Planet Explorers isos

The Eurocopter X³ (X-Cubed) is an experimental high-speed compound helicopter developed by Airbus Helicopters. A technology demonstration platform for "high-speed, long-range hybrid helicopter" or H³ concept, the X³ achieved 255 knots (472 km/h; 293 mph) in level flight on 7 June 2013, setting an unofficial helicopter speed record.
This is a unarmed model for planet explorers. It will be folowed by the X² using the same airframe but with coaxial rotor (and armed)

Download X3 Cube in 5 sec