Carbon Strip Thickness for Foam Wing Reinforcement

[Silkestra]

Hi,
I’m working on a VTOL drone project and want to reinforce a foam wing for an experimental prototype.
The wing has two halves, each 600 mm long, and I’m considering inserting a carbon strip along the leading edge of each half to function as a spar.
What thickness would normally be a good starting point for this kind of reinforcement, 0.5mm, 1 mm, 2 mm, or something else?
Thanks!

 

[Wayne]

Typically we don't put the spar at the leading edge, but closer to the CG location when using a single spar. For example, here is a picture of our flying wing with a strip spar, the curved black thing.

Why a curve? It keeps the spar in tact, cutting it at the center would make things very weak. The Cg of this wing is a little behind the spar location at the center of the wing. Oh yeah, these are 1mm thick carbon strips. We have used anything from 1x3 to about 1x6 for this combat model that has a 48" span. 1x3 is plenty IMHO, and will do well for your smaller model too.

 

[Silkestra]

Hi Wayne,
Thank you, this is very helpful advice.
The picture does not seem to load properly for me, though. Would you mind trying to resend it? It would be helpful to see what you mean by the curve.
Thanks!

 

[Wayne]

How about this one: