The draft of the new frame.

I have started the construction of a new frame for the "quadcopter". In this frame the propellers, engines and components are within the frame, to prevent them becoming damaged if a crash happens. The new frame shown in the Figure in an initial state, it is made of carbon tubes (4mm in diameter) which are connected by connectors used in kites. As I could not find connectors for the corners, I did them by myself using aquarium tube. However this tube is flexible and therefore it not strong enough to be used in the new frame. So I will have to find out another way to connect the corners of the new frame.