Multiwii Dualcopter

Multiwii Dualcopter with Improved Maneuverability

Thrust Vectoring Multiwii Dualcopter

Multiwii Dualcopter With Thrust Vectoring Coaxial Motors

Rubber Powered Helicopter -- Maiden Flight

MORE:

Sprite Drone - Kickstarter Tech

Coaxial DualCopter flight success video

Coaxial Bicopter