The unique flight conditions of flying at a very low temperature, density, and pressure. Being a secondary payload for a Mars mission and fitting in a CubeSat greatly constrains mass and volume budget. In order to have reliable laminar flow and experimental airfoil data, need to increase Reynolds number as much as possible (current target Re=20,000). Need to remain subsonic and keep wing loading low. Extremely harsh temperatures for both Earth and Mars flights, must insulate/heat batteries and electronics. Flight testing requires telemetry and broadcasting systems required for much larger vehicles, miniaturization work underway.