"A Hydroplane is a fast motor boat. The fastest one in 1933 went 78 miles an hour. Now the fastest one went 318 miles an hour. One big Hydroplane event is the sea fair in Seattle Washington ( Wikipedia)."
This is an image of a modern day hydroplane.
This is a vintage hydroplane.
This is what some Hydroplane crashes look like.
Modern and old Hydroplanes are both fast moving boats. They both are a spectator sport. They are both a racing sport like car racing but it is boat racing on water. The boats are sponsored by companies to advertise on the boat. They are all driven by drivers. The drivers move from Hydroplane to Hydroplane.