A translation for all of you who missed the nuance:
Chance said
Plane speed is 12-14 knots or approximately 14-16 mph.
Top speed is 28 knots, or 32 mph
Cruise is 20 knots, or 23 mph.
While all should be slightly higher, those are pretty good numbers considering the prop depicted.
Gillie, you're right on about the prop blade design in a 3-blade, but I wouldn't want to recommend a pitch til I knew the rpms at each of the above speeds.
Also could be Chance would do well with a 15" four-blade such as the new 13x15 SCD4 series semi-cleaver stern lifting prop. Local here with a Chaparral 198 Fisherman with an late 80's Johnson 120 Looper claims plane speeds down to 14 mph, cruise at 25 mph at 3900 rpm, and WOT of 36 mph at 5600 rpms with that new 15"P SCD4 prop.
That boat empty is 2040 lbs.
__________________
Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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