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The S-1S competition version has four ailerons (to boost the roll rate), symmetrical airfoils (allowing the aircraft to perform maneuvers from any attitude) and generally, a 180-hp Lycoming engine for more power. The S-1S gave U.S. aerobatic pilots the equipment they needed to compete successfully in international contests. Five members of the winning 1972 U.S. Aerobatic Team flew the S-1S and two
- द्वारा Curtis Pitts, J. Dawson Ransome
- श्रेय: Gift of J. Dawson Ransome
- अधिकार: CC0
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