This is the Yeah Racing 40x40x10mm Tornado High Speed Cooling Fan in Black color. This fan features dual ball bearings and is great for motors, ESC's and multiple other applications. This fan is capable of use with a 2S LiPo (8.4V), but no higher.
Fan Size: 40x40x10mm
Operating voltage: 5-8.4V
Start-up voltage: 3V
Material: Plastic Blade and Frame Housing
Bearing: Dual ball
Shaft Core: Stainless steel
Wire Length: 250mm
High air flow and wide range of voltage
Fan didn't turn, but motor got warm.
Had to throw away without any use.
Should have known better. Other Yeah Racing products I have purchased have failed prematurely.
I'm glad I'm not sitting next to it while operating. it's very loud. I wont be able to hear it over the sound of my 700 class helicopter, but it's going to keep my ESC cool, that's for sure.