High Quality Plan Sets for Radio Control Aircraft
Building photos of the Plecan Simplex
Details of the connections at the tail. Control horns are made of carbon fiber but I recommend G10/FR4 (circuit board material is similar) as it is easier to work the
material. Since I built this one I have shifted to using a double loop of fine beading wire as it is easier to twist. In order to get the surfaces in a neutral position power
up the radio and with trims and sub trims set to zero alternately tighten the loops until the surfaces are faired and there is good tension on the Kevlar. Once the tension
is right a second single loop of wire is installed for redundancy. The knots on the Kevlar are multiple square loops which are secured with a small drop of CA.
Wick the excess CA off with a paper towel so it doesn't travel down the string. The hinges were installed by routing in to the moving surface where the pin needed to be
installed and gluing in steel pins in with thick CA and accelerator. Then the area was filled out with balsa and sanded to a round shape to match the rest of the surface.
After the surfaces were covered the rudder and elevator were mounted by installing the non-moving hinge parts in the stabilizers with thick CA.
Templates for the control horns and hinge parts are on the plan.
Rudder is hinged by a steel pin in the bottom and a small Robart hinge visible near the top of the rudder. Align all hinges so the center of rotation is the middle of the
radius sanded in to the moving surface. Small gaps between sufaces are achieved this way and the gap is the same no matter what angle the moving surface takes.
