Plastic glider with Rotowing aileron mechanism

A detailed description can be found in issue 10/1973 of *Aero Revue*, so we can limit ourselves to a brief explanation of the operating principle (see sketch). The pivot axes of the two wing halves are formed by two sturdy pins (6 mm Ø), each of which is mounted in an aluminum sleeve secured to the fuselage via two ball bearings. Turning a rocker arm deflects two tabs, whose movement is transmitted to the wing halves by two thin pins. It is recommended to use precise and, if possible, play-free rudder servos to drive this aileron mechanism.

The wings are made from a foam core covered with a 0.15 mm-thick fiberglass laminate sheet. This construction method was described in detail in issue 4/1974 of *Aero Revue*. This method allows for the production of wings with an almost razor-sharp leading edge and high torsional and flexural strength. Those who prioritize high profile accuracy must proceed with great care when fabricating the core, as it is no longer possible to rework the profile contour after gluing. “Styrofoam” is an excellent core material due to its completely uniform structure. It can be cut with a hot wire or a sharp knife and can be carefully reshaped with sandpaper.

Special attention should be paid to fitting the wings to the fuselage and ensuring minimal gap width. A flexible sealing lip could be advantageous, as it would completely prevent flow separation between the underside and top of the wing.

The model stays in the air surprisingly well even under high wing loading and is completely easy to fly for a moderately experienced pilot. Even in slow flight, the glider responds very smoothly to large aileron deflections. However, it really comes into its own at higher speeds, and that’s when flying it becomes truly enjoyable.