Therefore there is no reason to expect it to achieve sustained flight at any significant altitude on Mars. It would perhaps hop off the runway, then settle back down, hop, settle, hop, settle. But wait! I forgot there is no 3-mile long runway on Mars. Also, the Helios has a 2000 pound mass, and a wingspan over 200 ft. It would be hard to get it to Mars in the first place. A balloon would be easier, but I'm not certain if a balloon could fly in Mars' atmosphere either.

Mars Entomopter would mass a mere 30 pounds, have a 3-foot wingspan, and could take off and land on a dime. The leading-edge vortex attached to flapping wings under low-Reynolds Number conditions (thin air) would generate 5-times as much lift as comparable fixed wing airfoils, allowing flight on Mars.

The space program has been a bit boring lately, but an unmanned Mars Entomopter would be a neat trick. It's got both novelty and scientific potential going for it.