Accession Number:

AD0731023

Title:

Effects of Canopy Geometry on the Drag Coefficient of a Cross Parachute in the Fully Open and Reefed Conditions for a W/L Ratio of 0.264

Descriptive Note:

Corporate Author:

NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s):

Report Date:

1971-08-20

Pagination or Media Count:

66.0

Abstract:

The report describes a series of wind-tunnel tests on the crosstype parachute. The effects of cloth permeability, number of suspension lines, and suspension line length were investigated. Forty-inch-diameter models with a canopy arm width-to-length ratio WL of 0.264 were tested at various velocities from 50 fps to 300 fps in the fully inflated state. Results of these tests demonstrate that the parachute geometry does have an effect on the drag capability of the cross parachute. Additional tests of reefed configurations for several reefing line lengths-to-canopy-diameter ratios from 0.45 to 1.6 at a constant velocity of 275 fps established the reefed characteristics of this parachute. Data are presented in tabular and graphical format. Photographs of representative canopy shapes are included for illustration.

Subject Categories:

  • Aerodynamics
  • Gliders and Parachutes
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE