A hydroplane (or hydro, or thunderboat) is a type of motorboat used exclusively for racing.
A key aspect of Hydroplanes is that they only use the water they’re on for propulsion and steering (not for flotation)—when going at full speed they are primarily held aloft by a principle of fluid dynamics known as “planing”, with only a tiny fraction of their hull actually touching the water.
May 1st, 2010
molitva leyli 
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