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Hello ! I have made this skycrane for a contest on TechLUG. The objectives were : Have a mechanism for the rotation of the rotors A host mechanism The helicopter must can catch a container It can have a motorization with a battery box and a M motor for the rotation of the rotors ant the host mechanism We had a maximum of 900 parts I chose to make a gearbox to have the possibility to choose between the rotation of the rotors or the host mechanism. The gearbox is activated by a crank. There is a linear clutch to have progressive acceleration of the rotors and to secure they when the M motor is turning. On these pictures, you can see the rotors mechanism. Here, the pictures of the host mechanism. The clamp is openable by a little mechanism. The motorizatioon can be add in the cab, by removing the interior. It is not the best solution, but there is not space is this helicopter. (You can see it in the video) For the design, I choosed to have a thin fairing. The advantage is the helicopter is more resembling reality ; but there is little place for the mechanic. There are just 2 seats in the cab. A made a detailled turbine. It is imposing, it released to the fairing.