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Water cooling...

Old 10-26-2004, 11:21 AM
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Dizzy Dingo
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Default Water cooling...

Hey silly question, but.

It's it feasable to run a water cooling system with out a pump. AKA a scoop on the hull that uses the boats velocity to push water through the system?

Cheers

DD
Old 10-26-2004, 11:32 AM
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Ron Olson
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Default RE: Water cooling...

That's how we do it.
Old 10-26-2004, 11:33 AM
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Default RE: Water cooling...

Yes

On most speed boats, there will be a tube with a 45 degree cut facing forward hanging just below the transom, or hanging behind the propeller. That is enough pickup to run the cooling.
Old 10-26-2004, 12:21 PM
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Mr Cajun Gator
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Default RE: Water cooling...

Can also install a rudder that has a water pick-up built into it.
Old 10-27-2004, 10:19 AM
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Dizzy Dingo
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Default RE: Water cooling...

Sweet deal, thanks for the info!

I am building a boat from scratch over the winter. I have a nice 32CC line trimmer engine I am in the middle of customizing and fitting out for marine use. Rather than run a waterpump I was hoping a inlet system would fly.

Thanks

DD
Old 10-27-2004, 10:27 AM
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Ron Olson
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Default RE: Water cooling...

There are 4 basic ways to install a water pickup. The one in the rudder, a pickup behind a prop, through the bottom of the hull and one mounted in a trim tab. You are better off with one of these setups, preferably the one in the rudder as this one has a more constant supply. Vacuum powered water pumps only can pump only so much water so at high speed you might not get enough flow.
Old 10-27-2004, 11:59 AM
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Dizzy Dingo
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Default RE: Water cooling...

This leads to another option. Out drive VS struts. Not really caring for surface effects, I was going to throw the stuffing box and prop out the bottom "HOME BREW INBOARD" style and use cavity plates to trim the boat. The rudders(S) were going to be a separate entity. I was going to make them using some good aluminum stock and adding the pickup might require a little more manufacturing than I have the tools for.

So anybody know of a good out drive set that has a rudder with a water pickup and can be set for submersed over surface prop configs.

Once again, new to the R/C boating world so if my terms are off and I have no clue. Please tell me!

Cheers

DD
Old 10-27-2004, 07:13 PM
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MikDee
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Default RE: Water cooling...

Just use a short piece of maybe 3/16" OD brass tubing, and grind a 45degree bevel on one end, then hang it off the transom, or mount it thru the hull, then attach a piece of fuel tubing to the other end.

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