Watercooling finned motors?

[detox]

I seem to get cooler motor temp readings whenever I use the homemade 5/32 aluminum tubing version. If need be...water flow can be slowed rather easily by using some type of restriction inside tubing or by crimping tubing.

[Steven Vaccaro]

I seem to get cooler motor temp readings whenever I use the homemade 5/32 aluminum tubing version. If need be...water flow can be slowed rather easily by using some type of restriction inside tubing or by crimping tubing.

So you are getting better temps with a coil? Any water jacket I have ever tested is far superior to a coil. If not there is a problem somewhere. When I first started OSE I did bench testing between the Gundert jackets and coils. I dont remember the exact numbers, but the coil wasnt even close. The jacket allowed higher amps for a longer period of time.

[Flying Scotsman]

I seem to get cooler motor temp readings whenever I use the homemade 5/32 aluminum tubing version. If need be...water flow can be slowed rather easily by using some type of restriction inside tubing or by crimping tubing.

Put a full cooling water jacket on and then a tubed system. If you are getting lower temperatures with a coil system. I guess physics do not count.

Douggie

[detox]

Since the motor magnets are most effected by heat, wouldn't the motor shaft and bearing area of motor be the best area to get infrared temp readings from after a run?

[detox]

Using water jacket...if water is not transfered efficiantly or fast enough around motor case wouldn't the water inside jacket and jacket itself hold in heat?

The water jacket theory makes perfect sense if it is done correctly.

[AntronX]

Water jacket would interfere with heat transfer if water flow is lost. That's why you have to mount water exit nozzle where you can see it while running the boat. I don't worry much about heat transfer efficiency. As long as there is nice little jet shooting out of the nozzle, it's good enough. Ideally, you want your magnets to be as cool as possible. The hotter they get, more of their magnetic flux is lost. That means less power at the prop. So I don't bother using infra red temp gauge. I just feel how hot the case and bearing get with my hand. If it's too hot to hold, then it's too hot... My watercooled 1515 comes back just warm after a run.

[bustitup]

That sounds good! I think I'll try the O-ring/jacket idea first. If not, then I'll fan it.

What do you think of this Castle 2200kv motor in a PB Thundercat 31 convert? on 4s or 5s? Got the hull for free, I figured I'd try it out, and see what I can get from her.

I have the very same motor I was going to use in my newly aquired mean machine on 4s...did you eve get r a fix for the watercooling on this motor

[Jim Bob]

[QUOTE=ED66677;68499]Higher water flow doesn't necessary meens better cooling! the heat exchange process between motor and water requires time! too much flow means not enough exchange time!

Not necassarily true. The formula for refrigeration tonnage is:
Temperature differential x gallons per minute /24
example:
2 degree temperature differential x 12 gallon per minute/24= 1 ton refrigeration.

1 degree temperature differential x 24 gallons per minute/24= 1 ton refrigeration

Same heat reduction different flow rates. The optimal idea would be to increase flow rate while maintaining temperature differential!

[bustitup]

I did it with a kb45 cooling jacket and o-rings

[paulwilliams]

You could fill the fins with electronic heat sink compound and remove the air gaps. A coil would then work ok.

Paul

[crrcboatz]

I may be way off here but why couldn't a person, using their dremel or such, cut a path from one end of the fins to the other. It would be sort of a trough that let the water travel between the fins to the exit nipple. Water would be forced to leave through the trough to the other end would circulate the water in the process. Each fin would need to be cut so as to allow the water to pass to the next. Sort or like a maze path. Flow rate would depend on the size of the cut of each notch in the fins. Pressure would force the water to move in a circular path to the next cut and water would work its way to the exit nipple. If you used this method with a cooling sleeve what would be the down side of such a method??

Curt

[Punisher 67]

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