Cold air == improved density-altitude, and so it seems likely that it would. :)
One really cool characteristic of a tetrahedral wing flying machine would be that it would be pretty easy to make it collapsible/foldable... How about a man-carrying wing that you could fold down to backpack size? :) :) :)
Guess that's why they're all wearing jackets! A backpack that could unfold into a flying device like this one would be incredible! Maybe one day... :)
:) :) :) :) :) :) :) I want one! ;)