Oring for a 40-42mm motor

[BashingBrian]

That's the best, not having to rely on fans! I have a couple setups that don't ever get hot even without them. That peace of mind is priceless IMO.

Currently not one of my RC's has extra fans..!! well nine of them I think

 

[KnowAir]

Currently not one of my RC's has extra fans..!! well nine of them I think

No motor fans? Impressive. I try to avoid using them as much as possible, some just run too hot without..if I can't get satisfactory speed without the motor getting hot then I'll add them. Zipties baby! Until this topic came up that is.. now I'm thinking why not just use oversized O rings to cushion the motor AND hold the fans?! Genius!!