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Ben,
We replaced a fixed prop with a MaxProp on our previous cape Dory 36. You will find you lose about 5% efficiency in forward, due to the blades being flat rather than curved. On the other hand, efficiency in reverse will be much greated and there will probably be less prop walk, for the same reason.For what it’s worth, we replaced the fixed prop on our 424 with a Gori and love it, but it is expensive. Mostly we wanted a folding rather than feathering prop because of all the crab pot lines here in the Chesapeake.
Warren Stringer
s/v Adagio
Deltaville, VAHi Rich,
On Adagio, with a 135 jenny, the sheeting angle is limited by the spreaders rather than by the configuration of the lowers at deck level. So I think I could get away with it. It might be more of an issue with a smaller jib. There would not be a problem with mast support, shroud tension, or constraining the main boom by moving the lowers outboard.
I also wonder if by using a slightly smaller jenny, or putting maybe 3 or 4 turns on the roller furler, I would be able to sheet the jib inside the upper shroud but outboard of the lowers. I used to do this with the Yankee on my Cape Dory 36 cutter and gained about 10 degrees pointing ability with no sacrifice in speed (in calm water).
Food for thought. Have to look a little more at the geometry this weekend.
Warren
s/v Adagio, #149, 1981Has anybody ever thought about converting the main forward and aft lowers to external chainplates to get more room to pass by on deck?
Warren
s/v Adagio #149David,
Full disclosure – I’ve never actually done this with the sails up. But since you would be doing this in light winds, I would think you could just go head to wind, power in reverse to get a little sternway, then shift into forward and resume course. Maybe rolling up the jib would help, but you could just let the main and mizzen luff. I’ll try it next time I’m out, unfortunately, thunderstorms predicted on the Chesapeake this weekend.
Warren
David,
I sail with a three blade Gori. The overdrive does work and cuts engine rpm and fuel consumption by about 20% at cruising speed. But to engage it you have to power astern at about a knot, then shift into forward. You won’t get it if you simply start powering while you are sailing forward. Also, if your prop is pitched correctly, You will get no benefit and will overload the engine at full throttle.
Warren Stringer
s/v Adagio, # 149
Deltaville, VAHi Ryan,
I can’t help you with your options for sailmakers and materials, except to say that your mizzen and jib are your heavy weather sails, so choose your mizzen sailcloth with that in mind. For the same reason I would include at least one set of reef points in the mizzen.
Given running backstays on the mizen, there would be no reason not to use full length battens, unless this would create weather helm issues.
I have lazyjacks on both the main and mizzen; both have rings where the lines come together so that the lazyjacks can be lowered and looped around a hook on each side of the mast to keep them out of the way when sailing, or when the sails are furled. When we lower or reef the sail, they form a bit of a cage so that we can keep sailing without having to furl the sail or collect the bunt. A Dutchman will do the same thing, but will prevent you from setting up an awning over the boom.
Hope this helps.
Warren Stringer
s/v Adagio, P424#149Hi Ryan,
Be sure the boatyard knows where your propeller is and places the aft lifting strap behind it. This is particularly an issue if you have a folding prop – there is not a lot of wiggle room there. Ask me how I know!!
Warren Stringer
s/v Adagio
P424 # 149, 1981
On the hard in Deltaville, VAHi,
-Hull # 149
-Boat Name Adagio (ex Seabastian)
-Owner Name Warren and Carol Stringer
-email address wstringer8940@comcast.net
-HIN (starts with PEA59)
-Rig Ketch
-Current power plant Westerbeke W58
-USCG # (if applicable)
-Home Port Deltaville, VA
-Current Berth Location (or “Cruising”) Deltaville VA
-Year purchased 2012
-Website, Facebook page, Twitter, Instagram, etc. (if applicable)
-Any “unusual” features (e.g. L galley, single companionway, two head, added inner forestay, etc.) We have added a “mule” (main backstaysail) with a lightweight wishbone for use in light air. It adds about 120 sq.ft. of sail area, is self tacking, and usable on any point of sail. Still trying to figure out how best to set it and how much speed it adds.Have to get back to you with USCG # and HIN
Warren
1 user thanked author for this post.
Hi David,
It replaced a Yanmar torque limiter which had failed. This was a number of years ago, but as I remember things were a bit smoother. Don’t know if this was a function of the drivesaver or just removing the Yanmar device.Warren
s/v AdagioHi David,
You might want to look into a Drivesaver from Global Marine. It would give you the spacing and provides a breakaway joint between the shaft and the v-drive in case you wrap a line around your prop. I have one on my previous boat.
Warren
s/v AdagopDavid,
To fold it we just sail. Because of the way the blades fold I think even at minimum rpm in reverse the blades would partially open in the reverse configuration.
In “normal” forward it seems to work fine. In reverse, the blades still present the power face to the water. If you build up a little sternway, then gently slip into forward, the water pressure from moving astern keeps the blades open in the reverse configuration. They are now presenting the back side of the blade to the water when you shift into forward, but the back side has about 2 inches more pitch then in the forward configuration. Gori refers to this as the “overdrive” and at low to intermediate rpm it will give you about 20% more speed for a given rpm, or you can back down the rpm and maintain speed at about 20% better mileage. I’ve tested it, and it really works. But (assuming your prop is correctly pitched) you will not be able to maintain the 20% advantage at full rpm, and you will overwork the engine.
Warren
s/v AdagioDavid,
We replaced the fixed prop with a three blade Gori two years ago. What I did not expect was BETTER performance in reverse, but this has definitely been the case. There is more thrust and less prop walk. I think the reason is that the Gori presents the power face of the blade to the water in reverse, like a feathering prop but unlike any other folding or fixed prop. Because of the way the blades pivot, water pressure helps to hold the blades open in reverse, at least a little. The “overdrive” feature is handy too.
Warren
s/v Adagio
