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The aircraft was designed to comply with the Fédération Aéronautique Internationale microlight category and the US light-sport aircraft rules. [2] [3] It features a strut-braced hang glider-style high-wing, weight-shift controls, a two-seats-in-tandem open cockpit, retractable wheeled tricycle landing gear and dual floats and a single engine in pusher configuration.
The Seahawk uses an "A" frame control bar for weight-shift control. The hull was carefully designed to account for the inherent lack of pitch control that trikes have while on the water. It was designed to reduce porpoising and water spray being thrown into the crew seats and propeller.
Early powered versions consisted simply of a motor added to the foot-launched hang glider version with control by a combination of weight shift for pitch and tip rudders for roll and yaw, with the tip rudders used together as air brakes. Because many pilots could not run fast enough to achieve take-off, wheeled tricycle gear was added.
It features a cable-braced hang glider-style high-wing, weight-shift controls, a two-seats-in-tandem open cockpit, tricycle landing gear and a single engine in pusher configuration. [ 1 ] [ 3 ] The aircraft wing is made from bolted-together aluminum tubing, with its single, or optionally double-surface, wing covered in Trilam sailcloth.
The aircraft has a standard empty weight of 250 lb (113 kg). It features a cable-braced hang glider-style high wing, weight-shift controls, an open cockpit, tricycle landing gear and a single engine in pusher configuration. [1] The aircraft is made from bolted-together aluminum tubing, with its single-surface wing covered in Dacron sailcloth.
On the early models the pilot is accommodated on a sling seat suspended from the main wing keel tube, to allow weight-shift control. The standard engine supplied was the single cylinder, two-stroke Yamaha KT-100S of 15 hp (11 kW), although a Kawasaki 440 snowmobile engine producing 38 hp (28 kW) was optional.
Many of the early ultralights used a "weight shift" method of control, requiring the pilot to push a control bar to shift the center of gravity of the aircraft. The Weedhopper differed from most other ultralights of the period in that it has a control stick which moves the rudder and elevator, giving it two axis control in pitch and yaw.
The aircraft has a maximum gross weight of 180 kg (397 lb). It also complies with the requirements of the US FAR 103 Ultralight Vehicles rules. It features a cable-braced hang glider-style high-wing, weight-shift controls, a single-seat open cockpit, quadracycle landing gear and a single engine in pusher configuration. [1]