Mixing construction materials

Earlier, (Neal Fulco) wrote:

I was wondering if some weight
could be saved by making a wing
with a carbon fiber spar ( high
strength, light weight ) with
aluminum ribs and skins.

I'm pretty sure a way can be found to make it work. But one awkward
aspect is the mismatch in Young's modulus between the spar and the
skin. See my earlier post on this topic:

http://groups.google.com/groups?hl=e...g.goog le.com

[Huge nasty Google link. Must be all on one line.]

Thanks, and best regards to all

Bob K.
http://www.hpaircraft.com/hp-24

(Bob Kuykendall) wrote in message . com...
Earlier, (Neal Fulco) wrote:

I was wondering if some weight
could be saved by making a wing
with a carbon fiber spar ( high
strength, light weight ) with
aluminum ribs and skins.

I'm pretty sure a way can be found to make it work. But one awkward
aspect is the mismatch in Young's modulus between the spar and the
skin. See my earlier post on this topic:

http://groups.google.com/groups?hl=e...g.goog le.com

[Huge nasty Google link. Must be all on one line.]

Thanks, and best regards to all

As luck would have it, the day after I made this post, I received my
copy of Custom Planes which had an article about a modified Sukhoi
that had a carbon fiber spar with aluminum ribs, but it said it had a
composite skin.

Neal

Bob K.
http://www.hpaircraft.com/hp-24