power setting push me along at around 8 kts. I believe Max Prop now also sells a prop, whose pitch is adjustable without disassembly.  

sailboat folding propeller

Minnewaska said: I believe Max Prop now also sells a prop, whose pitch is adjustable without disassembly. Click to expand...

Minn: Yes they do but I'm not sure if that feature is available on all models. We are using the five blade on the new Pacific Seacraft 63.  

sailboat folding propeller

I like my 3-bladed Max Prop, which replaced my old 2 bladed fixed prop. Motoring performance is about the same. Took two tries to get the pitch right. Happy customer  

sailboat folding propeller

I'm happy with my 25 year old, 3-bladed MaxProp. I do a lot direction reversals waiting for 2 drawbridges between my dock and open water and it has never failed. The gearing is solid, although the blades are thin. Without cupping, the blades have to be less efficient going forward, but that is a two-edged sword, as the reverse thrust is incredible. Helps when maneuvering in tight quarters. I once winched up a concrete block on its polypropylene line that wrapped on the prop. The engine stalled and I was left with all 3 blades ripped and dog-eared. PYI fixed it for somewhere in the $400+ range. Some years later, I had PYI rebuild the prop by "plating" the blades (that had pitted over the years) and recreating the original shape. PYI also tightened up the fit of the parts. That was more $$, but the result looked like a new prop for far less money than a replacement. Bottom line: The MaxProp is a great product and PYI provides incredible customer support--both over the phone and in their shop. Yes, I would recommend it to a friend.  

sailboat folding propeller

Melrna said: What they don't tell you is the other side of the story: motoring. Most if not all folding propellers lose power, the ability to propel your boat as fast as your fixed propeller. How much is lost will depend type of boat. Cruising Sailboats - Those sailors that are full-time/part-time cruising, and/or with heavy displacement boats and need all the performance they can get while motoring should consider not putting on a folding/feather propeller. Major power losses of up to 1-2 knots could result in putting on one of these propellers. With my J Prop I have seen losses of up to 2 knots. In summary, the pros of a folding/feathering propeller, less drag while sailing and better reverse performance when docking (no or little prop walk) Cons: loss of horsepower while motoring and expense. The big question: Is gaining .25-.5 knots sailing at certain wind speeds and angles worth the loss of 1-2 knots of motor speed? For me a fulltime cruiser, NO. A big mistake on my part or I just bought the wrong feathering propeller. Click to expand...
Melrna said: I am starting this thread for two reasons. My utter disappointment in my feathering propeller, J Prop , and "Buyer Beware" of performances gained and lost when putting on a folding/feathering propeller.....In summary, the pros of a folding/feathering propeller, less drag while sailing and better reverse performance when docking (no or little prop walk) Cons: loss of horsepower while motoring and expense. Click to expand...

There was ONE guy in Seattle who would adjust a Max Prop with the boat in the water. One guy.  

One guy could handle the amount of business we're talking about, I guarantee.  

sailboat folding propeller

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Ceiling Roof Vehicle

Looks cool, but I don't see either the avoidance of complexity or the retention of reliability there. MedSailor  

Sounds cool. Would definitely avoid the snagging of lines and nets.  

Newfie dorrys have done that since engines were invented (sort of a long center board slot at the stern. )helps when hauling up a rocky beach.  

For under powered boats you can't beat Autoprop. It finds the maximum torgue for that RPM.  

Really? Care to explain how a prop finds the maximum torque at a given RPM? Most sailboats are underpowered from the perspective of today's motorboat design. OTOH most boats having an engine is overpowered from the perspective of being able to drive the boat (in particular from a theoretical point of view, ie flat water ...). Thus the "underpowered" view doesn't say anything. However, Autoprop is known. Works fine in some deployments - but of course not always. There are more important factors than "underpowered". Shaft angle is one ... /J  

sailboat folding propeller

I have had the KIWI prop for 7 years, If I get a new boat I will look at fitting a KIWI to it. The only down side is reverse......it is severe, I would like the manufacturers to fix this issue as it is the only negative. My perkins 4108 cant get past 1200 rpm in reverse. entering my slip and selecting reverse is like pulling on the hand brake.  

Really? Care to explain how a prop finds the maximum torque at a given RPM? I wish I could. But at the Club we have a cat ketch that is very underpowered. The owner is a shipwright. This boat has worn all the props, without success. But with the Autoprop, it outperforms all the others. "It outperforms all the others, in all aspects." As a commercial pilot, the blade design is quite unusual. On sailboats I've seen props that were cast backwards, and sold with long production runs.  

