Accession Number : ADA111782

Title :   Drag Characteristics and Suitability of Three-Foot Long Parachute Decelerators,


Personal Author(s) : Calianno,Carl T

PDF Url : ADA111782

Report Date : 14 May 1981

Pagination or Media Count : 10

Abstract : Air drop and wind tunnel tests were conducted to verify the stability of sonobuoys with decelerators limited to a total length of three feet. This limitation was established for safety reasons. The existing decelerator systems are configured to a length of 5 to 12 feet, with cross-type canopies varying in area from 1.5 to 3.5 square feet. Sonobuoys are blunt nose right circular cylinders, 4-7/8 inches in diameter, 36 inches long ranging in weight from 12 to 39 pounds. Testing established that suitable stability could be achieved using a three-foot long decelerator. Drag coefficient, opening load, high altitude air descent time and stability data were also determined for three-foot long decelerators. (Author)

Descriptors :   *Parachute canopies, *Deceleration, Aerodynamic drag, Aerial delivery, Sonobuoys, Aerodynamic stability, High altitude, Parachute descents, Opening(Process), Loads(Forces), Aeroballistics, Sizes(Dimensions), Wind tunnel tests

Subject Categories : Gliders and Parachutes
      Acoustic Detection and Detectors
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE