Good luck.. the highest atmospheric density on Mars is equal to the density found 35 km above the Earth's surface

I think a latex balloon filled with hydrogen could achieve positive buoyancy. Just bring a little bit of water and you can make your own hydrogen.

I don't know of many latexes that are springy at -100 C.

Touché. See Camper Bob's response for something that would make more sense.

It wouldn't have to be latex. What's wrong with mylar?

There is, to a first approximation, no atmosphere on Mars. To a slightly better approximation, there is an atmosphere on Mars, but only enough to cause trouble, not enough to actually be useful for anything.

There's enough atmosphere for Nasa to seriously consider deploying airplanes: http://en.wikipedia.org/wiki/Mars_aircraft

We've had the discussion: https://news.ycombinator.com/item?id=4261806

A cessna would need wings as large as a 747 and be traveling about mach 1 to take off, iirc.

Thats an awesome metaphor! Going to use this one, thanks.

So it would need wings that have ten? times more surface... that doesn't mean this couldn't be done using small scale drone designs.

Mach 1 where?

Mach 1 always means the speed of sound in the local environment.

On Mars. Mach, the speed of sound (vibrations), varies with changes in heat, density, etc.