bertram31.com

Thanks for the response.

I had the first generation of the BY 260 but yanmar made an upgrade of that engine to the new BY 260 with the steel cover.

You still recommend adding more than an inch of pitch or an inch and cup?

Can props handle more than an inch of pitch without weakening?

Thanks

I'm actually going over about 150 rpm at full throttel.

Hi

I used 4 blade 21x24 on this instalation. Im pushing 25 knots at 3600 rpm and around 28 at wot 4000. Would yo still recommend a pitch change on the props for 21 x25?

Hi

Yes it is a b31 instalation

I currently have Yanmar 6BY260 engines with 2.43:1 gear ratio. I am wondering which would be the right prop ( diameter, pitch, 3 or 4 balde) for that combination.