Accession Number : AD0718808

Title :   A New Approach to the Determination of the Steady-State Inflated Shape and Included Volume of Several Parachute Types in 24-Gore and 30-Gore Configurations,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Ludtke,William P.

Report Date : 03 SEP 1970

Pagination or Media Count : 56

Abstract : AD-702041 documented a new method of determining the steady-state inflated shape and included volume of several types of parachutes in 12-gore and 16-gore configurations. This report uses the methods and technique of AD-702 041 to extend the data to 24-gore and 30-gore configurations of the flat circular, 10 percent extended skirt, 16 percent porous ring slot and 24 percent porous ribbon parachutes. The inflated elliptical shapes of the various canopies were obtained from photographic records of the wind-tunnel tests at various velocities from 17 mph to 200 mph using parachute models of approximately 40-inch flat diameter. The steady-state canopy volume includes the volume of the billowed gore panel and an air volume ahead of the canopy skirt hem. The results of this investigation are particularly applicable to studies of canopy stress analysis and determination of the volume of air which must be collected during canopy inflation process for use in the calculation of opening-shock force. (Author)

Descriptors :   (*PARACHUTES, AERODYNAMIC CONFIGURATIONS), INFLATABLE STRUCTURES, VOLUME, POROUS MATERIALS, MODEL TESTS, STRESSES, SHOCK(MECHANICS), RIBBON PARACHUTES

Subject Categories : Gliders and Parachutes

Distribution Statement : APPROVED FOR PUBLIC RELEASE