make to see and what the position is the engine is closely guarded secret. bird fly basically is based on two different motions so it's like a rowing boat so what you have this you don't only have the motion of a lot of people think the birds do like the up and down movement but you also have the movement that's like a rowing boat so a little bit like this and so what we really want is that the wing. can make a flexible motion so it should be able to really move like this so those motions are really needed for flapping wings light. the engine is soon found out that attempting to copy nature brings its own challenges for an airplane for example with this very easy to make a small scale model and the put it in the wind tunnel and then to calculate everything that this related to the aerodynamics before bird this is difficult