ORIGINAL: branded
ORIGINAL: Rcpilet
I can't cover well enough to keep the helium trapped inside for any length of time.
Well, please revert to your H.S. Physics....When you add "anything" to a container, this time a wing cavity pf a given volume, you displace the air inside with that "anything".....
Given the geometry of the wing is fixed, you can either displace the air with spars/wing ribs/shear webs, or spars and foam....either way your filling the space with "something"...and yes, air does have a weight....
Cheers...
I concede your point. Air has weight.
But, your not acknowledging my point.
Air is lighter than foam.
I still like built up wings better. I think they are lighter. A foam wing is easier to repair though.