COMPARISON OF THREE THEORIES OF WATER-JET PROPULSION
NAVY MARINE ENGINEERING LAB ANNAPOLIS MD
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The three different approaches to derivation of formulae expressing the relations among speed, thrust, power, and efficiency of water-jet propulsion systems, as developed by Lockheed California Company Virgil Johnson of Hydronautics, Incorporated and Joseph Levy of Aerojet-General Corporation, are summarized and compared. Certain modifications and simplifications are incorporated, and terminology is modified as necessary to facilitate comparison. The Lockheed system, which provides a method for including the weight and drag of the propulsion system in the optimization procedure, appears to be the more useful. The problems of compromising the performance of the propulsion system at cruising speed in order to provide reasonable hump performance are briefly discussed.
- Jet and Gas Turbine Engines