Hydraulic propeller

a device for propelling ships by means of a stream of water ejected under water rearward from the ship.

See also: Hydraulic

References in periodicals archive ?
The first of the prize-winning patents is a PLC system that regulates, depending on readings for various variables - mainly turbine rotation speed and initial blade pitch, in a controlled manner, the hydraulic propeller that alters the blade's pitch in order to avoid excessive transient loads in the event of strong wind gusts, thereby enhancing overall turbine design, reducing the cost of its structure and extending its lifespan.