Kiwi: The only down side is reverse......it is severe, YES  

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Category : Kratovo, Russia

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Looking at the profile or at the cross-section of our shaft propellers at Flexofold, you will see a powerful shape that converts more horsepower into thrust than any other propeller. Twin-helical gears between the blades ensure synchronized opening and folding of the blades, while the well designed and slim propeller hub provides a very low drag configuration.

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Gori Folding propellers are very high quality - thoroughly tested by thousands of sailors all over the world - for cruising as well as racing. Available in sizes from 11" to 20" diameter for shaft as well as saildrive installation. The 3-blade Gori folding propeller "overdrive" function adds a new dimension to sailing under power. The "overdrive" gives the same speed at lower rpms. The result is less engine noise, less vibration and better fuel economy. If you do not see what you are looking for, or are not sure what you need, please call us at 866-790-7767 or email us at [email protected]

Gori 2 Blade Sailboat Propeller 11.5 X 08

Gori 2 Blade Sailboat Propeller 11.5 X 08

11.5 X 08 Gori 2 Blade folding Propeller fits Volvo & Yanmar Saildrives & Shaft diameters 3/..

Gori 2 Blade Sailboat Propeller 11.5 X 9.5

Gori 2 Blade Sailboat Propeller 11.5 X 9.5

11.5 RH 9.5 Gori 2 Blade folding Propeller fits Volvo & Yanmar Saildrives & Shaft diamet..

Gori 2 Blade Sailboat Propeller 12.5 RH 08

Gori 2 Blade Sailboat Propeller 12.5 RH 08

12.5 RH 08 Gori 2 Blade folding Propeller fits Volvo & Yanmar Saildrives & Shaft diamete..

Gori 2 Blade Sailboat Propeller 13" X 09

Gori 2 Blade Sailboat Propeller 13" X 09

13" X 09 Gori 2 Blade folding Propeller fits Volvo & Yanmar Saildrives & Shaft diameters 3/4..

Gori 2 Blade Sailboat Propeller 14" X 9.5

Gori 2 Blade Sailboat Propeller 14" X 9.5

14" X 9.5 Gori 2 Blade folding Propeller fits Volvo & Yanmar Saildrives & Shaft diameters 3/..

Gori 2 Blade Sailboat Propeller 15"

Gori 2 Blade Sailboat Propeller 15"

15" Gori 2 Blade folding Propeller fits Volvo & Yanmar Saildrives & Shaft diameters 3/4" thr..

Gori 2 Blade Sailboat Propeller 16.5"

Gori 2 Blade Sailboat Propeller 16.5"

16.5" Gori 2 Blade folding Propeller fits Volvo & Yanmar Saildrives & Shaft diameters thru 1..

Gori 2 Blade Sailboat Propeller 18"

Gori 2 Blade Sailboat Propeller 18"

18" Gori 2 Blade folding Propeller fits Volvo & Yanmar Saildrives & Shaft diameters thru 1 3..

Gori 3 Blade Sailboat Propeller 15"

Gori 3 Blade Sailboat Propeller 15"

Gori Folding Propeller for Volvo Penta and Yanmar and Shaft drives SAE and Metric.The Gori folding p..

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Gori 3 Blade Sailboat Propeller 16.5"

Gori Folding Propeller fits Volvo Penta, Yanmar and Shaft drive SAE or Metric applications.The Gori ..

Gori 3 Blade Sailboat Propeller 18"

Gori 3 Blade Sailboat Propeller 18"

Gori Folding Propeller for Volvo Penta, Yanmar and Shaft drive applications SAE or Metric.The 3-blad..

Gori 3 Blade Sailboat Propeller 20"

Gori 3 Blade Sailboat Propeller 20"

Gori Folding Propeller for Volvo Penta, Yanmar and Shaft Drive applications - SAE or Metric.The 3-bl..

Gori Propeller 2 Blade Racing 375mm

Gori Propeller 2 Blade Racing 375mm

Gori Folding Sailboat Propeller - 375mm (14.7" diameter) RH 260mm (10.2 pitch) Racing Propeller.Gori..

Gori Propeller 2 Blade Racing 380mm

Gori Propeller 2 Blade Racing 380mm

Gori Folding Sailboat Propeller - 380mm (14.9" diameter) LH 265mm (10.4 pitch) Racing Propeller.Gori..

