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In page Propeller:
"A cleaver is a type of propeller design especially used for boat racing. Its leading edge is formed round, while the trailing edge is cut straight. It provides little bow lift, so that it can be used on boats that do not need much bow lift, for instance hydroplanes, that naturally have enough hydrodynamic bow lift. To compensate for the lack of bow lift, a hydrofoil may be installed on the lower unit.[citation needed] Hydrofoils reduce bow lift and help to get a boat out of the hole and onto plane.[citation needed]
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