> It looks like a closed edge biplane when it transitions.. the closed edges help efficiency Perhaps. It could also be mostly to stabilize the aircraft in forw

> It looks like a closed edge biplane when it transitions.. the closed edges help efficiency Perhaps. It could also be mostly to stabilize the aircraft in forward flight, since that's more efficient by itself with a "pulling" rotor than a traditional quad-copter setup (using differential thrust from each motor to control movement and stability). The closed wing doesn't look very large, so we'll have to see just how much lift they actually get out of it. The airfoil design may not generate much or any lift but instead just be used for control, such as a typical horizontal/vertical stabilizer of an aircraft. Or perhaps it does generate some lift and helps a bit. Just looks rather small for that role, but I could be wrong. RC aircraft often defy principles that apply to their full-sized brethren. > (FTA): Amazon declined to release some specifics on the device, citing trade secrets I guess we'll just have to wait for some more specifics.