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Oh trust me real race airboats are light and loose. Under 1000 pounds and the shape of the bottom is very important if you want to win. They are skimming right across the very top of the water, probably less than an inch of hull in the water.
They will fly, but you're right about the thrust helping them stay down. The brake is used when they let off the throttle as the lift is still there but not the thrust
Most aircraft/race airboat engines are 350 HP or less but the car motor boats get way up there.
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