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3. Components for RC car

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Steps

18

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Attention!

  • If you build an RC Cybertruck, you need every part which listed on the Model Cybertruck page and additional the parts, which are listed here below.

Step 1: General information

You can find here the specifications for each part with some explanation. If you are new in the RC world, we have a strong recommendation for each component.

Other, similar parts also could work, specially if they fulfill our specifications.

Attention!

  • If you choose a more powerful components, check all critical components (battery, speed controller, motor) compatibility to each other and prepare yourself for a possible overheat problems at summer time, or on long-time heavy usage!
  • If you already have some other RC components around you and you are Pro in the RC world, you should check the Maximum physical dimension specifications, because every RC component has a dedicated space.

Step 2: Battery

It is one of the most important component for any electric vehicle (EV) car. We tested our powertrain with the next battery specification:

Specification:

  • Type: LiPo (Litium polymer battery) recommended
  • Maximum physical dimensions: 47 mm x 138 mm x 25 mm (1,85 in x 5,43 in x 0,98 in)
  • Connector type: T-dean Plug (it is connected to your Electronic Speed Controller (ESC) )
  • Charging Balancer Connector type: JST-XH (it is connected to your charger)
  • Recommended Cell Configuration / Voltage: 2S / 7,4 V (2S = 2 Cells in Series)
  • Optional Cell Configuration / Voltage: 3S / 11,1 V (3S = 3 Cells in Series)
  • Discharge rating: 50 C ( C = capacity) (more Discharge = better acceleration)
  • Capacity: 5200 mAh (more capacity = more time to play)

Information / Math lesson:

Let’s calculate our max. discharge:

  • Our Discharge rating: 50 C (C =capacity)
  • Our Capacity: 5200 mAh

So the max. discharge: 50 x 5200 mAh = 50 x 5,2 Ah = 260 Ampere.

So your battery can produce 260 Ampere and your Electronic Speed Controller (ESC) has to handle this amount of peak Amperes.

Our proposal:

Information

  • We made some test with 3S battery too, which give better acceleration, but it is also make more stress on the powertrain parts and shorten the drivetrain lifetime.

Step 3: Electronic Speed controller (ESC)

Information:

  • This component will communicate with your transmitter, control your motor speed and send the power from the battery to motor.

Specification:

  • Maximum physical dimensions: 32 mm x 36,5 mm x 18 mm
  • Connector type: T-dean Plug (it is connected to Battery T-dean)
  • Voltage range: Should support 2S and 3S Lipo battery
  • Forward Peak Current: Should be more than our calculated battery peak discharge rate. So in our case it should be more than 260 A.
  • Motor type: Brushed motor support need (550 Size)
  • Motor limit with 2S battery: More or equal than 12T
  • Motor limit with 3S battery: More or equal than 18T
  • Quantity: 1 piece for Rear Wheel Drive (RWD) and 2 pieces for All Wheel Drive (AWD)

Information:

On the RC motor world the 550 Size category define the motor size. The 12T, 21T, 29T, 35T the “T“ mean the number of the turns. This is the number of times the wire inside the motor is wrapped around the stator.

Practically with the 12T motor you will get high speed/low torque, with 35T low speed/high torque.

Our proposal:

Information:

With our recommended ESC you have chance to upgrade your battery from 2S to 3S, if you would like to build a higher performance RC.

Step 4: Motor

Information:

On the RC motor world the 550 Size category define the motor size. The 12T, 21T, 29T, 35T the “T“ mean the number of the turns. This is the number of times the wire inside the motor is wrapped around the stator.

Practically with the 12T motor you will get high speed/too low torque, with 35T low speed/high torque.

Our proposal is the 21T, alternative: 29T.

Specification:

  • Motor type: Brushed Motor
  • Size category: 550
    • House diameter: 36 mm (1,41 in)House length: Max. 55 mm (2,17 in)Shaft diameter: 3,175 mm (0,125 in)
    • Shaft length: 11 mm (0,43 in)
  • Our proposal for turns: 21T
  • Alternative for turns: 29T
  • Supported Voltage: 7,4 V…11,1V
  • Quantity: 1 piece for Rear Wheel Drive (RWD) and 2 pieces for All Wheel Drive (AWD).

Our proposal:

Alternative:

Step 5: Motor extensions

Attention!

During a long time, heavy usage your motor will be hot! If your motor temperature will be too high, the first 3D Printed PLA gear on the motor will melt and the RC car will stop working.  In this chapters you have some possibilities to fight with the motor heat with some supplier part. You can choose how far you go!

About the 3D Printed related heat management you will be found information in the next chapter.

  • Use an Aluminum heat shield on the motor to help  in heat distribution (must have!)
  • Use active cooling with 30 mm x 30 mm x 10 mm fan on the dedicated place (recommended),
  • Use on the motor shaft a metal extension part, which have a bigger flat surface like on the motor 3,17 mm diamater (only for performance edition)

Our proposal:

Only for performance editions:

Step 6: Servo

For the first wheel steering we need a servo.