Gori Propeller 2 Blade Racing 425mm

Gori Propeller 2 Blade Racing 425mm

Gori Folding Propeller 425mm (16.7" diameter) X 300mm (11.8 pitch) Gori Racing Propeller.Gori Prop 2..

Gori Propeller 2 Blade Racing 450mm

Gori Propeller 2 Blade Racing 450mm

Gori Folding Propellers - 450mm (17.7" diameter) X 330mm (12.9 pitch) Gori Racing Propeller.Gori Pro..

Gori Propeller 2 Blade Racing 475mm

Gori Propeller 2 Blade Racing 475mm

Gori Racing Propellers - 475mm (18.7" diameter) X 330mm (12.9 pitch) Gori Folding Propellers.Gori Pr..

Gori Propeller 2 Blade Racing 530mm

Gori Propeller 2 Blade Racing 530mm

Gori Racing Sailboat Propellers - 530mm (20.8" diameter) X 375mm (14.7 pitch) Gori Prop.Gori Prop 2 ..

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  5. 3 Blade saildrive Folding Propellers for sailboats by Flexofold

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  4. Super easy instructions for folding a sailboat with paper

  5. Installation Guide T-MOTOR MFP folding propeller can be used in coaxial structure

  6. Sail Kit for WaveWalk Kayak "W" Boat Catamaran

COMMENTS

  1. Flexofold

    The most efficient folding propellers for sailboats and multihull yachts. Find shaft and saildrive folding propellers with 2, 3 or 4 blades here. See more. ... Get a specified propeller recommendation for your sailboat. Our folding propellers are available as 2-bladed, 3-bladed, and 4-bladed in multiple sizes and pitches. ...

  2. 2-blade, 3-blade and 4-blade folding propellers for all sailboats

    It depends on which sailboat you have, the engine model, the gear ratio and last but not least - your personal preferences! That is why we have a dedicated team of experts to calculate the optimal propeller for your needs whether it is a 2-, 3- or even a 4-bladed folding propeller the precise calculation will tell you which propeller, size and ...

  3. AB Marine

    GORI folding propeller has amassed a record and reputation unmatched throughout the world of propellers for cruising and racing. Call Us 401-847-7960 | [email protected]. ... Our boat's prop-walk-to-port drove us into neighboring boats until we changed to your 3-blade folding propeller. Now we can easily and safely power in reverse to ...

  4. Flexofold Propellers for Sale

    Flexofold develops, manufacture and sell the markets most efficient folding propellers for sailboats and multihull yachts. Flexofold Sailboat Propellers are available as 2-Blade, 3-Blade and 4-Blade in multiple sizes and pitches. If you do not see what you are looking for, or are not sure what you need, please call us at 866-790-7767 or email ...

  5. Sailboat Propellers for Sale

    Shop Sailboat Propellers now at Get A Prop. Largest Selection Online. Choose from Fixed or Folding Sail Boat Propellers. 40 Years Experience. Blog; 866-790-7767; Quick Message; 8142 S. March Point Road. Anacortes, WA. 98221 USA; ... Sailboat Propellers, Fixed, Folding, Feathering

  6. 2-blade and 3-blade Saildrive Folding Propellers for sailboats

    It's not too late! Get a new folding propeller before the boat goes into the water. If you are fast, we will send your new propeller within 3-5 working days. Whether you need a 2-blade saildrive propeller, a powerfull 3-blade propeller, or the new Composite propeller - Flexofold has the correct folding propeller.

  7. Folding Propellers

    The 3-blade GORI Folding Propeller is the only folding propeller operating the same pitch in forward and in reverse. This is a techno­logical and functional leap forward in the development of sailboat propellers. Gain the folding propeller's speed advantages under sail, and the fixed propeller's thrust capability when motoring.

  8. Folding Sailboat Propellers

    Expect delivery within 7-10 Day's. The Flexofold Folding Sailboat Propeller is the most efficient, lowest drag propeller you can buy. This claim is based on independent tests conducted over the past several years and reinforced today by sailboat builders and owners around the world. Flexofold Propellers deliver: • Maximum performance under ...

  9. 3-Blade Folding Propeller

    3-blade Gori Folding Propeller Combining minimum drag under sail with maximum thrust while motoring The 3-blade Gori Folding Propeller marks a technological and functional leap forward in the development of propellers for sailboats. It is the only folding propeller operating the same pitch in forward and in reverse, the blades pivot 180 degree.

