The United States Air Force however, emerged as a buyer for the design, purchasing the aircraft for the Credible Chase programme as the AU-24A. It was a much larger aircraft than the Courier, and Helio soon discovered that it was too expensive for the market. Initially conceived by the Helio Aircraft Company as a turboprop-powered variant of the Helio Courier, it eventually emerged as a completely new design of the same general configuration and much of its design was initiated from components used in the Helio H-500 Twin. The Helio HST-550 Stallion was an STOL utility aircraft developed in the United States in 1963. Most aircraft were later sold to the Khmer Air Force. A total of 20 were built during the Vietnam War.
The Helio AU-24 Stallion was an American armed gunship, counter-insurgency, and utility transport developed for the United States Air Force.
Helio AU-24A Stallion in storage at Davis-Monthan AFB, July 1972Īrmed gunship, counter-insurgency, utility transport
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