Specification:

  • Min. torqu : 20 kg
  • Control Angle: 270°
  • Output gear shape: 25T
  • Connector type / length: JR-3 pin / 320 mm ± 5 mm
  • Size: 40 mm x 20 mm x 40,4 mm
  • Quantity: 1 piece

Our proposal:

Step 7: Round Servo Horn

According our tests here we need to use metal interface to make a reliable connection between the Servo 25T shape and the plastic gear.

Specification:

  • Material: Aluminum
  • Output gear shape: 25T (Has to compatible with the servo!)
  • Servo disc outer diameter: 20 mm (Maximum!)
  • Bolt Circle diamter (BCD): 14 mm
  • Screw: 4 pieces, M3x6
  • Thickness: 4 mm
  • Quantity: 1 piece

Our proposal:

Step 8: Transmitter / Reciever

The transmitter’s channel number is one the most important specification point. The next features use 1-1 channel.

  • Channel #1: Steering – Servo drive (must have)
  • Channel #2: Rear / Rear and Front motor drive (must have)
  • Channel #3: Motor fan (recommended)
  • Channel #4: Back LED headlight (optional)
  • Channel #5: Front LED lights (license plate & tail light) (optional)

For the complete Cybertruck experience 5 channel need, but for basic functions two-three channel enough.

Specification:

  • Channels:
    • Proposal: minimum 5 channel
    • Minimum, with reduced functions: 2 channel
  • Max. receiver size: 30 mm x 22 mm x 16 mm

Our proposal:

Alternative (but not recommended):

Step 9: Shock absorber

We need a 4 pieces shock absorber. Here are the specifications.

Shock absorber Specification:

  • Hole to Hole length (uncompressed): 80 mm
  • Length after compression: 65 mm
  • Shock body diameter: 15 mm
  • Rod End Aperture: 3 mm
  • Quantity: 4 pieces

The Cybertruck RC will be heavy, so we need a 4 stronger springs. It is optional, because you have a chance to use the shock absorber original springs with a 3D printed washers, which will increase the springs preload, so it also would work.

Extra Spring Specification:

  • Spring length: 60 mm
  • Outer diameter: 15 mm
  • Wire diameter: 1,5 mm
  • Quantity: 4 pieces

Our proposal:

Alternative:

Step 10: Driveshaft Dogbone

The drive from the motor to the wheel go with this part. We made lot of test, but because of the lot of power and the limited available space it has to be a metal part.

Specification:

  • Spare part for HSP RC car. Spare part artikle number: 02003
  • End-to-end distance: 61 mm
  • Pin Center to Pin-center distance: 55 mm
  • Pin diameter/length: 2 mm / 10 mm
  • End balls diameters: ca. 6 mm
  • Driveshaft diameter: ca 3,5 mm
  • Color: Any
  • Quantity: 2 piece for Rear Wheel Drive (RWD) and 4 pieces for All Wheel Drive (AWD).

Our proposal:

Step 11: Diff Drive Cup

The driveshaft dogbone 2 mm diameter pin would destroy the 3D printed plastic pars, so we need to use a metal insert in the 3D printed PLA part. Here are the insert specifications:

Specification:

  • Spare part for VRX RC car. Spare part article number: 10132
  • Fit for 6 mm end balls
  • Quantity: 4 piece for Rear Wheel Drive (RWD) and 8 pieces for All Wheel Drive (AWD).

Our proposal:

Step 12: Front light (optional)

You can use front headlight on your Cybertruck, if you build an RC Cybertruck.

Specification:

  • Type: TRX-4 TRX-6 D90 HSP Redcat RC 4WD Tamiya Axial SCX10 HPI DIY 1/10 RC Car Crawler Truck LED Light bar
  • Length: ca. 154.. 156 mm (dependent the webshop how accurate)
  • Height: 11 mm
  • Thickness: 13 mm
  • Wire length: min 350 mm
  • Number of the LEDs: 24 pieces

Our proposal:

Warning / History!

  • From 19.08.2024 the previously used 147 mm LED Lightbar was has been removed from the INJORA product range, therefore now we used the 154…156 mm long LED Lightbar
  • If you bought the longer LED Lightbar, than please make sure that you download our Cybertruck 1.2 update, because we had to modify some of our 3D printed parts around the LED Lightbar!
  • in some webshop you can found 154 mm netto LED Light length, on some other webshop they include the metal side frame, so it could be 155 mm, or even 156 mm on the webshop description.

Step 13: Back Lights (optional)

You can use a tail light and license plate light.

Specification:

  • 4 pieces LED package
  • Red Light Diameter: 3 mm (2x)
  • White Light Diameter: 5 mm (2x)
  • JR connector
  • Specification code: 3 mm 2R 5 mm 2W

Our proposal:

Step 14: Grease

Information:

For the drivetrain gears need some grease to help in a wear resistance and heat distribution. You can use any kind of grease. The easiest way if you use your 3D printer lubricate. The 3D printed gears are thouher like you think, so not need to buy an expensive “dedicated” RC grease.

