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Hi Wojcigitty,

Carbon fibre strips are relatively inexpensive and I am not talking about using much in this design. I suspect that no matter how fast the plane is moving designs like the Addiction and E-Shock experience far more twisting of the control surfaces than the human eye can resolve. I should think that captured on a slow motion camera we would all be surprised by how much flex there is.

The ailerons and tail surfaces are only 1/8" thick on my design and so creating a structure that does not flex is very problematical.

Before you congratulate me I must say that I cannot agree with you about triangulation not reducing torsion - I am afraid that I believe it does, but it won't eliminate it altogether and requires applying correctly and with the correct cross-sectional shapes, i.e. at least a 2:1 aspect ratio running in the correct dirctions.

The conclusions that rcpilot82 and I reached were based on using 1/8" sq. balsa strips to form the triangles - this is next to useless on an aileron so large and so thin and just adds weight. We cannot eliminate the flex totally but hopefully we might reduce it without too much effort. In truth to get the most rigidity we should have another set of cross members working in the opposite corners to the ones shown so we would have 4 triangles in each section - but that is getting a bit complicated. Perhaps you are right that the complication is uncessary. Do you still think that it is not worth the experimentation?

Please see the attached pictures of Sir Barnes Wallace's Wellington bomber. He was a master of the art.