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The Voith Schneider propeller or tractor system using adjustable vertical hydrofoil blades, independently rotating on a circular base mounting that by developing lift can direct propulsion in any direction.

Related Terms


A propulsion system with the motor mounted near the stern, coupled by a shaft to an external outboard drive unit. The components of this unit are similar to those of an outboard engine drive, having forward and reverse gears, a vertical shaft, and a propeller shaft.


Liquid cooling system in which the cooling liquid flows down vertical tube exterior surfaces in a thin film, and hot process fluid flows upward through the tubes.


The vertical pulse height of a signal, usually base to peak.


Referring to a system of numbers with a base of 2; used extensively in computers, which use electronic on-off storage devices to represent the numbers 0 and 1


A system of vertical blades used to propel tugs and ferries, also called a cyclonic system due to the way the blades turn.


A propeller drive system similar to the lower part of an outboard motor extending below the hull of a larger power boat or yacht, but driven by an engine mounted within the hull. Unlike a fixed propeller (but like an outboard), the boat may be steered by twisting the drive.


The vertical angle at the level point, between the line of fall and the base of the trajectory.


  1. A unit accepted temporarily for use with the International System of Units; 1 standard atmosphere is equal to 101,325 pascals. 2. A hypothetical vertical distribution of atmospheric temperature, pressure, and density which is taken to be representative of the atmosphere for various purposes.


Ocean vessels constructed with heavyduty submersible hydraulic lift or elevator system at the stern of the vessel. The SeaBee system facilitates forward transfer and positioning of barges. SeaBee barges are larger than LASH barges. The SeaBee system is no longer used.


The base unit of electric current in the International System of Units; it is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross section

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