
Water cooling is an important part of radio control electric boating. It's an effective and easy way to increase the performance of your boat's electrical system. Most motors have aftermarket water cooling jackets available, which can be made from scratch or bought from several dealers. The ESC and motor require water cooling to keep the equipment cool.
| Characteristics | Values |
|---|---|
| Purpose | To keep the equipment cool and increase the performance of the boat's electrical system |
| Installation | Water cooling jackets are available for most motors, some of which are made from silicon and slide on easily |
| Input and output | For added cooling efficiency, the input water should be on the bottom and the output water on the top |
| Air in the system | Any air in the system will filter up and exit out of the output water nipple |
| Plumbing | All boat ESCs made specifically for RC boats will have the plumbing already available to hook up |
| Tubing | If your ESC has two sets of cooling paths, run a small section of tubing between them |
| Cooling coils | Cooling coils for motors are available from several dealers, or you can make them yourself |
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What You'll Learn

Water cooling jackets
To improve cooling efficiency, it is recommended to have the input water enter the jacket from the bottom and the output water exit from the top. This allows any air in the system to rise and exit through the output water nipple. For boats with two sets of cooling paths, a small section of tubing should be run between them.
When installing a water cooling jacket, it is important to ensure that the ends of the cooling coil are positioned correctly to allow for easy connection of the silicon tubing. Additional tubing may also be required between the coil and the ESC, as well as between the ESC and the hull exit.
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Cooling efficiency
Water cooling is an important part of radio control electric boating. The ESC and motor require water cooling to keep the equipment cool and to increase the performance of the boat's electrical system.
To increase cooling efficiency, it is recommended to make the input water to the jacket on the bottom and the output water on the top. This allows any air in the system to filter up and exit out of the output water nipple.
If your ESC has two sets of cooling paths, you should run a small section of tubing between them. This will help to ensure that the cooling system is functioning properly and efficiently.
When installing the motor, ensure that the ends of the cooling coil are positioned correctly to allow for easy installation of the silicon tubing. Cut pieces of fuel tubing to fit between the coil, ESC, and hull exit.
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ESCs and plumbing
Water cooling is an important part of radio control electric boating. The ESC and motor require water cooling to keep the equipment cool. Most motors have aftermarket water cooling jackets available. Silicon type slide-on jackets are easy to install, while others may require a different approach.
For added cooling efficiency, it is recommended to make the input water to the jacket on the bottom and the output water on the top. This will allow any air in the system to filter up and exit out of the output water nipple. All boat ESCs made specifically for RC boats will have the plumbing already available to hook up. If your ESC has two sets of cooling paths, be certain to run a small section of tubing between them.
To water-cool your motor and speed control, you can purchase cooling coils for motors and water pickups from several dealers. Alternatively, you can make them from scratch. First, locate where the water pickup hole needs to be drilled. You will need a 3-foot piece of 5/32" K&S aluminium tube, brass 5/32" K&S tubing, a medium silicon fuel line, and 5-minute epoxy salt.
Once you have installed the motor in the boat, ensure the ends of the cooling coil are positioned so that you can easily put the silicon tubing on. Cut a piece of fuel tubing and slide it onto the coil and pickup. Put your speed control in position and cut another piece of fuel tubing to fit between the coil and ESC. Then, cut one more piece to fit between the ESC and the hull exit. The water exit is just a small piece of 5/32" brass tube.
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Cooling coils
Water cooling is an important part of radio control electric boating. The ESC and motor require water cooling to keep the equipment cool and to increase the performance of the boat's electrical system.
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Silicon tubing
Water cooling is an important part of radio control electric boating, as it keeps the equipment cool and increases the performance of the boat's electrical system.
When installing the motor in the boat, ensure the ends of the cooling coil are positioned so that the silicon tubing can be easily put on. Cut a piece of fuel tubing and slide it onto the coil and pickup. Then, cut another piece of fuel tubing to fit between the coil and the ESC (electronic speed control). Finally, cut one more piece to fit between the ESC and the hull exit.
The water exit is just a small piece of brass tube.
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Frequently asked questions
Water cooling jackets are available for most motors, which can be made from silicon or other materials. The input water goes into the jacket on the bottom, and the output water exits from the top. This allows any air in the system to filter up and out.
Both the ESC and the motor require water cooling to keep the equipment cool and increase performance.
You can buy cooling coils and water pickups from several dealers, or you can make them yourself. You will also need tubing to connect the different parts of the system.











































