Elevon hinges:

As supplied by the factory each Elevon has three hinges, this has been reported as insufficient by others and it is recommended to add two more hinge points to each surface.

The Elevon itself is a hollow structure in the locations that require the additional hinge points, to remedy this situation I cut out two hard balsa formers for each location and epoxied into place. The reason for two parts was to be able to fit the part in the smallest hole possible for the hinge point, I applied epoxy liberally to each part and then slid down into the hole. After the epoxy was cured I then Dremeled the u shaped pockets and drilled the holes for the hing points.

The TE of the wing also did not have any area for the hing points to mate into, in the areas where I opened up the wing I was able to epoxy in some hard balsa blocks, in the other area in which is inaccessible a hard wood dowel can be used by drilling a clearance hole and epoxying into place making sure to use a liberal amount of epoxy to make a bond with the upper and lower wing skins.

The control horn location was marked on the surface and then cut with a Dremel cutoff wheel making sure that the leading edge material of the control surface was not cut into.

When mating the surface to the wing I used a drop of oil on the hing pin so any stray epoxy would not create a drag on the hinge operation.