ESC Cooling Concept- Theory and Practice

[m4a1usr]

Bringing back an old thread is a good thing. Always helps to remind folks of whats been covered and dont bother rehashing something clearly previously defined.

There is no way any design could put the media we run in, water, in direct contact with the FET's. The reason is simple. Corrosion. When electricity is passed thru conductors it forms what is known as galvanic reaction. The reason is because water is composed of many properties. While in its simple form (h20), there will be less reaction, the problem arises when contaminates form bonds and allow precipitation of chemical reactions due to those individual chemicals. Pure water is not our media. We run in water with many contaminants. And the chemical make up depends on what part of our nation or global location you are situated in.

John

[AndyKunz]

Oh man! I ran at a SAW event on Long Island a while back (setting a P-Hydro record at 39 MPH - stop laughing, it was fast at the time!). I had buffed and polished props. Problem was, after a single run they would be dingy brown! The steel shafts had rust spots on them where before they were shiny. This is after maybe 10 minutes in the water!

The shore had needles and assorted garbage all around it. Pretty trashy place, imho. I did get to see a Concorde landing while I was there. That was pretty neat.

Andy

[haidiacr]

Good to know you can bring up old threads here. I see your point about corrosion, the reason i brought it up is because this reminds me of the time i was in to oc'ing computers. And with watercooling the efficenciy of the heat exchange between the cpu and the water was the key factor. But forgot that cpus had heat spreaders and the liquid used was designed to prevent corrosion. But still most of the theory should apply here too, you could build something similar to the copper block at the bottom of this pichttp://www.build-your-own-computer.n...cooling-03.jpg And get even lower temperatures, but the cooling boxes will heat up faster

[Jeff Wohlt]

Looks like more intesest in this...Dr. Wayne. Smaller nitro tank and then fill system alll the way thru so it is full and purged. Add ice chunks and start pump. Very easy idea and works. Read this thread.