A Hydroplane is a high-speed  motorboat that skims over the water almost in the way a flat skipping stone does when thrown.  The boats bottom is shaped to lift the hull as it speeds up,until the boat is ''planing''over the surface.  The shape of the bottom allows the pressure of the water  to lift 

the boat and keep it on the surface as long as it keeps moving  quickly.  For this reason,the  must be flat ,or only slightly curved.  In some 

Hydroplanes ,the bottom section.   Many racing Hydroplanes are called

three point boats.   The only parts of the boat that touches the water at high speed are flouts or sponson on each side of the hull and the propeller.

Glenn Curtis was an American inventer.   He made inportant contributions 

to the development of aircraft.   He manufactured airplanes, and

made thosands of planes during WW1.