Project: MMM radioshack boat! lol

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The down angle on your prop, with stock power is made to push the boat up in order to plane. With so much power you are muscling it out of the water, simple as that. You either need some kind of trims (like an airplane's elevator, but applied to water) or a variable angle outdrive.... you see why this really can't work to well. Not to shoot it down either, I think it's worthy of doing, just with a different boat.