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At 0:23 we hear a crack, and the motors make a different noise. Sound Like a broken prop? The octo compensate till motors get to hot and then the multi crash?

If it is not a fake : The S800 with frame, motors (etc... ) weights 3,1 kg. So with 6kg, let us imagine They take the landing gear and 2,5 kg of LIPO (and then we have the 6 kg take off weight). The frame has a diameter of 800 mm. So the propellers are 13". I put all of this in ecalc : For the...