A successor to the L6 Grasshopper of WW2, the S.1 BE is a strut-braced high-wing monoplane known as the Arctic Tern, a developed version of the Interstate S.1A, first flown in the 1950s.
Interstate S1B2 Tern Engine: Lycoming O-320-A2B, 150 hp. TBO: 2000 hrs. Prop: McCauley 2-blade, 72-in. Length: 24 ft. Height: 7 ft. Wingspan: 36.8 ft. Wing area: 186.2 sq.ft. Maximum takeoff weight: 1850 lbs. Standard empty weight: 1075 lbs. Maximum useful load: 775 lbs. Maximum landing weight: 1850 lbs. Wing loading: 9.97 lbs/sq.ft. Power loading: 12.3 lbs/hp. Maximum usable fuel: 240 lbs. Best rate of climb: 1275 @ 60 kts. Climb gradient: 765 ft/nm. ROC @ 8000 ft: 820 fpm. Service ceiling: 19,000 ft. Maximum speed: 103 kts. Stalling speed clean: 42 kts. Stalling speed flaps down: 28 kts. Turbulent-air penetration speed: 105 kts. Seats: 2. Fixed tail wheel under carriage. First built: 1975.