Accession Number : ADD014162

Title :   Air Cushion Vehicle Stern Seal.

Descriptive Note : Patent, Filed 13 Sep 88, patented 30 May 89,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Bell, James C

Report Date : 30 May 1989

Pagination or Media Count : 4

Abstract : This patent discloses an improved stern seal construction for air cushion supported marine vessels which consists of an array of inflatable, vertically oriented inverted truncated open-ended cones or fingers. These fingers are individually attached to and mounted to depend in side-by-side relation from the bottom of an inflatable bag which in turn is mounted upon and extends transversely across and below the bottom of the stern end of the vessel's hull. The fingers are arranged in side-by-side pressed together relationship, and thus assume in horizontal section generally rectangular forms. In side view sectional profile, the finger and bag contours are so balanced that a minimum load at the bottom ends of the fingers will permit them to raise to allow for passages over rough objects. The front or leading panels of the fingers are stiffened somewhat toward their bottom ends, and are extended under the bottom of each finger in the manner of a flap valve, preventing water or other terrain material from entering the bottom of the finger such as would otherwise permit undesireable scooping thereof into the air cushion stern seal system. The fingers are preferably tapered in rear view at their bottom ends so as to provide for each finger an improved inflated shape stability performance when the ship is operating over a terrain surface which intermittently 'falls away' from the bottoms of the fingers. (edc)

Descriptors :   *AIR CUSHION VEHICLES, *CUSHIONING, *PATENTS, BAGS, BOTTOM, CONSTRUCTION, CONTOURS, FINGERS, FLAPS(CONTROL SURFACES), HORIZONTAL ORIENTATION, INFLATABLE STRUCTURES, MATERIALS, PROFILES, SURFACE ROUGHNESS, SEALS(STOPPERS), SHIP HULLS, SHIP STERNS, SURFACES, TERRAIN, VALVES, WATER

Subject Categories : Surface Effect Vehicles & Amphibious Vehicles
      Adhesives, Seals and Binders

Distribution Statement : APPROVED FOR PUBLIC RELEASE