Accession Number : AD0700020

Title :   THE PROPERTIES OF FLEXIBLE CONICAL LIFTING CELLS FOR AIR CUSHION VEHICLES.

Descriptive Note : Final rept. Sep-Dec 69,

Corporate Author : APPLIED SYSTEMS CORP ROCKVILLE MD

Personal Author(s) : Walker,Norman K. ; Bonsall,Donald E.

Report Date : DEC 1969

Pagination or Media Count : 33

Abstract : Measurements were made of the lift of a series of open ended flexible walled conical cells 16 in dia at the top and 12 in high, with tapers of 5, 10, 16, 20 and 30 deg with varying degrees of ground contact and several angles of tilt. With the edges sealed by contact with the ground the net force is accurately given by the product of the static pressure excess inside the cell, and the area of the gound enclosed by the conical wall. However, if the ground is tilted the cell will 'vent' or 'buckle' and such buckling occurs when the tilt relative to the ground is approximately twice the cone angles. As a result simple conical cells with cone angles of less than 16 deg cannot be relied upon to deploy from every attitude without internal stiffening or tension members, or unless tilt angles of more than 8 deg can be avoided. (Author)

Descriptors :   (*GROUND EFFECT MACHINES, *LIFT), CONICAL BODIES, FLEXIBLE STRUCTURES, TAPER, BUCKLING, AERODYNAMIC CHARACTERISTICS

Subject Categories : Surface Effect Vehicles & Amphibious Vehicles

Distribution Statement : APPROVED FOR PUBLIC RELEASE