The Kinner Sportster was a 1930s American light monoplane built by Kinner Airplane & Motor Corporation. The Kinner Airplane & Motor Corporation had been producing radial engines since 1919 decided to enter the light aircraft market. The first design was a single-seat low-wing monoplane the Kinner Sportster K with a fixed tailwheel landing gear. Further versions followed with different engines. The strut-braced, low-wing, open cockpit, conventional gear aircraft featured folding wings. In 1933, an improved version the Sportwing B-2 was introduced. An enlarged four-seat version was produced in 1935 as the Kinner Envoy. Kinner became bankrupt in 1937 and rights to the Sportster were acquired by the Timm Aircraft Company. The Sportster was also produced after the Bankruptcy by Security-National Corp as the Security S-1 Airster. Variants K Sportster Powered by a 100 hp (75 kW) Kinner K-5 engine. K-5 Sportster B Sportster Powered by a 125 hp (93 kW) Kinner B-5 engine. B-1 Sportster Powered by a 125 hp (93 kW) Kinner B-5 engine. B-2R Sportster B-2 Sportsters modified by Timm aircraft, with 160 hp (119 kW) Kinner R-5 engines, after Kinners bankruptcy;also marketed as the Timm 160. Timm 160 Sportsaters modified by the Timm Aircraft Company powered by 160 hp (119 kW) Kinner R-5 engines. Security S-1 Airster Production of the re-named Sportster by Security-National Corp, formed by Kinner after the original company's bankruptcy
