[alberg30] A30 props

[Christopher Sousa]

From: Christopher Sousa <jsss at net1plus.com>

Peter, 

I would have to agree with Guy... the fact that you can't reach 5 knots
without revving the engine that high sounds suspect.  We have a 12hp
Yanmar, with a 13 inch 3 blade and are able to make 5 knots at 2200rpm. 
If you were to go with a machine pitch 3 blade, it would increase torque
at low rpm, but you would lose a lot of speed under sail...

Regards,
Chris Sousa

> Peter Amos wrote:
> 
> From: "Peter Amos" <P.A.Amos at tesco.net>
> 
> I have a Westerbeke M320B  18hp diesel with 2:1  transmission
> reduction. The prop is a 3 blade 12x8 . To get more than 5 knots I
> have to use 3000+ revs. Is this about right for this combination of
> motor and transmission or could I do better with a different prop?
> Is there a site that gives prop sizes for boat and power combinations?
> Thanks Russ for your comments.
> Peter Amos "Tait Tait" 478
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