Re: Interplanetary Hellicopter
The rotors will have to be larger to compensate for the thinner atmosphere but not proportionally larger because of the reduced gravity on Mars.
We know they keep a duplicate rover on Earth so they can test it. I don't know how they can replicate the conditions to test a Mars helicopter. Perhaps they will run it in a semi-vacuum while suspended on a counterweight to simulate the reduced gravity?
As all scientific and engineering knowledge on the planet is contained in the heads of the El Reg commentards perhaps someone could enlighten me.