Water cooling hole

[egneg]

As long as you have water flow you will have heat transfer. But for every action there is an opposite and equal reaction. At some point you will be creating more drag than what is gained from the increased water flow (the point of diminishing returns). I say minimal water flow to achieve good running temps is all that is needed - after that you are sacrificing energy and speed.

[bonewar]

mich , i,ve drilled out all of my rudder pick ups ,with drill bit in hand and rudder, just ream the hole out very slowly , you shouldn't need to drill the vertical hole , just make sure it is clean , then enlarge all of the tubing in the boat,and exit hole. (koolstrike)I've tried water pic ups on the back of the transom,they worked fine but the amount of water they kicked up was slowing the boat down, I've tried water pick ups in the bottom of the hull , they work as well , but not as good as the pick ups on the transom, so mate in my opinion you are better off with the rudder pick up that has a nice sized hole ,larger size tubing,and very little drag. Ive put this rudder (toysports)-(pics) on both my sv27, and the maritimo its the goods . if your interested i bought it from Andrew at www.fastelectrics.com

[ggcrna]

water pickup tubing

Where can I get larger diameter tubing?
Thanks,
G

[badag98]

lowes that is where i got mine; I tried the fish tubing from Pet Smart but it was too thick and hard to bend, very stiff!

[ReddyWatts]

Quote: The myth of velocity originated among those unschooled in physics or
thermodynamics, I suppose, because a common racer "solution" is to
press a fixed restriction into the thermostat housing neck when no
thermostat is desired. The conventional (but wrong) wisdom is that
the restriction "slows the water".
In reality, all it does is provide some more dynamic pressure in the
block by restricting the flow. The exact same result could be
accomplished (assuming the water pump doesn't surge or cavitate)
with a higher static pressure (cap pressure), assuming the system
could withstand it.

http://yarchive.net/car/engine_water_restrict.html

Quote: The most common myth is: I have to slow the water down to help it cool. If this is the case; some is good more is better. Just stop the water. As silly as this sounds there people that suggest you do exactly that. Remember what you are cooling. You are not cooling the water you are cooling the engine.If the water was to move too slow or be stopped, it would take no time at all for the heat to be transferred to the water. The best coolant and the best pressurized system will still have a boiling point below 300 degrees.

The higher the water flow the better for cooling. Remember a water pump's job is to move the hot water out of the block to the radiator.

http://www.nhraunleashed.com/profile...ooling-systems

[BHChieftain]

Quote: The myth of velocity originated among those unschooled in physics or
thermodynamics, I suppose, because a common racer "solution" is to
press a fixed restriction into the thermostat housing neck when no
thermostat is desired. The conventional (but wrong) wisdom is that
the restriction "slows the water".
In reality, all it does is provide some more dynamic pressure in the
block by restricting the flow. The exact same result could be
accomplished (assuming the water pump doesn't surge or cavitate)
with a higher static pressure (cap pressure), assuming the system
could withstand it.

http://yarchive.net/car/engine_water_restrict.html

Quote: The most common myth is: I have to slow the water down to help it cool. If this is the case; some is good more is better. Just stop the water. As silly as this sounds there people that suggest you do exactly that. Remember what you are cooling. You are not cooling the water you are cooling the engine.If the water was to move too slow or be stopped, it would take no time at all for the heat to be transferred to the water. The best coolant and the best pressurized system will still have a boiling point below 300 degrees.

The higher the water flow the better for cooling. Remember a water pump's job is to move the hot water out of the block to the radiator.

http://www.nhraunleashed.com/profile...ooling-systems

-Chief

[m4a1usr]

Where can I get larger diameter tubing?
Thanks,
G

I found the Silicone tubing at Petsmart for fish tanks a pretty good deal. The id is .160 and the od is about the same as nitro fuel tubing that is only .125 id. Cheap too. Less then 3 bux for 8 ft. Its not pure silicone tubing though. Its a mix but still has a higher temp rating then the polyethelene found else where.

John

[ncornacchi]

I messed with transom pickups, thru-hulls, boring rudders and finally convinced a friend to make these up. They are the exact replacement fit to the UL-1, but could be made to fit anything...I obviously feed the motor and ESC spearately now. If only I could get the battery temps down now...Motor (1515Y)=temp A, ESC (cc240)=tempB, Batts=temp C

[ncornacchi]

Couldn't upload second pic...happens alot...pic size too large?