is it necassary to water cool an outrunner?

[ls1fst98]

I thought i read on here but cant find the thread, thought it didnt make a noticeable difference in temps of an outrunner with or without a watercooled motor mount.

[Doby]

Not necessary, but it can't hurt.

[forescott]

I think water-cooled motor mounts are a joke. Your just cooling the base plate of the motor, as opposed to the entire surface area of the motor can in an in-runner with a cooling can. An out runner needs airflow. They are great performers, but not the ideal choice for a boat that requires a sealed, water tight hatch.

[ls1fst98]

thats what i thought. i have a daytona that im building and have watercooler mounts but i dont like how they sit. looking at making cf mounts then if i decide to change the outruner to inrunner its not a big deal. does anyone make cf motormounts for the fc daytona?

[785boats]

I think water-cooled motor mounts are a joke. Your just cooling the base plate of the motor, as opposed to the entire surface area of the motor can in an in-runner with a cooling can. An out runner needs airflow. They are great performers, but not the ideal choice for a boat that requires a sealed, water tight hatch.

I'm afraid I have to disagree with some of that statement.
The motor windings are attached to the base plate in an out runner. The windings are what create most of the heat. The heat transfer to the base plate & then to a water cooled mount is quite considerable. Better some cooling than none at all. With no water cooled mount, the heat stays in the windings. The spinning can does create some airflow which helps cool the magnets.
But yes, a cooling can on an in runner is much more efficient, that's for sure.

[T.S.Davis]

There was a guy that was running outrunners on his tunnels that used to pump water right into the motor. I think he was basically drilling a cooling tube through the face plate of the motor and pumping it in. He swore by it but I can't vouch for it myself.

[ray schrauwen]

It's possible since you can run brushless motors underwater to a degree.

[ls1fst98]

That idea of pumping water on it just sounds like a horrible idea. Lol electricity and water, they don't mix to well.

[ray schrauwen]

Water is mixing with metals and magnetic flux not actual electricity. All you have to do is keep the metal from corroding with corrosion "X".

Try pouring a bottle of spring water into a container and use it as a conductor in a DC electrical cct. You will find there is little or no performance. Salt water will be far better but plain water is not a great conductor even if there was electricity running across the gap of a brushless motor it's not actually conducting anything. The copper wire is insulated and the magnet is not bare.

[NativePaul]

A buddy of mine used to leave the motor compartment of his speed700 powered riggers open to the elements for good air cooling, and a very fast cool down when it come of the plane at the end of the run instead of heatsoak building the temprature further, it should work fine for outrunners too, but I would rather use an inrunner myself.

[T.S.Davis]

I used to run my 700 motors in a glass of water on 7.2volts for break in. Seems crazy now but it felt like it made a difference.

[gsbuickman]

I used to run my 700 motors in a glass of water on 7.2volts for break in. Seems crazy now but it felt like it made a difference.

Your right T.S, i do the water break in on all my brushed motors. It does make a difference & the brushes last longer. I got a a Cordite 700 class & an Astroflight ESC recently. I am thinking of pulling the k.o.s .30 nitro out of my vintage 30" shovernose, and swapping in the Cordite on 4s after I do the water break in on it. This way it still has vintage flair .....

[daveives]

There was a guy that was running outrunners on his tunnels that used to pump water right into the motor. I think he was basically drilling a cooling tube through the face plate of the motor and pumping it in. He swore by it but I can't vouch for it myself.

I have been running water injection for about five years and love it. That is the only method known that water cools both the magnets and the wire coils. See some of my comments at:

http://forums.offshoreelectrics.com/...ly)&highlight=

[forescott]

I'm afraid I have to disagree with some of that statement.
The motor windings are attached to the base plate in an out runner. The windings are what create most of the heat. The heat transfer to the base plate & then to a water cooled mount is quite considerable. Better some cooling than none at all. With no water cooled mount, the heat stays in the windings. The spinning can does create some airflow which helps cool the magnets.
But yes, a cooling can on an in runner is much more efficient, that's for sure.

I agree to an extent they do something, but it seems kinda silly, all that hot air circulating around inside the hull just getting hotter. I think if your gonna run an outrunner, you need a vented hatch, really well waterproofed electronics, and just try to keep it prop side down.

[Fluid]

Strange, I've run a large outrunner in a sealed hull for years without problems. It's a SprintCat 60/80 running a Scorpion 4025 on 6S with a small computer fan circulating air around the hull. Works fine for one mile heats in hot Texas Summer weather. Experience trumps theory.



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