[MHml] Prop Pitch for Multihulls

[Paul Nudd]

The Yamaha 9.9 has a 2.92:1 bottom gear set and 11-1/2 x 10-3/4 3 blade prop (totally from memory; check Yamaha's web sites; it should have something) - - - - - - - - - 
Yamaha also have alternative props for the 9.9 available with the same diameter and different pitches.
I found the standard prop best on XL2 (39' 3 tonne) but got better performance with different pitch on previous boats (24' and 27' catamarans). On XL2 I can just get 8 knots - flat water, no wind. On the smaller cats with different pitch I got 11 knots.

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