SO 379 Fixed 3 Blade Propeller

[davegatt]

Hello All,

I am new to this forum. My name is David and I come from Malta. I recently bought a 2nd hand Jeanneau so 379 (2015). She is equipped with a 29HP Yanmar 3YM 30 engine and sail Drive SD25 with a gear ratio of 2.64. 


Since the day i bought the boat, i always felt that the boat is underpropped. She cruises at 6.5 knots at 3200 Revs. Now that she is on the hard, i have decided to remove the prop and take it to an engineer to get it sized ( since prop had no size on it) 


I am being told the the current prop is 16 x 11. 


Can other Jeanneau 379 owners provide advice as to what prop is the ideal prop for these boats?  The engineer recommended 17x 13 however before i proceed in buying one, it would be good if i can receive feedback from other owners.


Thank you  

[sitara]

Hi David, My SO36i arrived over propped, the engine (3YM30) would only rev out to 3200 under load. My local Yanmar agent was not happy and we fitted a new prop (Autostream feathering with adjustable pitch). The engine should be able to rev out to at least 3400-3500 under load in order to develop full power.

It is possible for prop specialists to alter the pitch of a fixed prop, so a new one may not be necessary. The feathering prop gave more speed and better pointing ability but at a slight cost in boat speed when motoring.

Cheers

Rob

[davegatt]

Hi Rob,

Many thanks for your reply. Would you know the size /pitch of the Original prop and the size / pitch that you have now?

Thank you
David