F3A CONTRAST LT, Инструкция по эксплуатации

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5.2. Elevator
The stabilizer parts are also vacuum bagged sandwich molded using
lightweight fiberglass cloth and 1,5 mm Airex foam construction. The
elevator control surfaces are elastic-hinged. Each elevator panel weighs
between 90 and 100 grams, depending on the color scheme.
From the bottom of the stabilizer, elevator gap are covered with glass fiber
seal.
The horizontal stabs are mounted on a 10 mm aluminum tube (must be
glued during the elevator assembly process), with a 3 mm carbon or
aluminum anti-rotation axis at the front.
In order to increase the stability of inverted flight,
also to offer more finite control in rolling maneuvers
the model can be equipped with downward
dihedral (with any angle from -1 to -5 degree) or
straight stabilizer.
Negative angle dihedral stabilizer (- 5 degree)
Because the axis of the hinge is not at the centerline of the elevator, so it
moves slightly in and out when operated, and the elevator gets a little
"bigger" in surface area when moving up, and "smaller" when moving
down. This means that you need program in up to 10 % negative elevator
differential in your transmitter more than the positive.