American Sportscopter Ultrasport 331

It features a single main rotor, a single-seat enclosed cockpit with doors, skid-type landing gear and a twin cylinder, air-cooled, two-stroke, dual-ignition 65 hp (48 kW) Hirth 2706 engine.

Its 21.00 ft (6.4 m) diameter two-bladed rotor has a chord of 6.7 in (17.0 cm) and employs an ATI 012 (VR-7 mod) airfoil at the blade root, transitioning to an ATI 008 (VR-7 mod) airfoil at the tip.

The ring-mounted tail rotor has a 2.60 ft (0.8 m) diameter and a chord of 2 in (5.1 cm).

With full fuel of 10 U.S. gallons (38 L; 8.3 imp gal) the payload is 290 lb (132 kg).

[1] The manufacturer estimated the construction time from the supplied kit as 60 hours.