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Re: SEAPLANE TENDER, CHANGE OF ESCs
Hi Peter, yes I cool the motors with
brass tube coils
and water pump. I'm not sure if they even get hot as I never tried without them. I work on the theory, 'put everything on you think you might need and if you don't need it you can take it off' I don't prop the motors too high,- rather let them rev higher with less pitch, thereby taking the load off the motors.
The motors are 540 45 turns which is sort of 'low gearing, high torque' so they are not straining. I could put on much bigger props and make a speedboat out of it, but it wouldn't look right. Batteries are only 2s 2200 MAh and last for over an hour, so motors aren't sucking many amps.
I use 2 12V 385 motors in the MTB with no cooling other than clip on heat sinks and a computer fan blowing air through the boat, and they've been running for years (get that hot you can't touch them) with no probs. Just keep the bushes oiled now and then. These are so cheap they are not worth worrying about. With fans and ready made water cooling plates available these days for ESCs etc there should be no overheating probs, and most ESCs have temp and low voltage sensors and cut out if they get too hot, or with low voltage, (if they cut for temp reasons you know to up your cooling or unload the motors) The modern boat/car ESCs are pretty much plug and play, - auto cell count sensing( LiPos), auto throttle centering etc)
Still using a 70's 20A Futaba marine ESC (in the Fairacre launch) which is as good as any similar unit today. Just plug any 12v battery in (no need for cell counting LiPos) and away you go. Was used on 27MhZ but now used on 2.4. Also used an Electronize unit,- nice but huge and makes an annoying fizzing sound going slow so I replaced it.