Cal 29 prop

Waltthesalt · #1 (**permalink**) 09-22-2009

Has anyone installed a 13" prop in a Cal 29 and did it work our OK?

roline · #2 (**permalink**) 09-22-2009

Martec 14Dx12P 2GM20 in a Cal 9.2 works great. I attached a RPM hull speed graph. At 3,000 RPM the prop has 40% slippage and at 3600RPM it has 49% slippage; therefore it is more efficient at 3,000RPM. The graph shows that.

Waltthesalt · #3 (**permalink**) 09-23-2009

Thanks lots
why did you go to the Martec folding prop instead of a ferthering prop like Max-prop? I'm repowering from an Atomic 4 which had an old Martec that walked so badly I'd crossed Martec off the list.

CoastalEddie · #4 (**permalink**) 12-15-2009

Quote:

Originally Posted by Waltthesalt

Has anyone installed a 13" prop in a Cal 29 and did it work our OK?

Don't know if you're still interested in info on this, but I have a 13x12 fixed prop on my Cal 2-27 (with a Yanmar 2GM20). I've never plotted the speed verses RPMs, but the graph previously posted for a Cal 9.2 looks pretty close to what I experience.