The S5-125 125 HP radial engine was the one used by Kinner in his Auster S1B aircraft.

-On the S1A plane he mounted the Kinner K-5.

-The Security Aircraft Corp, was prepared by Mr. Kinner,

-The company became the American Aircraft Company in 1939.

-The first engine was the S-5-120 which gave 125 HP later it was redesignated as S-5-125.

“Two views of the S-5-125 engine”