  10. Folding sailboat propeller

    The Varifold 3 blade folding sailboat propeller is available in diameters from 16″ to 25″ for engines rated up to 350 HP and is a very affordable option for those looking to take advantage of optimizing their propulsion system for sailing. The folding 3 blade propeller is available in 2 versions, the first can be mounted on a conventional ...

  11. 2 Blade shaft Folding Propellers for sailboats by Flexofold

    The 2-Blade Flexofold Folding Propeller offers effortless handling and powerful thrust in both forward and reverse. Especially known for its minimal drag when folded, it ensures faster sailing, even in light winds, with almost no risk of catching debris or seaweed. Cruisers and racers alike choose this propeller for its use of the most ...

  12. Folding sailboat propeller

    The Varifold 4 blade Propeller is available in diameters from 18″ to 48″ for engines rated up to 1000 HP. The folding 4 blade propeller is available for diameters between 18″ and 25″ on a conventional shaft known as the VF-120 For propeller diameters between 26″ and 32″ the model is the VF-160. For larger diameters between 36″ and ...

  13. Gori 3-Blade Folding Propeller

    The GORI 3-blade folding propeller is available for installation on vessels with engines from around 10BHP to 300+BHP. This unique design offers an "overdrive feature", with 2 controlled pitch settings in forward and full reverse thrust. The "overdrive feature" gives lower engine RPM for the same cruising speed when in calm waters or ...

  14. Pros and Cons of Folding Propellers:Avoid J Props

    One has to be very careful here and not get the blades to close to the underside of the sailboat to prevent cavitation. In summary, the pros of a folding/feathering propeller, less drag while sailing and better reverse performance when docking (no or little prop walk) Cons: loss of horsepower while motoring and expense.

  15. 6 Trolling Motor Accessories You May Need

    Having a spare prop in the boat is a cheap insurance policy to make sure that an unexpected impact doesn't mean the end of a fishing day. In the unlikely case of damage, Minn Kota props can be changed out on the water quickly and easily with simple hand tools.

  16. Category:Kratovo, Russia

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  17. 4 Blade Shaft Folding Propellers for sailboats by Flexofold

    A powerful hydrodynamic design that ensures efficiency. The 4-blade Flexofold folding propeller provides trouble-free handling and superior power in both forward and reverse. The powerful hydrodynamic design provides efficient use of the engine. Despite the relatively large propeller and 4 blades, the low drag makes your boat sail faster and ...

  18. Flexofold Folding 3 Blade Propellers

    The Flexofold Folding Sailboat Propeller is the most efficient, lowest drag propeller you can buy. This claim is based on independent tests conducted over the past several years and reinforced today by sailboat builders and owners around the world. Flexofold folding propellers deliver: • Maximum performance under power*

  19. Kratovo Map

    Kratovo is an urban locality in Ramensky District of Moscow Oblast, Russia, located 40 kilometers southeast of Moscow. Mapcarta, the open map.

  20. Slipstream Folding Propellers

    The Geared Folding Slipstream Propeller design keeps blades synchronized, allowing the blades to fold back properly regardless of the propeller position, even at low speeds - No crawling into the bilge to position the shaft when racing. Sizes from 14 to 18 inches diameter. If you do not see what you are looking for, or are not sure what you ...

  21. Best 15 Building Supplies in Kratovo, Moscow Oblast, Russia

    Search 323 Kratovo building supplies to find the best lumber or building supply company for your project. See the top reviewed local lumber and building supplies in Kratovo, Moscow Oblast, Russia on Houzz.

  22. 2 blade, 3 blade and 4 blade Shaft folding Propellers by Flexofold

    Shaft Propellers for Sailboats by Flexofold. Whether you need a 2-blade saildrive propeller for cruising or regatta sailing, a powerfull 3-blade propeller or a 4-blade to ensure hasslefree handling of your large yacht - Flexofold has the right propeller for you! Looking at the profile or at the cross-section of our shaft propellers at ...

  23. Gori Folding Propellers

    Gori Propellers. Gori Folding propellers are very high quality - thoroughly tested by thousands of sailors all over the world - for cruising as well as racing. Available in sizes from 11" to 20" diameter for shaft as well as saildrive installation. The 3-blade Gori folding propeller "overdrive" function adds a new dimension to sailing under power.

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