polystyrene foamies

It is cut in white polystyrene (building type) and presents the following characteristics:


1000 mm


400 mm / 200 mm


clark YS (GIF and co-ordinates)


70/40 mm (approximately 20% of the cord)


125 to 130 mm of the nose

chock of elevons

neutral to -16 mm with the root


  • ailerons: +20/-30mm
  • depth: +-30 mm


  • height: 160 mm
  • width: 160 mm (all the cord except elevon)
  • unspecified triangular form...

The construction technique is very simple. You should manufacture a gauge, cut out the cores (method of the fixed point ), separate the control surfaces from each half-wing.To manufacture of the gauge, the trailing edge of the clark-YS can be aligned on the under-surface, cutting will be thus facilitated. You can download the profile then increase it to the right dimensions with a photocopier for example. The profile being then quasi flat with the under-surface, one can carry out the cutting while turning around the leading edge with the hot wire if you took the precaution to align the under-surface with the bottom of the polystyrene bread.

Then, you cover the wings with the Scotch tape :

  • the half-wings while starting with the trailing edge, a first tape must join under-surface and suction face, then the other Scotch tape overlaps with one cm approximately.
  • two control surfaces.

The two wings are simply taped together by a tape wrapped all around the root.

The control surfaces are fixed with blenderm on each side of the articulation.

The position of the servos, the accumulator and the receiver are located in ordert to obtain a good centering. They should be placed quite close to the nose to avoid lead...
Then, one carves polystyrene directly through the Scotch tape with a standard soldering iron. (I ensure you that it works, if you do not believe me test it on a spare... ATTENTION the released vapor is toxic ==> do it outside or close to an opened window!) By the way, did you know that micro$oft software are like airconditioning systems ; they don't work properly with windows opened ...

The RC parts are then embedded tand maintained by Scotch tape...

The control horns are cut out in a telephone card hot folded on gas. They are maintained by double sided Scotch tape.

The linkage is out of 1mm piano wire passing through a tube (one can also make heavier and directly attack the servos), the trimming of the neutral is done by a domino of electrician.

I forgot to say that one needs (it is obvious) a mixer ailerons/elevator which can be either at the emission if your radio allows it, or electronic embarked, or mechanics like kavan one.

The drifts in 6mm depron are taped with the double at the tip of each wing. A Scotch tape wrapped on each side (under-surface and suction face) reinforces the assembly.

(RQ: the drifts are not on the photograph...)