Accession Number : ADA116357


Title :   Materials and Design Criteria for Kevlar-29 Ribbon Parachutes


Descriptive Note : Final rept. 1 Sep 1975-1 Mar 1980


Corporate Author : AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH


Personal Author(s) : Pinnell, William R.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA116357


Report Date : APR 1982


Pagination or Media Count : 269


Abstract : This report contains information and design criteria for application of Kevlar-29 (intermediate modulus para-aramid) textile materials to ribbon parachutes. Textile materials for this application are listed, their properties and limitations discussed, and methods for tensile testing presented. Twenty degree conical continuous ribbon parachute test items were designed and fabricated using Kevlar-29 textile materials entirely. The results of air drop and sled track testing at subsonic and transonic conditions are presented and design criteria based on these results are reported. The effects of reefing (two stages) on aerodynamic performance of the 15.3 ft nominal diameter parachutes is also reported. The report treats joining techniques for kevlar-29 parachute components and presents the results of tensile tests of joint samples. Design considerations and fabrication techniques related to application of Kevlar-29 materials are included. A comprehensive list of references useful to the parachute or decelerator system designer is provided.


Descriptors :   *TEST AND EVALUATION , *MATERIALS , *POLYAMIDE PLASTICS , *EXPERIMENTAL DESIGN , *FABRICATION , *RIBBON PARACHUTES , PERFORMANCE(ENGINEERING) , TENSILE TESTERS , PLASTIC COATINGS , STRESS CONCENTRATION , METALLIC TEXTILES , YARNS , DROP TESTS , STRUCTURAL PROPERTIES , HIGH STRENGTH , AERODYNAMIC CHARACTERISTICS , NYLON


Subject Categories : GLIDERS AND PARACHUTES
      PLASTICS
      TEST FACILITIES, EQUIPMENT AND METEORS


Distribution Statement : APPROVED FOR PUBLIC RELEASE