So I'm going through my collection of motors, testing and maintenance on them, and have a few different winds to them all. I have a Traxxas Stinger 20 turn Single wind a Chameleon 19 turn single wind a Venom Fireball 17 turn double wind and a Duratrax Photon Speed 20 turn single plus a few other 540 can 27 turn motors, and somewhere I should have a 13 turn double wind. I did try out my reedy radon 17 turn double wind and that is no good. anyways, how fast is too fast for a bilge pump. At some point I'd guess that the performance starts to decline because of cavitation. but would the 17s be too much? I know a lot use those 20 turn stingers, so with some luck and elbow grease, I should have 2 good 20 turn singles.
Anything north of 50,000 rpm creates durability issues with my pumps. BC pumps are similar but larger in size so probably slightly lower top end like 40,000 rpm. The sweet spot when I design a pump is about 30,000 rpm with a impeller diameter of about 27 mm.. View: https://www.youtube.com/watch?v=T31rPx4fVNA&feature=youtu.be
words per minute? So it sounds like the 17 turn would be a major upgrade then. I have one that is junk and that said it was a 30,000rpm on a 7 cell NiMH. I'd assume a similarly built motor would be the same. I'm running at 6v, so it would spin at a lower RPM of course. I could probably go with a 15 turn, or maybe that 13 turn if I can find it. Guesstimating based on the RPMs of the 17 turn, a 15 or 13 should be fine at the lower voltage. I have yet to buy batteries, so I may step up to a higher voltage when the time comes. The motor I have in it now is only 8000rpm at 6v IIRC.
Ryan once tried to use a Fireball motor at 6 volts. The #14 wire got so hot at the motor they unsoldered themselves. We put things back together and ran a test with an amp meter. Maxed out the 50amp meter so I’m not sure what it was pulling for amps but the wire did burn my hand. Stingers are fine. Use that.
Highest I have built is 76 amps at 4s (57,000 rpm, 3.5 gpm), not durable at all. But it didn't do that much better than a motor of much less power, 30,000 rpm. Printed impellers or CNC cut Aluminum or lost wax cast is where the fun is, motors are what they are , some good some not, buy one try one. Or go by info from users? I have about 35 lbs. of motors sitting in a draw, some good some not, welcome to the hobby! Again a "three bears thing".
The screaming sounds of demons being contacted from another dimension scares me. I tried one of Carl's higher KV pumps and the neighbors grew concerned over the dark rotating vortex over the neighborhood.
