[alberg30] A30 props

[Peter Amos]

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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