Specification:

  • Type: Any kind of grease, for example some Silicone basesd lubricant
  • Recommended quantity:  ca. 10 gram (0,35 oz)

Our proposal:

  • Use your existing 3D printer grease

Alternative:

Step 15: Thread locker

There are some screw which need a thread locker to avoid that it is loose, because of the vibration or mechanical load.

Specification:

  • Manufacturer / type: Loctite 243
  • Strength: Medium strength, so it can be opened, if you want to remove the screw later on!
  • Color: blue liquid
  • Recommended quantity: ca. 5 ml, or 10 ml

Our proposal:

  • Check the Loctite 243, or similar medium strength thread locker in your local hardware store

Alternative:

Step 16: Bearing

The drivetrain and the wheel hubs need some ball bearings. In the next table you can found the bearing type, sizes and the necessary qunatities for Rear Wheel Drive (RWD) and for All Wheel Drive (AWD).

# Bearing Size categorySizeQuantityWhere used?
You can choose a bearing sealing.
The options:
–  ZZ, or 2Z = steel sealing
– RS, or 2RS = Rubber sealing

Any kind of sealing is ok.		ID = Inner diameter
OD = Outer diameter
w = Width
For Rear Wheel Drive (RWD)For All Wheel Drive (AWD)
161700, or 6700ID = 10 mm
OD = 15 mm
w = 4 mm		3
pieces		6 piecesIn the
drivetrain gears
261702, or 6702ID = 15 mm
OD = 21 mm
w = 4 mm		12 pieces16 piecesIn the wheel
hubs;
in drivetrain differential

Our proposal:

Step 17: Cable converters, extension cables

For All Wheel Drive (AWD) need:

  • T-dean Y Cable: from one Male to two Female plug (1x)

    It is used to split the power from one battery to two ESC (Electronic Speed Controller), See it in Chapter 25 / Step 4

For All Wheel Drive (AWD) need:

  • JR Extension Y Wire Cable: from one male to two female – 15 cm (2x)

    1: It is used to connect two ESC into the Transmitter #2 Slot, See it in Chapter 25 / Step 10
    2: It is used to connect two fan into the transmitter #3 Slot, See it in Chapter 25 / Step 12

For All Wheel Drive (AWD) and for Rear Wheel Drive (RWD) need:

  • JR Extension Wire Cable – 15 cm(1x)

    It is used to connect the back LED into the Transmitter #4 Slot, See it in Chapter 25 / Step 13




Our proposal:

Step 18: Battery charger, charging tips

Attention! Danger!

  • Rechargeable Lithium-ion polymer batteries are potentially hazardous and can present a serious
    FIRE HAZARD, SERIOUS INJURY and/or PROPERTY DAMAGE if damaged, defective or improperly used.
  • Never charge batteries unattended, or where objects such as carpet, furniture, wood or vinyl floors, curtains or other flammable objects are present.

To use the Cybertruck RC battery we need to charge it too. You should have choose a proper battery chager. The necessary specification:

Specification:

  • LiPo battery support
  • 2S-3S battery support (at least)
  • T-dean plug support
  • JST- XH Balancing plug support
  • Socket plug: according your local demand ( US plug, EU plug, UK plug, or AU plug)

Our proposal:

Information:

When your battery charging/discharging your voltage level also increasing/decreasing. In the next table you can found the connection between capacity and voltage level for 1S, 2S and 3S LiPo battery.

Try to keep the battery capacity between 20% and 90% for the longer battery life! If the car go slower than usually, the battery should be check and charge it, if it is necessary.

Battery type1S
(1 Cells in Series)		2S
(2 Cells in Series)		3S
(3 Cells in Series)		4S
(4 Cells in Series)		5S
(5 Cells in Series)		6S
(6 Cells in Series)
Nominal voltage3,7 V7,4 V11,1 V14,8 V18,5 V22,2 V
Fully charged Voltage4,2 V8,4 V12,6 V16,8 V 21 V25,2 V
Supported for Cybertruck RC?Not supported (Not tested)Recommended (Tested)Optional
(Tested)		Not supported
(Not tested)		Not supported (Not tested)Not supported (Not tested)
Capacity [%]Voltage [V]Voltage [V]Voltage [V]Voltage [V]Voltage [V]Voltage [V]
1004,28,412,6016,8021,0025,20
904,118,2212,3316,4520,5624,67
804,028,0512,0716,0920,1124,14
703,957,9111,8615,8119,7723,72
603,877,7511,6215,5019,3723,25
503,847,6711,5115,3419,1823,01
403,807,5911,3915,1818,9822,77
303,777,5311,3015,0618,8322,60
203,737,4511,1814,9118,6322,36
103,697,3711,0614,7518,4422,12
03,276,559,8213,0916,3719,64

6 responses to “3. Components for RC car”

  1. Is there an alternative for the front light? Both links for the NJORA 15x153mm 22 LED Roof Light Bar are not found, and I can’t find one listed anywhere.

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