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Rooster

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AKA: PWN-7.

Historical Essay © Andreas Parsch

Atlantic Research PWN-7 Rooster

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.

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:

[1] Richard B. Morrow, Mitchell S. Pines: "Small Sounding Rockets", Small Rocket Press, 2000
[2] Peter Alway: "Rockets of the World", Saturn Press, 1999
[3] Frederick I. Ordway III, Ronald C. Wakeford: "International Missile and Spacecraft Guide", McGraw-Hill, 1960
[4] "Model Designation of Military Aircraft, Rockets and Guided Missiles", Department of Defense, 1970

Family: pad-launched. Country: USA. Engines: SR45. Agency: Atlantic Research.