Wooden structure reinforced with carbon fibre

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Oct 18, 2003
Saline Michigan
How would this work?Wrap a center section with x layers then add a section at each and continue wrapping y layers then add another section at each end then wrap z layers.This gives more thickness of spar in the center section and progressively less towards the wing tips.
Edited -Sides covered with carbon at +- 45 deg
View attachment 116356
Well, my guess is that you have never tried doing this sort of thing. With the exception of table rolling round or elliptical sections, everyone I know has trouble with wrinkles and bubbles when they attempt even a full circumference of the part in the small dimensions - around the cross section. Start talking about making the circumference the long way on the part... It just has to be a process nightmare.

Going further with the idea, the author seems to think that we build a web separate to the rest of the spar. We don't. Webs must connect to the caps strongly. So webs are typically laminated with spar caps and web core all present in a jig or mold, and the webs must lap onto the spar caps from the inside or around the outside or both. This scheme would not handle the strong connection of shear web to caps...

One other point. Tailoring the shear web to the shear loads is done simply by laminating more shear web plies where there is more shear load and less plies where there is less shear load. This is why we start beam design with the plots for local load, shear, and moment under each of the loading conditions, and pick the most severe for design. Then we can tailor the sections to the loads...