The Upside Down Helicopter
This is the remote controlled helicopter that can fly upside down. Its two pairs of contra-rotating coaxial main rotors unclip easily from each swash plate–when inverted and reattached, the rotors provide the same amount of lift and gyroscopic inertia to keep the helicopter balanced for up/down and left/right flight.
Subscribe now to our FREE newsletter!
Subscribe NOW to Gadgets Matrix weekly newsletter! You will receive the weekly selection of the best gadgets!
It is FUN, it is COOL, it is Gadgets Matrix newsletter!