Movable ramp inlet for water jet propelled ships

Details Movable ramp inlet for water jet propelled ships Movable ramp inlet for water jet propelled ships

B - Operations, Transporting

63

H

115/15

B63H 11/10 (2006.01) B63H 11/04 (2006.01) B63H 11/103 (2006.01)

Patent

CA 1042275

INVENTORS VIRGIL E. JOHNSON, JR., ROBERT J. ETTER, HORTON W. LAIN, LARRY K. STEPHENS and PETER VAN DYKE TITLE MOVABLE RAMP INLET FOR WATER JET PROPELLED SHIPS ABSTRACT OF THE DISCLOSURE A movable ramp, forming part of the inlet flow channel of a water set propulsion system, is adjustable to provide variable inlet area for various speed and propulsion re- quirements. In this flush or semi-flush type inlet, the lower lip is stationary and an upper ramp, forming an extension of the base line shell, directs the flow into the inlet, If the baseline shell is not suited to the inlet installation, (for example, if a high deadrise angle exists) a forebody fairing is provided to make the baseline shell geometry suitable. The ramp is flexible, has a smooth sur- face, and is backed up by bell cranks and pusher bars that can move the ramp position to change the inlet area. The The ramp position or inlet area may be adjusted manually or automatically to meet the requirements of speed and propulsion. If the centerline of the lip leading edge radius falls below the normal baseline (semi-flush inlet) suitably shaped "sideplates" are provided to avoid inlet cavitation or ventilation at yawed conditions. A "pressure alleviatation" system may be provided to reduce the static pressure differential across the ramp to alleviate the structural design loading and reduce the total force re- quired of an actuator to move the ramp.

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