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Pontoon hydrofoil that stops ventilation??

Howmaster

Member
I've got a 21 ft.Suntracker pontoon with a 12 1/2" x 9" three
blade prop. Rpm's are 5500(perfect) SPEED 16mph (perfect)
the "top" of the prop blades are 1" below the bottoms of the
pontoons. And I still get prop blow out at wide open throttle.
the engine is as low as it can go. I lowered the whole engine
pod an inch with spacers. I put on a SE SPORTS 200 hydrofoil.
i still get w.o.t. Blowout!�� I tried a 11 1/2" x 8" four BLADE prop and only got 4000 rpm's.����
HAS ANYBODY EVER MOUNTED A HYDROFOIL ON A PONTOON OUTBOARD THAT ELIMINATED BLOW OUT AT W.O.T ???

*my motor is a MERCURY 40hp 2 stroke...20" long shaft.
I have no unusual water spray behind the pontoon currently.
(the four blade gripped the water better, but still blew out to.)
 
Last edited:
Ayuh,.... Hydro-foils tend to raise the motor in the water,...

Hard to believe any foil will help with prop blow-out,....

Sounds like it needs to be deeper, not shallower,...
 
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