How to Make an RC Boat: Parts, Hull Options and Build Steps
To make an RC boat you need a watertight hull, a motor with a propeller shaft (or a jet drive), an ESC, a battery, a servo for the rudder, and a radio transmitter and receiver. The hull can be a kit, a converted static model, a simple foam or plastic-bottle build for a first try, or a scratch-built wooden hull. The tricky parts are sealing the shaft and hatch and getting the boat to float level. Here’s what to buy and how to build a boat that works the first time.
By Kyle HilsonUpdated: October 20264 min read
What do you need to make a model boat remote controlled?
| Part | Job | Beginner choice |
|---|---|---|
| Hull | Floats and carries everything | Kit hull or simple foam/plastic build |
| Motor | Drives the propeller | Brushed 380–540 motor, or a small brushless inrunner (boat motors) |
| Stuffing tube, shaft, propeller | Carries drive through the hull, watertight | Ready-made shaft set with a 2-blade prop |
| Coupling | Connects motor and shaft | Flexible coupling for misalignment |
| ESC (marine, forward/reverse) | Controls motor speed | Brushed marine ESC with BEC |
| Servo + rudder | Steering | Waterproof standard servo |
| Battery | Power | NiMH or 2S LiPo in a secure tray |
| Radio | Control | 2-channel 2.4 GHz pistol-grip set |
Wiring diagram and connections: how to wire an RC boat.
Choose a hull
| Hull | Effort | Notes |
|---|---|---|
| Plastic bottle or foam block | Low | Great first experiment; slow and not very stable |
| Converted static plastic model | Medium | Looks great; check it’s big enough for the parts and seal seams |
| Kit (wood or ABS) | Medium | Proven shape and parts list; the best route for a first proper boat |
| Scratch-built wood or fibreglass | High | Any design; see building a hull |
Larger hulls are easier: more room for parts, more stable, and less sensitive to weight. A hull of about 60–90 cm is a comfortable size for a first scratch build.
Build steps
- Plan the layout: motor low and aft, battery near the middle so you can move it to trim the boat, receiver high and dry.
- Drill the shaft hole at a shallow angle; glue the stuffing tube in with epoxy so it’s watertight.
- Mount the motor in line with the shaft using a flexible coupling; check it turns freely.
- Fit the rudder behind the propeller and link it to the servo with a pushrod.
- Grease the shaft with marine grease to seal it.
- Install electronics, receiver in a sealed box or balloon, antenna up out of the hull.
- Seal the hatch with tape or a gasket.
Test before the first run
- Bath test: float the boat with all parts installed; it should sit level with the waterline where intended. Move the battery to trim.
- Leak test: leave it floating for 10 minutes and check for water inside.
- Function test: rudder direction, motor forward/reverse, fail-safe to motor off.
- Range test at the pond’s edge before going out far.
- Have a retrieval plan (a friend with a boat, a long line or a “rescue boat”) for the first runs.
From the workbench
I’ve been in the RC hobby for about 20 years, mostly with boats, and I build many of my own boat parts; most of my racing is in the NAVIGA Mini Eco Expert class. The steps above are general advice that applies to any electric model boat.
FAQ
What do I need to make a model boat an RC boat?
A watertight shaft or jet drive, motor, ESC, battery, rudder servo and a 2-channel radio, plus a sealed place for the electronics.
Does Tamiya make RC boats in kit form?
Tamiya has sold boat kits over the years; availability varies. Many other makers offer RC boat kits in wood and ABS.
How do I make a large RC boat hull?
Plank-on-frame wood or wood covered in glass cloth and epoxy are the usual methods for big hulls.
Can I use RC car parts in a boat?
Radio and servos yes; car ESCs and motors need water cooling or a marine-rated ESC for boat use.
More on this topic: the complete RC Boats guide covers the basics behind this article.
About 20 years in RC. Mostly boats in the NAVIGA Mini Eco Expert class, with many self-made parts; also a King Motor Baja 5B, a home-built electric plane, home-built nitro planes he has flown, and an RC helicopter. More about SwellRC
