The aircraft was a modification of a 1950s-era Grumman Super Ag Cat biplane that replaced its single radial engine with two 310 hp Lycoming TIO-540 flat-6 engines.
Click to open image viewer. CC0 Usage Conditions ApplyClick for more information. NR1050. Aerobatic biplane flown by Major Alford "Al" Williams as demonstration aircraft for Gulf Oil Company. Similar ...
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