Best water pick-up ever!

[FRED]

water pickup

nothing

[mm123521]

Fred:

I started running water cooled RC boats 15 years ago.
I am 60 years old, so I guess I been around the block also.
I have studied all the science behind water cooling and have done it on an industrial scale.
If I could have restricted the water flow on that $1,000,000 project AND improved the cooling, I could have saved $200,000 in pumps and pipes. But it just doesnt work that way.

I have adjusted flow rates on that industrial cooling system and observed temperatures, so I also have first hand, practical, experiance that validates: More water flow= better cooling.

We would get zebra mussels (little clams) that clogged up the pipes and restricted the cooling water flow and the temperatures always went up as the water flow choked down. When we cleaned the Zebra mussels from the pipes (increased the water flow), the temperatures always went down.

I am 100% sure of what I say, as I have book learning AND practical experiance.

Its exactly the same principals: RC boat or industrial water cooling.

Mark

[Brushless55]

Funny how this thread had gone
how about we use what works for us?

bottom line.............................................. .....................
if a motor is getting very hot then the setup is not 100%

[wild bill]

just get a heat gun and pick a target temp you want.(heat you want for your application)simple!

[ManuelW]

@ Fred:
Well, so you want to talk about my experience with FE boats? Well I might have studied and I'm quite young as well (23 to be honest), but I think I have already more experience and knowledge than most others.

And comparing apples and oranges: You compare the experience of a guy with 1:1 cars racing to the cooling system in our boats?
To explain it as simple as possible: They "reduce" flow to increase pressure and therefore avoid that the water in their closed-loop cooling system boils, which would be absolute horror. Normally water boils at 100°C, but like in a pressure cooker under pressure it will boil much later. And thats why they make it. Otherwise the water will boil in certain hot parts and cooling power will there decrease dramatically, resulting in blown engines due to overheating.

We wether have a closed-loop cooling system nor problems with boiling water (if so, get a bigger engine and ESC or rethink your setup ;-D ), therefore its just a completely different story.

I just want to help with my knowledge and experience, that's why I absolutely recommend to increase flow as much as possible. And only because something was done so for ages, it doesn't need to be the best solution.

Best regards,
Manuel

[igottalongone]

ever see someone drill a hole in steel?
remember the little spout running coolant on the bit?
that cools as fast as it touches the bit, and falls away instantly.
the contact time with the bit is less than a second...

[Shooter]

Heat transfer is due to temperature differential. The higher the differential, the more heat transfer. In general, higher delta T's occur when the flow is the HIGHEST!

What complicates matters is the geometry of the contact area and flow dynamics. Hot spots can be created due to flow separation at certain velocities, etc... so there is a limit to the statement above. However, it is still the "meat and potatoes" of the answer.

[ReddyWatts]

Heat transfer is due to temperature differential. The higher the differential, the more heat transfer. In general, higher delta T's occur when the flow is the HIGHEST!

Doug has it right. Maximum Flow = Maximum Cooling!

I agree, but keep the pressure and flow rate reasonable. The right setup is the best solution to over heating.

[LarrysDrifter]

I used one of those water pick ups on the UL-1 I used to have.It worked great.I can say,Ill probably use another one somewhere in the future.

[dasboata]

My 2 cents related to a car heater,, the slower the fan the hotter the air is the faster you run the fan the cooler the air gets that to me means that the higher air flow is removing more heat !!!

[keithbradley]

Hello Guys,

just want to join the discussion. First a few words about myself. I've been studying mechanical engineering for 5 years now and topically making my masters degree. Within these 5 years I also learned a lot concerning this topic due to lectures in thermo and fluid dynamics as well as heat exchange.

Therefore I can say, the more water flow, the better it is. The idea of slow water because it needs time to heat up is just a so-called hoax. So I think limitation should only be a choice when the pressure gets too high that the flexible hoses get off even if they are already secured.

And as I also run several FE quite fast FE boats for several years now I can say, the experience approved the theory. So my statement: The more - the better.

If interested I might try to explain the theory behind it with an easy explanation.

Best regards,
Manuel

I cant beleive this arguement is still going on. I have bit my tongue with every post in this thread since my last one because it seems to be one of those things that people just choose to beleive. I am amazed at how many people buy into such a silly theory. I dont understand how one can logically come to the idea that water becomes insulative at higher flow rates, or that the water "goes away" to fast even though there is constant contact between the heat source and water. I didnt mean to create such an arguement with my initial post, but I have witnessed the same myth in auto racing and felt the need to kill it before it spread.
My wife once stuck a hot french fry out the window of our car moving down the freeway at 70 mph to cool it off before feeding it to our baby. If I told you that it never cooled down because the air was simply moving to fast to remove the heat, would that make sense?
I too work in a field that allows me to test these things, but Im honestly baffled that this is any more than common sense to people.

[Shooter]

I understand your frustration, Keith. Not sure how that myth was started in the first place, but I would bet that people are thinking opposite......i.e. if we were trying to HEAT a fixed amount of water, then YES, the flow can be too fast! I think Doug alluded to that when he said "making coffee". Too funny!!

[Old Sloppy]

My wife once stuck a hot french fry out the window of our car moving down the freeway at 70 mph to cool it off before feeding it to our baby. If I told you that it never cooled down because the air was simply moving to fast to remove the heat, would that make sense?

My wife did the same thing except the french fry was frozen with dry ice, when it was held out the window it instantly burst into flames because the air was simply moving to fast to remove heat.

Seems logical enough to me...

Harry

[forescott]

Maybe I should just seal a chocolate shake inside the hull instead?

[Brushless55]

Maybe I should just seal a chocolate shake inside the hull instead?

and then get some marshmallows for the hot chocolate when your done!