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Interplane Skyboy / S1 Cobra



A two place, side by side ultralight has a composite fuselage, an automobi;e like instrument panel and faired undercarriage. Power is with a Rorax 503, with a Rotax 582 optional, in pusher configuration at the back of the cockpit area and behind the trailing edge of the wing. The tail is on a tubular tailboom with conventional three axis controls. A high wing-aluminium & composite microlight, the Skyboy has a fully enclosable composite cabin with dual controls.
The Skyboy comes preassembled by Czech firm LET.
The agent in France was Junkers Profly.
The price in France, 1997, ex France, including engine and propeller was approximately US$22,400.
The "Skyboy" was renamed the S1 Cobra.




The Skyboy was offered with two different wing profiles. One for low speed manoeuvrability and one for fast cruise.


Engine: Rotax 503
Wing span: 34.5 ft
Length: 20.8 ft
Empty weight: 447 lb
MTOW: 990 lb
Stall: 35 kt / 40 mph / 64 kmh
Cruise: 83 kt / 95 mph / 153 kmh
VNE: 111 kt / 128 mph / 206 kmh
Climb Ratio: 1050 ft/min / 5 m/s
Take-off distance (50ft obstacle): 330 ft / 101 m
Landing distance (50ft obstacle): 380 ft / 116 m


Engine: Rotax 582, 64 hp
Wing span: 10.5 m
Wing area: 15.2 sq.m
MAUW: 450 kg
Empty weight: 210 kg
Fuel capacity: 42 lt
Max speed: 150 kph
Cruise speed: 120 kph
Minimum speed: 54 kph
Climb rate: 5.5 m/s
Seats: 2
Fuel consumption: 15 lt/hr
Price (1998): 32 000 DM






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