Introduction: RC FPV-Trike With Rear Steering Wheel

About: Like to make stuff

As I had some spare parts from my first FPV Rover, I've decided to build a RC car. But it shouldn't be just a standard RC car. Therefore I've designed a trike with a rear steering wheel.

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Step 1: Parts to Print

Find all parts you need on Thingiverse

I've printed all parts (beside the tires) in PETG. But any material is fine here. Tires are printed in TPU.

1x Body

1x Top part 1

1x Top part 2

1x Front fender left

1x Front fender right

1x Rear fender

1x Servo arm

2x Servo extension

1x Rear wheel attachment (Support needed)

1x Rear wheel

1x Rear tire (use TPU)

2x Front wheel

2x Front tire (use TPU)

Step 2: Parts You Need (BOM)

Here is the list with all necessary parts for the rover

2x Motors

2x ESC

1x Servo

1x 3S Battery

1x Transmitter/Receiver

16x 6mm x 3mm magnets

2x JST plugs

4x M2 Metal Ball Head Holder

2x 12mm x 8mm x 3,5mm bearings

2x 10mm x 5mm x 4mm bearings

2x M2 x 4mm screws

2x M2 x 8mm screws

12x M2 x 10mm screws

2x M2 x 12mm screws

2x M2 x 25mm screws

4x M3 nuts

4x M3 x 25mm button head screws

2x M3 x 14mm button head screws

1x AIO Mini FPV Cam

To Power the AIO FPV Cam use a 1s battery or a step down converter

1x Rubber band (to secure the camera)

CA glue, hot glue gun, screw driver, some cable, soldering station

Step 3: Preparing Motors

The ESCs have a switch which you can keep if you want. If not, unsolder the two cables and bypass the two pins. So the ESC is always "on".

Solder the JST plug to the motor. You can solder the ESC directly to the motor, but it's easier to replace with the plug if something broken.

Add 4 M3 nuts to the body and attach the motors with 4x M3 x 25mm button head screws

Step 4: Add Magnets to Body and Top

You need 16 magnets 6mm x 3mm for the body and the top.

Use CA glue to keep them in place.

Step 5: Rear Wheel Attachment

The rear wheel has build-in-support on one side where a bearing belongs to. Cut this with an exactor knife and open the hole

Step 6: Prepare Servo and Servo Arm

Cut the edges from the original servo arm to fit into the enlarged servo arm.

Step 7: Attach Rear Wheel to Body

Step 8: Front Wheels and Electronics

Attach the front wheels to the motors. They should press-fit to the motor shaft.

To secure the ESC to the body use hot glue, velcro or double sided tape.

Step 9: FPV-Camera and GoPro Mount (optional)

If you use a FPV-Camera, I do recommend to use one of the protectors. I use the one where I can attach the GoPro to it.

To secure the FPV-Camera, you'll need one rubber band.

In my case, the camera is powered by an own battery. It is a small 1s from an Eachine E010. For this, the top has a compartment where you can place the battery.

If you want to power the FPV-Camera from the trikes battery, you'll need a step-down-converter, as the trike uses 3s.