Accession Number : AD0480823

Title :   SINGLE CONE AERIAL PICK-UP CANOPIES; COMPARATIVE WIND TUNNEL TESTS.

Descriptive Note : Final rept. 1 Jun-1 Aug 65,

Corporate Author : AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Riffle,Arnold B.

Report Date : JAN 1966

Pagination or Media Count : 16

Abstract : An experimental investigation to determine the aerodynamic drag and static stability characteristics and the infinite mass opening shock factors of models of two types of parachute canopies modified for aerial pick-up operations and a comparative evaluation between the resulting performance data and those of the basic (unmodified) canopy types was conducted. Parachute canopy models of the solid flat circular and 10% flat extended skirt types, modified to incorporate a single truncated cone attached to the canopy roof were tested for this purpose. The drag and moment coefficients of the modified canopy models were determined for angles of attack over a range of + or - 30 degrees. From the moment measurements, the positions of static equilibrium were established for each model. Opening forces generated by the models were acquired for the captive (infinite mass) operating condition. All models tested were statically unstable about zero degree angle of attack; however, a comparative evaluation shows that the angular magnitude of the position of equilibrium decreases for both types of parachute canopies if a single truncated cone is attached to the canopy roof. This decrease in angular magnitude is larger for the solid flat circular type canopy than for the 10% flat extended skirt type canopy.

Descriptors :   (*PARACHUTES, AERODYNAMIC CHARACTERISTICS), DRAG, STABILITY, WIND TUNNEL MODELS, MODEL TESTS, PERFORMANCE(ENGINEERING), DEPLOYMENT, SHOCK(MECHANICS), AERIAL PICKUP SYSTEMS, MOMENTS, ANGLE OF ATTACK, FORCE(MECHANICS), CONICAL BODIES, VENTS, EXPERIMENTAL DATA

Subject Categories : Gliders and Parachutes
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE