Author: JOHN T. MC SHERA Publisher: ISBN: Category : Languages : en Pages : 1
Book Description
A wind-tunnel investigation has been conducted to study the characteristics of a towed spherical balloon as a drag device at Mach numbers from 1.47 to 2.50, Reynolds numbers from 0.36 times 10 to the 6th power to 1.0 times 10 to the 6th power, and angles of attack from -15 to 15 degrees. Towed spherical balloons were found to be stable at supersonic speeds. The drag coefficient of the balloon is reduced by the presence of a tow cable and a further reduction occurs with the addition of a payload. The balloon inflation pressure required to maintain an almost spherical shape is about equal to the free-stream dynamic pressure. Measured pressure and temperature distribution around the balloon alone were in fair agreement with predicted values. There was a pronounced decrease in the pressure coefficients on the balloon when attached to a tow cable behind a payload. (Author).
Author: J. S. Deitering Publisher: ISBN: Category : Languages : en Pages : 38
Book Description
Tests were conducted in the 40-in. supersonic Tunnel A of the von Karman Gas Dynamics Facility to investigate the drag and stability characteristics of a series of flexible decelerator models. The models were tested at Mach numbers from 1.5 to 6 at dynamic pressures corresponding to pressure altitudes of 75,000 to 135,000 ft, respectively. Four basic decelerator configurations were examined: hyperflo parachutes at variable locations aft of three fore body models, hemisflo parachutes with varied amounts of canopy inlet reefing, a tandem configuration composed of a hyperflo parachute inside the suspension lines of a hemisflo parachute, and a conical ballute decelerator.
Author: JOHN T. MC SHERA
Author: John T. McShera
Author: John T. McShera
Author: J. S. Deitering
Author: A. B. Blair
Author: Kenneth W. Mort
Author: 
Author: 
Author: Willard G. Smith
Author: