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Prop Blowout on Small Motor

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cchesson View Drop Down
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Joined: 08/03/2020
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    Posted: 08/03/2020 at 8:37pm
Greetings, all!  Have a very confusing situation made worse by the fact that I'm a relative newbie to the pontoon world.  I'm running an 18' pontoon on a horsepower-restricted lake, so I replaced the dead 50HP motor with an awesome brand new Suzuki DF20 (20HP).  Not expecting miracles--lot of boat, little motor--just hoping to maybe hit 10 MPH, even if that's with a tailwind.  Problem is that as soon as I hit about 5MPH, I experience full prop blowout.  Current prop is the Suzuki OEM for that size motor: 10" Dia, 7-Pitch, 4-blade high thrust.

I know the first and most obvious answer is mounting height... I've tried it so low that the cavitation plate is probably 8" under the motor pod and the lower cowling is getting wet and (using a jack plate) so high that the cavitation plate is about even with the pod.  Seems that having it just a couple/few inches below the pod is my current "sweet spot", but the blowout remains.  Any higher and it blows out almost immediately; much lower and it feels like the whole thing is just dragging through the water (and ultimately still blows out at 5 MPH).

What else can I try?  Prop selection?  Yet another height change?  Something I should look for further forward on the boat that could be introducing turbulence?  Can't believe I'm having trouble getting a little 20HP motor to bite, but here we are...

Thanks!  -Chris
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