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If you are going to do it don't do what this guy did.
He took a rubber band plane and basicly converted it with bit charge bits. This is all wrong.
For a start he's using a wrong prop, the one he is using is designed to be turned by a rubber-band and when you bolt it to a char-g motor its spinning to fast to generate enough power due to the wrong angle of the blades. You can get micro props which will generate more power but be smaller.
secondly his way of controlling is all wrong.
He is using the rudder to turn the plane, why I don't know. The most efficent way would be to use small linkages to lift and lower aerolons on the main wing. This would mean if you turn one way the plane lifts one aerolon and drops the other causing the plane to roll.
If I was going to do this I would utilise a bit-char-g/bit racer hybrid. This would mean the prop is on all the time and I would use the forward/backward control to move another two control surfaces up and down ( by using another magnet and coil set) to give me pitch control. And then build a dedicated air frame around it out of thin balsa sheet and doped tissuepaper.
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