DIY RC Boat with Weedeater Motor: Step By Step Guide

DIY RC Boat with Weedeater Motor: Step By Step Guide

Building your own RC boat with a weedeater motor is an exciting and rewarding project for any RC enthusiast. Not only is it a cost-effective alternative to purchasing a pre-made model, it also allows for customization and flexibility in design. The process of building an RC boat with a weedeater motor may seem daunting at first, but with the right materials and tools, it can be a fun and relatively simple project. In this article, we will walk you through the step-by-step process of building your own RC boat with a weedeater motor, from preparing the materials to testing and adjusting the final product. Whether you’re a seasoned RC boater or a beginner looking for a new hobby, this guide will provide you with the information and tips you need to create a high-performance RC boat that is uniquely yours. So, let’s dive in and get started on this exciting project!

Preparing Materials

Before you begin building, gather the materials and tools you will need. Here are the key items required to build an RC boat with a weedeater motor:

  • An RC boat kit or plan
  • A weedeater motor with a flex shaft
  • A propeller
  • A fuel tank
  • A radio control system with a receiver, transmitter, and servos
  • A battery pack or batteries for the receiver and servos
  • Various hand tools including a screwdriver, drill, files, and pliers

Depending on the design of your RC boat, you may also need additional materials such as wood or foam for the hull. Check with the boat kit or plan instructions for specific requirements. It’s important to use high-quality materials that are appropriate for your project to help ensure a successful build. RC boat kits and weedeater motors can be found at hobby stores or online retailers such as eBay or Amazon.

Assembling the Boat

Now it’s time to assemble the boat and attach the weedeater motor. Here are the general steps to follow:

Step Description
Step 1 Install the rudder and steering servo to the boat hull.
Step 2 Attach the weedeater motor to the boat hull using a mounting bracket or separate bracket.
Step 3 Connect the motor to the propeller shaft, and attach the propeller to the shaft.
Step 4 Mount the fuel tank securely in the boat, making sure it is not too heavy or too light for the boat.
Step 5 Install the radio control system, including the receiver, transmitter, and servos. Ensure the wiring is neat and secure.
Step 6 Ensure the boat and motor are properly balanced to avoid tipping over.

Keep in mind that some boat kits may have specific instructions to follow, so always check the manual for guidance. Another tip is to use marine-grade adhesive and screws for added durability of the boat hull. Did you know that some weedeater motors can have as much as 15 horsepower? That’s enough to power some small cars!

Fuel and Maintenance

Fueling and maintenance of your weedeater motor is an important step in ensuring your RC boat runs successfully. Here are some tips to keep in mind:

  • Use a high-quality, unleaded gasoline-oil mixture for two-stroke engines with a ratio of 40:1 or 50:1. Avoid using ethanol-blended gasoline, as it can cause damage to the motor.
  • Fill the fuel tank only up to ¾ full to prevent spilling during operation.
  • Check the oil level before each use and change every 10 hours of use or as needed.
  • Keep the motor clean and free of debris to avoid overheating or malfunction.
  • Store the boat and motor in a cool, dry place to prevent rust and corrosion.

It is recommended to perform routine maintenance on your weedeater motor to prolong its life and ensure reliability. Also, consider investing in a fuel filter to prevent sediment from clogging the fuel lines. There are many online retailers where you can purchase boat kits, weedeater motors, and other RC boat accessories such as HobbyKing, Tower Hobbies, and Banggood.

Testing and Adjusting

After assembling the RC boat with a weedeater motor, it’s important to test and adjust it for optimal performance. Here are some tips to keep in mind:

  • Test the boat in calm waters, far from obstacles or other boats.
  • Start testing at half throttle to warm up the engine before going full speed.
  • Adjust the trim tabs to ensure the boat stays level in the water.
  • Experiment with different propellers to find the one that provides the best speed and maneuverability.
  • Check the motor temperature with a heat gun or infrared thermometer after a few minutes of operation. Ideally, the temperature should remain around 200°F (93°C).
  • Make small adjustments to the motor height to fine-tune the performance of the boat.

Remember to be patient and take your time when making adjustments. It may take a few tries to find the right balance for your RC boat. If you encounter any problems, consult online forums or RC hobby shops for advice. There are many online resources that offer helpful boat building tips, including and

How to make a homemade RC boat?

Making a homemade RC boat is a fun and rewarding project that can be completed in just a few steps:

  1. Gather the materials: foam board, glue, a motor, a receiver, a transmitter, and a battery.
  2. Design the boat and cut out the foam board pieces to fit your design.
  3. Glue the foam board pieces together to form the hull of the boat.
  4. Install the motor, receiver, and battery onto the boat.
  5. Connect the transmitter to the receiver and test your new RC boat in the water.

For more detailed instructions and tips, websites such as RC Boat Guide and The RCNetwork offer helpful resources for building your own homemade RC boat.


Building an RC boat with a weedeater motor can be a fun and rewarding project. By following the steps outlined in this article, you can create your own custom RC boat that’s both powerful and inexpensive. Remember to take your time, choose the right materials and tools, and test and adjust the boat for optimal performance. With a bit of patience and persistence, you can create a truly unique and impressive RC boat.

There are many websites and forums online that offer additional tips and advice for building and maintaining your RC boat. Be sure to check out sites like and for helpful resources. And if you’re looking for high-quality weedeater motors and other RC boat parts, consider checking out hobby shops like Tower Hobbies or Horizon Hobby. With the right tools and expertise, you can build an RC boat that will provide hours of fun and excitement on the water.