Markus As an update after finally using them on a quad, 2S Toothpick style - the good news is that the fly decently, and apparently not much less efficiently than the motors I used before (HM1102 9000kv).The bad news is that soldering the wires on was not a nice experience. The motor wires of these motors have only two internal strands in the core, break really easy, and the insulation is not silicon, so it melts under heat. I lost a few mm of wire on one motor two times, now having a motor wire that is actually quite a bit shorter than optimal for the build.