Hydrocycle

The concept was known in the 1870s as a water velocipede[1] and the name was in use by the late 1890s.

[2] Power is collected from the rider via a crank with pedals, as on a bicycle, and delivered to the water or the air via a propeller.

[3] Seating may be upright or recumbent, and multiple riders may be accommodated in tandem or side-by-side.

[4] Buoyancy is provided by two or more pontoons or a single surfboard,[citation needed] and some have hydrofoils that can lift the flotation devices out of the water.

[5][6][7] Brands include Seacycle, Hydrobike, Water Bike, Seahorse (Cross Trek)[8] and itBike.