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Old 22 June 2002, 05:18   #1
Country: UK - England
Town: Great Harwood, Lancs
Boat name: Tigger II
Make: Bombardier Aerodeck
Length: 3m +
Engine: Tohatsu 25HP
Join Date: Jul 2001
Posts: 626
Duo Props ?.

I have looked at some previous threads on calculating "typical" boat speeds from prop pitch and RPM etc, and things look stright forward enough.
But how do you calculate it for a Duo prop ?.

If its the same which I would think, has anyone any idea of what slip factors to apply ?.

I have seen figures, for twin outboards that the total power is typicaly 75% of the total. Is this mainly due to the extra leg or the drag of the extra prop, if the latter does this apply to duo props.

Anyway some food for thought.
I know a lot of people use duo props but have been unable to find much info about their characterestics.

Regards Gary
Garygee is offline   Reply With Quote

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