|Directory of U.S. Military Rockets and Missiles|
|Copyright © 2002-2005 Andreas Parsch|
The PWN-7A Rooster was a variant of the PWN-6 Kitty (Arcas) sounding rocket. Instead of a temperature transmitter, it used a ROBIN (Rocket Balloon Instrument) inflatable falling sphere as its payload. At the apogee of the probe's trajectory, a metalized balloon was released and inflated. While it was slowly descending back to earth, the balloon was tracked by a high-precision radar on the ground. Using the balloon's known mass and volume, the radar track could be used to calculate atmospheric data like wind speed/direction and air density. The latter could then be used to calculate air pressure and temperature.
|Photo: via ORDATA Website|
Other than the PWN-6 radiosonde-equipped Arcas, the PWN-7A Arcas-ROBIN required a high-precision radar to get air temperature data. However, its altitude and temperature measurement ranges were somewhat greater than that of the PWN-6's instrument. The PWN-7A was replaced in the 1970s by the PWN-12A, the ROBIN variant of the Super Loki-Dart sounding rocket family.
Note: Data given by several sources show slight variations. Figures given below may therefore be inaccurate!
Data for PWN-7A:
|Length||2.07 m (6 ft 9.5 in)|
|Diameter||11.4 cm (4.5 in)|
|Finspan||33 cm (13 in)|
|Weight||41 kg (90 lb)|
|Speed||> 3950 km/h (2455 mph)|
|Ceiling||65 km (40 miles; 210000 ft)|
|Propulsion||Atlantic Research SR45-AR-1 solid-fuel rocket; 1490 kN (336 lb) for 29 s|
 Richard B. Morrow, Mitchell S. Pines: "Small Sounding Rockets", Small Rocket Press, 2000
 Peter Alway: "Rockets of the World", Saturn Press, 1999
 Frederick I. Ordway III, Ronald C. Wakeford: "International Missile and Spacecraft Guide", McGraw-Hill, 1960
 "Model Designation of Military Aircraft, Rockets and Guided Missiles", Department of Defense, 1970
 ORDATA Online Website
Back to Current Designations Of U.S. Unmanned Military Aerospace Vehicles
Back to Directory of U.S. Military Rockets and Missiles