Bought one of these knowing I wouldn't get much for a hundred bucks, but it seems to have decent enough bones. Figured I'd probably have a go at... overclocking it Having known of the existence of aftermarket RC motors since the 80s, and how much difference they make (and that was before brushless!), I've had the idea to hot up a cordless gizmo with such a motor for ages, since I realised many of them use the same size motor. So anyway, it's time. This thing is 6s, 2.2Ah, with a 120W 545 motor, which was specced with advanced timing (there are three adjacent notches in the end of the can to hold the end cap in different places). Not sure what rpm it runs at, but it's good for about twenty minutes at full power. I figure a more efficient brushless motor running at like 250-300W might give it some proper grunt if there isn't too much flow restriction. The plan is to use my 3p5s/15s DeWalt FlexVolt batteries with it, which are 6Ah/2Ah. I'm assuming it makes a lot more sense to use them in 5s rather than 15s, but correct me if I'm mistaken... Anyway, I'm hoping for at least about half an hour from these batteries. Can anyone tell me the disadvantage of sensorless motors? A vac would seem like a fairly undemanding application; I'm guessing I can totally get away with the cheaper option, right? For the controller, I found this: https://www.ebay.com.au/itm/295865099072 Seems hard to go wrong for $20. This would be suitable, right? As for motors, it seems a 3650 is the go. I get winding specs but not kV, not sure what that's about. Can't be actual kilovolts, can it? There's no way the tiny SMD board in my little drone is handling 11,000V with those tiny spark gaps...? I found this page about speccing a brushless motor, but couldn't make enough sense from it. As for number of poles, I'm guessing I don't have to worry about that since the cheapo motors I'm looking at don't seem to offer different options. Then I just grab a DeWalt battery clip and get hacking. Hoping I can get enough knowledgeable peeps to chime in to help me figure out the spec I need for motor and controller... For under $65 plus BYO tool batteries, this project seems pretty worthwhile, and probably quite applicable to similar gadgets. When the bits arrive I'll post a step-by-step for posterity.