Hudy 30mm Brushless Cooling Fan

I've purchased several, at least 10. The first 3 were like the one shown in the picture, and didn't even include +- indicators. Later orders the fans came +- indicators, and even later orders even having the leads soldered on. The last time I raced I threw out 4, after repeatadly switching them out as one would work, then stop working during a run. It was then I realized that it wasn't shorted or bad leads, it was something to do with the circuit board. Putting a little pressure on the circuit board would cause the fan to start running, like a car's throttle pedal. I've tried many brands of fans, and these are better than many other brands (at least they would last a while and not lock up the first run or first day). But my search will now continue as that became unbearingly frustrating and of all the worst fans I've had none have ever developed that issue. Especially 4 fans which all ended up having the same testable issue.

It may be a perfect fan, but I looked at the plug and didn't see a polarity. I should have seen the polarity was on the fan terminals and I trace the wires. My bad! I'm sure it would have worked fine if plugged in correctly. The plug needs polarity on it! It will melt if you plug it in backwards!!!!!

The fan stopped working after 3 minutes of practice time and 2 heats, you do the math. Yeah! equals no main.

Junk son got in small crash and fan came apart JUNk