constant-speed unit

constant-speed unit (CSU)

constant-speed unit (CSU)click for a larger image
Flyweights which are balanced by the oil pressure, increase or decrease the pitch and maintain propeller speed constant.
An engine-driven unit used for variable-pitch propellers. A CSU automatically permits adjustment of the pitch for varying the speed and power. This allows the propeller to operate more efficiently at any selected combination of RPM, manifold absolute pressure, and air speed.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
In an attempt to do a comparative performance benefit based on similar chiller price, the base efficiency of the constant-speed chiller was improved by 10% by taking the additional dollars spent on a variable-speed drive and applying it to improve the design performance for the constant-speed unit (generally in the form of more effective heat exchangers).
Electric motors have high power-to-weight ratios and, when sized properly, can provide sufficient torque over a wide speed range to replace a multi-speed transmission with a simple constant-speed unit. At their most basic, series hybrids use the combustion engine to drive a starter-generator that provides power to the electric motor(s).
The equipment also requires more room within the station, and may produce more noise than a constant-speed unit. Once the station type, flow requirements, and type of pump have been established, a number of pump station accessories must be considered.

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