Quote:
Originally Posted by Fenlander
Those 15/20hp motors came out of the factory fitted with 10/11/12" props at random so his start point could have been an 11".
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Please don't take this as trying to win an argument, see attachment taken from the Suzuki manual. 9" pitch is nearer the mark.
Prop for 15hp is likely 7/8/9
Prop for 20hp likely 9/10/11
Max theoretical speed (0% slip) for DF15a
7" = 16.6kn/19.1mph
8" = 19.0kn/21.8mph
9" = 21.4kn/24.6mph
10" = 23.7kn/27.3mph
Max theoretical speed (0% slip) for DF20a
9" = 22.4kn/25.8mph
10" = 24.9kn/28.7mph
11" = 27.4kn/31.5mph
12" = 29.9kn/34.4mph
We can knock a couple of knots off the above figures to approximate slip.