C-025 Bisquit

[Bisquit]

Thanks. I'm running prop programs for the Yanmar 2GM20F I plan to install and everything says that the aperture is too small for the engine to have good efficiency. The 18hp is plenty to push the boat but the prop should be a 16 x 11. three blade. By my calculations I would have to increase the pitch to at least 15 - 16 to get the prop down to the required 13" for the existing aperture. What are people running?

[Commander 147]

You know these boats originally came with an Atomic 4 that ran wide open with a tiny 8" 2-blade prop. That is probably why the aperture for the prop is no larger than it is. I know you already have the engine but perhaps you could salvage an atomic 4 to put in her. Maybe not on your timeline however.


I have a friend who sails a Morgan 30 with an atomic 4 in it and he loves it. He can go to the auto parts store to buy any parts he needs.

[mbd]

Thanks. I'm running prop programs for the Yanmar 2GM20F I plan to install and everything says that the aperture is too small for the engine to have good efficiency. The 18hp is plenty to push the boat but the prop should be a 16 x 11. three blade. By my calculations I would have to increase the pitch to at least 15 - 16 to get the prop down to the required 13" for the existing aperture. What are people running?

My Ariel was repowered by a PO with a Yanmar 2GM:
Specs: Yanmar 2GM 13 HP @ 3400 RPM, 15 HP @ 3600 RPM
Trans: 2.62:1
Prop: 13x11

Some old threads about my brief history with a Yanmar including prop programs, emails from prop shops, and excellent advice from a previous forum member:
http://www.pearsonariel.org/discussi...Inboard-Issues
http://www.pearsonariel.org/discussi...7-Ideas-wanted

Bill of Periwinkle (A-231) would be a great resource if he is still checking in. He did a wonderful rehab on A-231 and repowered with a 20 HP diesel.
http://www.pearsonariel.org/discussi...231-Periwinkle

Great job on your refit and good thinking on saving the cockpit sole for last!

[Bisquit]

My Ariel was repowered by a PO with a Yanmar 2GM:
Specs: Yanmar 2GM 13 HP @ 3400 RPM, 15 HP @ 3600 RPM
Trans: 2.62:1
Prop: 13x11

Some old threads about my brief history with a Yanmar including prop programs, emails from prop shops, and excellent advice from a previous forum member:
http://www.pearsonariel.org/discussi...Inboard-Issues
http://www.pearsonariel.org/discussi...7-Ideas-wanted

Bill of Periwinkle (A-231) would be a great resource if he is still checking in. He did a wonderful rehab on A-231 and repowered with a 20 HP diesel.
http://www.pearsonariel.org/discussi...231-Periwinkle

Great job on your refit and good thinking on saving the cockpit sole for last!

Thanks for the info. I am sure I will be able to sort the prop issue. Is you prop a 2 blade or three blade?