Giant Scale 3D Plane Scrathbuild

[BoredGuy]

Torsional rigidity is very important but luckily it’s easy to accomplish with basic wood construction techniques.

For this plane the torsional rigidity comes from the balsa skin. It’s similar to the semi-monocoque construction of many full scale aluminum kit planes. Basically the formers and stringers define the overall shape and the skins carry a lot of the flight loads and provide stiffness. This works especially well on curved surfaces such as the leading edge of the wings and the fuselage turtle deck. View attachment 196446 View attachment 196447 Many wooden planes (RC and full scale) have sheeting over the leading edge of the wing that stops at the spar. This sheeting and the spar shear web creates a closed box in the shape of a D. That’s where the term D box construction comes from. It is very strong and light.

To create a rigid structure without using any sheeting, webs, or large gussets you need trusses. Trusses carry compression and tension loads. Truss style construction is the lightest way to build a balsa plane. You will also see it a lot on steel tube fuselages common on bush planes.
View attachment 196448 View attachment 196450 View attachment 196449 Trusses can also be applied to wings. View attachment 196453 Or even designed right into the ribs in the form of geodetic construction. View attachment 196454

Those pics are beautiful! Thanks for such an informative post!

 

[hsquier]

Same as BoredGuy.
These pics make me the feeling of a royal flush showing down one card after an other.
Sort of scratch RC knock out.
After this how could you expect us (in any case me) showing our work ? uh ?