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American Sportscopter UltraSport 331

Light’s American Sportcopter Ultrasport 331



The Ultrasport 331 is a larger version of the 254 falling within the American Experimental category (FAR Part 21.191g), with increased range and higher gross weight. Features include 10 gallon tank, doors, bigger instrument panel, electric starter. The performance as the 254, and the floor mounted cyclic is standard. Optional floats are available. Meeting the 51% rule, a quick build kit requires 80 hours assembly.

The two-blade composites construction main rotor has tip weights for momentum conservation and an 8 deg linear twist and infinite life. Equipped with a shielded two-blade tail rotor, and tailplane with tins at tip, the tail rotor drive is carried in narrow streamlined tailboom. A centrifugal sprag clutch for starting engages the rotors at 2,000 engine rpm and automatically disengages in the event of engine failure.

The flying controls are conventional collective, cyclic and yaw pedals. A floor-mounted cyclic option has been available since 1998; early models had a top-mounted stick.
The prototype 331 (N331UV) first flew December 1993.

The single seat 331 is powered by one 48.5kW Hirth 2706 dual-carburettor two-stroke engine with electric starter or Hirth H32 of same power in 331H; 12:1 planetary transmission. Fuel capacity 38 litres.

In late 2002, it was announced that Huzbou Taixing Aviation Technology of Huzhou, China was producing helicopters from kits, including examples of Ultrasports.
A single-seat ultralight helicopter, the Ultrasport 331H uses the 48.5kW Hirth H32 added to range in 2003.

The Ultrasport 331 was available for US$37,900 in 2003.


Engine: Hirth 2706, 65 hp
Rotor span: 6.40 m
Blade area: 0.170 sq.m
MAUW: 295 kg
Empty weight: 150 kg
Fuel capacity: 38 lt
Max speed: 167 kph
Cruise speed: 105 kph
Minimum speed: 0 kph
Climb rate: 4 m/s
Seats: 1
Fuel consumption: 14 lt/hr


Engine: Hirth 2703, 55 hp.
Disk span: 21 ft.
Length: 16.67 ft.
Height: 7.5 ft.
Weight empty: 330 lbs.
Gross: 680 lbs.
Fuel cap: 10 USG.
Speed max: 104 mph.
Cruise: 63 mph.
Range: 150 sm.
ROC: 1000 fpm.
Service ceiling: 12,000 ft.
Endurance: 2.5 hr.
Seats: 1.
Landing gear: skids.

Engine: 65hp Hirth 2706 Dual carb, Dual CDI.
Transmission 12:1 Planetary
Rotor Blades: Composite 21' diameter, 7" chord,
Tail rotor: composite 30' diameter.
Empty Weight: 330 lbs
Useful Load 320 lbs
Gross Weight: 650 lbs
Fuel capacity: 10 USG
Width 6 ft 6 in
Height 8 ft 2 in
Length 19 ft 2 in (w/blades off)
Cruise: 65mph
Top Speed: 104 mph
Range: 150 sm
ROC: 1000 fpm
Service ceiling: 12,000 ft
Kit price: US$34,850 (2008)

Ultrasport 331
Main rotor diameter: 6.4m
Tail rotor diameter: 0.76m
Length with rotor blades folded: 5.84m
Height: 2.39m
Take-off weight: 294kg
Empty weight: 150kg
Max level speed: 167km/h
Cruising speed: 101km/h
Max rate of climb: 305m/min
Hovering ceiling, IGE: 3290m
Hovering ceiling, OGE: 2135m
Range with normal fuel at 100km/h: 241km

Ultrasport 331H
Engine: 48.5kW Hirth H32


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