Accession Number : ADA262414
Title : Force Distribution in the Suspension Lines of Cross Parachutes
Descriptive Note : Technical rept.
Corporate Author : NAVAL SURFACE WARFARE CENTER SILVER SPRING MD
Personal Author(s) : Ludtke, W P
Report Date : Dec 1989
Pagination or Media Count : 56
Abstract : The force distribution in the several suspension lines attached to an arm of a Cross-type parachute is nonuniform. rhe outer suspension lines carry the minimum force. The forces increase in each suspension line as the line attachment approaches the center of the arm with the maximum force carried by the most central lines. This report describes a series of wind tunnel tests to measure the force in individual selected suspension lines of Cross-type parachutes with 8, 16, and 24 suspension lines. The test results show that . lengthening the inner suspension lines tend Lo equalize the suspension line forces. The static pressure distribution adjacent to the parachute center line was measured for each parachute model. Positive pressures were found to exist ahead of the canopy skirt hem as well as inside the canopy. The magnitude of the pressures is influenced by the canopy cloth permeability.
Descriptors : *LOAD DISTRIBUTION , *PARACHUTES , *PRESSURE DISTRIBUTION , *PARACHUTE CANOPIES , TEST AND EVALUATION , PERMEABILITY , MODELS , DISTRIBUTION , LENGTH , FABRICS , PRESSURE , WIND TUNNEL TESTS , SUSPENSION DEVICES , STATIC PRESSURE , FORCE(MECHANICS)
Subject Categories : Gliders and Parachutes
Distribution Statement : APPROVED FOR PUBLIC RELEASE