This is based on 70 percent of power settings and an average true air speed of 122 knots.
HELIO AIRPLANE FULL
The L-28A with a crew of two and full fueland oil has a maximum payload of approximately 100 pounds and a radius of action of 205 nautical miles with a 30 minute reserve. With the stick fullback, settling occurred within the IAS range of 30-41 knots, dependent on the power and flap settings. The airplane could not be stalled completely with any combination of power and flaps. The airplane was very sensitive to light air turbulence which resulted in excessive control manipulation to maintain altitude and heading. As a result, control pressures were required to maintain straight and level flight under varying load conditions. Roll and yaw trim controls were not provided. Pitch trim was provided in the cockpit and was highly sensitive. Crosswind landing gear with locking provision is incorporated. Pitch control is obtained with an all-horizontal tail and only pitch trim is provided. Short span Frieze ailerons, which are fabric covered, are used for lateral control in conjunction with leading edge interceptors (spoilers).
Full span leading edge slats are provided as additional high lift devices. Slotted flaps are actuated by means of a hand crank, eighteen revolutions of the crank being required to obtain the full flap deflectionof 40 degrees. Dual flight controls are provided except that toe brakes are provided for the pilot's position only. An open baggage compartment is located behind the rear seat. Entrance to the front seat is through the left front door and to the rear seats through the right rear door. The pilot's seat is ground adjustable vertically. It is a five-place airplane with two tandem side-by-side seats and a fifth seat in the rear of the cabin area.
It is powered by a Lycoming GO-480-G106 engine turning a three-bladed Hartzell constant-speed propeller 96 inches in diameter. It is a fully cantilever high wing monoplane of all-metal construction. The USAF L-28A is a military version of Helio Courier Model 395.
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