Yeah! It is flying! But the missing rigidity of the frame seems to be a big problem. Every time it lands, the motors turn slightly. As a result the copter is constantly yawing with different strength/direction. Tuning the parameters of the KK2 board is not possible and makes no sense before the motors are better fixed. We also thought that the vibrations of the copter may disturb the KK2, but it seems fine if we damp it just a little. The swinging right and left of the copter was probably a result of too wobbly damping (really not sure about this).
I will upload a short video here soon.
After a few hops on the grass it finally happened: The copter rolled to the side and smashed into the ground. Surprisingly the only damage was a bent aluminium tube and not as expected a broken prop or shattered PMMA parts. Unfortunately testing was still over.
By the way, take care of the direction of the props! One prop has already a small crack because I forgot to check the rotation direction of the two back props. The copter nearly flipped when I tried to take of.
By the way, take care of the direction of the props! One prop has already a small crack because I forgot to check the rotation direction of the two back props. The copter nearly flipped when I tried to take of.
Next step is to improve the rigidity and some other minor things. Right on the way home I bought some aluminium square tube.