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SUPERSONIC SUNDAY – ADP Anechoic Chamber Reduction of Radar Cross Section of Large High Altitude Aircraft By Clarence L. “Kelly” Johnson This report is a short summary of some of the work done by the Advanced Development Projects Division (ADP) of Lockheed Aircraft Corporation (known more widely as the Skunk Works) in reducing the radar cross section of various aircraft designs during the period 1956 to 1974. The general activity was instigated in the time period when the Lockheed U-2 entered service in 1956 making numerous overflights of the Russian land mass. The Soviet reaction to these flights led them to accelerate their developments in radar (Tall King, Fan Song, etc.) and missiles. leading to the SA-2 type, which finally shot down Francis Gary Powers on May 1, 1960. During the period 1956 through 1960, ADP undertook many studies of various aircraft designs intended to reduce the radar cross section as well as to improve the cruising speed, altitude, and range of reconnaissance aircraft. Shape factors lead to consideration of all forms of aircraft including flying saucers, which fundamentally have a low radar reflection from low viewing angles. Materials, such as rubber, plastics, inflated Mylar, carbon loaded honeycomb, etc., were used to configure many different designs. After the Powers incident, work on reducing the vulnerability of the U-2 accelerated to meet the threat. Electronic countermeasures - ECM for warning the pilot against radar sightings, for jamming missile guidance systems, and aircraft gunnery radars were given the highest possible priority. (ECM developments and reduction of high-altitude optical visibility will not be reported herein.) These were run in a small radar anechoic chamber having dimensions of 12' x 12' x 30' and later in the new large ADP anechoic chamber over a 10 year period. You are the first ones to see these pictures as they have never been published before. Stay tuned for more! 📷 @LockheedMartin SR-71 model in Anechoic chamber #SR71Blackbird #SR71 #A12 #LockheedMartin #SkunkWorks #AVporn #AVgeek #Oxcart #Pilot #SkunkWorks #AdvancedDevelopmentProjects #cockpit #Anechoic #AnechoicChamber #USAF #Mach
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