fuselage profile to allow fitting of a hopper-tank in the rear seat position. PA-18S Designation for production aircraft fitted with floats. PA-18AS Designation of a small number of agricultural aircraft fitted with floats. PA-19 Super Cub Original designation of the military variant of the PA-18, only three built and all subsequent military production were designated as PA-18s. Aeromod Loadstar Model 100 Biplane conversion of Super Cub, powered by O-290-D engine, designed for improved capability from high-altitude airfields. SAFAT 01 A Sudanese development / copy built by the SAFAT Aviation Complex at Khartoum. Military designations L-18C Super Cub Military designation of the PA-18 Super Cub for the United States Army, powered by a 95 hp (71 kW) Continental C90-8F piston engine, 838 delivered, at least 156 of which were delivered to other nations under MDAP. YL-21 Super Cub Two Super Cub 135s for evaluation by the United States Army. L-21A Super Cub Military designation of the Super Cub 125, powered by a 125 hp (92 kW) Avco Lycoming 0-290-II piston engine, 150 delivered. L-21B Super Cub Military designation of the Super Cub 135, powered by a 135 hp (101 kW) Avco Lycoming 0-290-D2 piston engine, 584 delivered many to other nations under MDAP, re-designated U-7A in 1962. TL-21A A number of L-21As were converted into training aircraft. U-7A Super Cub 1962 redesignation of the L-21B. Operators Military operators Argentine Air Force Argentine National Gendarmerie Austrian Air Force Belgian Army Federal German Luftwaffe Greek Army Imperial Iranian Air Force Italian Army Israeli Air Force Japan Ground Self-Defense Force Force Aérienne Katangaise Netherlands Air Force Nicaraguan Air Force Royal Norwegian Air Force Portuguese Army Portuguese Air Force Swedish Army Swiss Air Force 4 PA-18-150 served with the Swiss Airforce, as V-653 to V-656, from 1964 to 1975. V654 became HB-PAV, V655 HB-PAW, V656 HB-PAX. Turkish Army Uruguayan Navy United States Air Force United States Army Civilian Users Alaska State Troopers U.S. Fish and Wildlife Service, Alaska U.S. Border Patrol Southwest Border Specifications (PA-18-150 landplane) See also References Bibliography John Andrade, U.S. Military Aircraft Designations and Serials since 1909, Midland Counties Publications, 1979, Peperell, Roger W. and Colin M. Smith. Piper Aircraft and their forerunners. Tonbridge, Kent, England:Air-Britain, 1987, Steinemann, Peter. "Protector of the Plate". Air International, Vol. 42, No. 2, February 1992. pp. 73–78. . Taylor, John W. R. Jane's All The World's Aircraft 1967–68. London: Sampson Low, Marston & Company, 1967. Taylor,