How to Build an RC Car Frame: Materials, Layout and Steps
To build an RC car frame, choose a layout (flat plate, tub or ladder frame), pick a material you can work with (plywood or 3D-printed plastic for a first build, aluminium or carbon fibre for strength), and design it around the parts: axles or suspension, motor and gearbox, battery, ESC, receiver and steering servo. Keep the battery low and central, leave room for wiring, and build in mounting holes for standard RC parts. Here’s how to plan and build it step by step.
By Kyle HilsonUpdated: October 20264 min read
Which frame layout should I build?
| Layout | Description | Best for |
|---|---|---|
| Flat plate | One flat chassis plate, parts screwed on top; optional top deck | On-road cars, first DIY builds |
| Tub | Moulded or folded tray with raised sides | Bashers and short course trucks (protects electronics) |
| Ladder frame | Two side rails with cross members, solid axles below | Scale crawlers and trucks |
| Space frame / tube | Welded or bonded tubes | Scale buggies, show builds |
Which material?
| Material | Pros | Cons | Tools |
|---|---|---|---|
| Plywood (3–6 mm) | Cheap, easy to cut and drill | Not waterproof; splits under hard impacts | Jigsaw, drill |
| 3D-printed PETG/ABS/nylon | Complex shapes, mounts printed in | Weak along layer lines; design thick sections | 3D printer |
| Aluminium plate (2–3 mm) | Strong, stiff, durable | Heavier; needs metalworking | Hacksaw, files, drill |
| Carbon fibre plate | Very stiff and light | Expensive; dust is hazardous when cutting | Diamond/carbide tools, mask |
| LEGO Technic | No tools, rebuildable | Flexes; needs LEGO-compatible motors or adapters | None |
Plan the layout around the parts
- Collect the parts first: wheels, axles or suspension, motor and gearbox, battery, ESC, receiver, servo. Measure each one.
- Set the wheelbase and track (distance between axles and between wheels). A longer wheelbase is more stable; a shorter one turns tighter.
- Place the battery low and near the centre for balance; make it easy to swap.
- Put the motor close to the driven axle with a gear mesh you can adjust.
- Mount the steering servo near the front axle with a short, straight linkage (see how RC steering works).
- Leave space for wiring, the receiver antenna and cooling air for ESC and motor.
- Draw it full size on paper or in CAD and test-fit parts on the drawing.
Build steps
- Transfer the drawing to the material and cut the main plate.
- Drill mounting holes; use metal inserts or threaded inserts in plastic and wood.
- Add stiffeners: a top deck, side rails or folded edges reduce flex.
- Mount axles or suspension arms (suspension guide).
- Install motor, gears and drive, then steering.
- Fit electronics with double-sided tape, cable ties and short wires.
- Bind the radio, set the fail-safe, test on a stand before the first run.
Shortcut: start from existing parts
- Use an old RC car’s axles, gearbox and suspension on your own frame.
- Printable chassis designs (for example open-source 3D-printed RC cars) give you a proven base to modify.
- Rolling chassis kits let you design only the body and electronics layout.
Making the electronics yourself: RC car circuit board.
FAQ
How do I build a homemade RC car from scratch?
Plan the layout around your parts, build a frame from plywood, printed plastic or aluminium, add axles or suspension, motor drive, steering servo and RC electronics, then test on a stand.
What is the best material for an RC car frame?
Aluminium or carbon for strength; plywood or 3D print for a first, cheap build.
Can I build a fast RC car myself?
Yes, with a brushless motor and ESC, but the frame, drivetrain and tyres must handle the power. Start with proven parts.
How do I build a LEGO RC car?
LEGO Technic frames with LEGO Powered Up or compatible motors and a hub work well for slow cars; for speed, use hobby electronics with adapters.
More on this topic: the complete RC Cars 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
