JimD
50cc
If you have this model, or have seen one up close, you may have noticed that there are preinstalled mounts in the wing panels for flap servos and covers for these are included in the kit. We have modified two sets of wings to add flaps with great success. The first wing we tried this on was interesting because we didn't know what was inside or where to cut. After that adventure, the next wing was easy!
Basically, measure 6" forward from the trailing edge and draw a line with a fine point Sharpie marker. Measure 4-7/8" out from the wing root and draw a line. Now cut along these lines with a razor saw. there are areas inside that have balsa blocks and will be harder to cut through, so be prepared.
We used Robart 3/16" Super Hinge Points (8 per flap) with the shaft of the hinge entering the bottom trailing edge at a 45 degree angle. This allows for greater than 90 degrees of flap deflection with no problem. We ordered the Linkage Set (part # HAN107012) and used a set of the pushrod hardware to operate the flaps. This looks nice, works well, and matches the other pushrods.
By carefully cutting, we were able to save the covering on the main part of the wings and slip our added covering in under the existing covering to finish the wing modification. We stripped off all of the covering from the flaps to make the internal modifications. Several extra ribs need to be added and a section for the flap control horn mount.
Here is a photo essay of how we did the modification:
Basically, measure 6" forward from the trailing edge and draw a line with a fine point Sharpie marker. Measure 4-7/8" out from the wing root and draw a line. Now cut along these lines with a razor saw. there are areas inside that have balsa blocks and will be harder to cut through, so be prepared.
We used Robart 3/16" Super Hinge Points (8 per flap) with the shaft of the hinge entering the bottom trailing edge at a 45 degree angle. This allows for greater than 90 degrees of flap deflection with no problem. We ordered the Linkage Set (part # HAN107012) and used a set of the pushrod hardware to operate the flaps. This looks nice, works well, and matches the other pushrods.
By carefully cutting, we were able to save the covering on the main part of the wings and slip our added covering in under the existing covering to finish the wing modification. We stripped off all of the covering from the flaps to make the internal modifications. Several extra ribs need to be added and a section for the flap control horn mount.
Here is a photo essay of how we did the modification:
