The most obvious difference between the A-12 and the A-8 is the air-cooled, radial engine in the A-12, which replaced the A-8's inline, water-cooled engine. This was a response to the USAAC's move toward a preference for radial engines, especially in attack aircraft. Designed in response to a 1929 United States Army Air Corps requirement for an attack aircraft to replace the A-3 Falcon (a later post). We will start with the A-8.
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