RRS-18 — 3d Printed RC Car with 2-speed gearbox

RRS-18 — 3D Printed RC Car 1:18 scale with 2-speed gearbox, front, rear and center differentials.

---

CHASSIS FEATURES:
◽ Real scale - 1/18
◽ 2 Speed Gearbox
◽ 4 Wheel Drive
◽ Smooth running drivetrain, Precise throttle control, tight turning radius
◽ Center, Front and Rear differentials with locking capability
◽ Independent front and rear suspension (IFS, IRS)
◽ Correct Ackermann angle, adjustable Camber and Toe-in
◽ Scale realism. Realistic (Scale) design, the layout of the chassis corresponds to the layout of the real car.
◽ Large suspension articulation
◽ High ground clearance
◽ Extensive customization options

Big Fun - Small Size

---

🛠️⚙️ ASSEMBLY INSTRUCTIONS
◾ Gearbox
◾ Suspension
◾ Frame

◾ ▶️ 3D Assembly Instructions

▶️ Video - RRS-18 - 3D Printed RC Car - Overview

---

You can build a crawler course track or realistic scale offroad park at home - link and get the same experience and feeling as driving a big 1/10 RC car.

With this chassis you can build a realistic radio-controlled car in 1:18 scale, which will match the modern Land Rover (Range Rover).

The chassis has smooth running drivetrain that allow you to clearly and easily control the car. The presence of a 2-speed gearbox allows you to use the chassis in different scenarios. For example, when you need smooth and controlled movement down to the millimeter and high torque (Crawler) and when you need a dynamic ride (rally like). These are the same properties that combines a real car Land Rover (Range Rover)

---

▶️ Video - Demo of Smooth running drivetrain and Precise throttle control

Using a 370 class motor with 15000 rpm with 45 mm wheels, 1st gear has a maximum speed of 2 km/h, 2nd gear has a maximum speed of 18.4 km/h. This allows for a dynamic ride (for 1/18 scale) in 2nd gear and a very smooth and controlled ride in 1st gear, which is essential for RC crawlers.

---

▶️ Video - Speed TEST. First Gear VS Second Gear

1st gear - gear ratio - 77
2nd gear - gear ratio - 8.55

All-wheel drive system of RRS-18 3d printed chassis has center differential between the front and rear axles to compensate for the different wheel speeds between the axles from different cornering radius. This prevents torsional stresses in the drive train and automatically distributes the driving forces, increasing directional stability and making your driving more effective and controllable. Center differential provides the ability to rotate the wheels of the front and rear axles at different speeds while maintaining an inextricable flow of torque.

When cornering, the right and left, as well as the front and rear wheels of the car travel a different distance and, accordingly, make a different number of revolutions and have different rotation speeds. This leads to wheel slippage, loss of grip and, accordingly, to a decrease in controllability and premature wear, and the stresses in the transmission also increase significantly, which can lead to its failure. The use of differentials allows you to solve this problem and smoothly distribute torque to all drive wheels.

---

---

NON-PRINTED PARTS LIST

---

SCREWS

M1.5x12PB (WLtoys A202-12) - 4pcs - link
M1.5x15PB (Wltoys A202-11) - 4pcs - link
Alternatively (the hole will need to be drilled out slightly to allow the arm to move freely)
M1.6X12mm - 4pcs- link
M1.6X16mm - 4pcs- link

M1.7X10mm PWA - 4pcs - link
M2x5mm - 4pcs - link
M2x5mm KB - 25pcs - link
M2x8mm - 12pcs - link
M2X8mm PWB - 2pcs - link
M3x3mm inner hexagon screw - 6pcs - link
M3x5mm - 2pcs - link

---

PARTS

Ball Head (WLtoys A949-46) - 8pcs - link
Differentials with Bearings (WLtoys K989-26) - 3pcs - link
Drive Gears (WLtoys K989-30) - link
Shock Absorber (WLtoys A202-29) - 4pcs - link

WHEELS variants:
1. 3d printed Wheels - 3d model in package (Defender 5093 style)
Tyres 48mm Off-road - link

1. 3d printed Wheels (SVR wheel for RRS RC car) - 3d model in package
   Tyres from Range Rover Sport 1:18 scale RC car - https://youtu.be/T6P2cLSHgak

2. 3d printed Wheels (SVR wheel R23) - 3d model in package
   3d printed Tyres (Michelin Pilot Sport 5) - 3d model in package

---

BEARINGS

BEARING 3x7x2 (Wltoys K989-08) - 4pcs (2 sets of bearings) - link
BEARING 3x7x3 - 4pcs - link
BEARING 6x10x3 (Included in differentials and the set above. Check the need to purchase) - 2pcs - link

BEARING 4x8x2 (Wltoys A202-23) - 8pcs - link
Alternative option - BEARING 4x8x3 - 8pcs - link

Part - (UPDATE/steering hub-v14-for-4x8x3.stl)

NAILS

Nails diameter 1.2mm - 10pc
Nails diameter 2mm - 10pc
Nails 3x80mm - 5pcs

---

ELECTRONICS

Radiolink RC6GS Transmitter - link
Radiolink R4FGM 4 Channel Mini Receiver with Gyro - link
WPL 16A Brushed ESC Speed Controller - link
JST 2.5mm connectors (2pin red conector for battery, more details in the assembly video) - link
Battery Li-Po 7.4 400mAh - link
Motor 370 class - link
Servo MG90S with skrews - 2pcs link

---

USEFUL TOOLS

Stainless Steel Digital Vernier Caliper - link
Side Cutting Nippers - link
Mini Electric Drill Power Tools - link
1.1mm-2.0mm PCB Drilling Bit Set - link
Toothpicks

---

YOU MAY ALSO LIKE

---

HERE ARE SOME RECOMMEND ITEMS ▶️

CHANGELOG
Update v4
- Added:
"steering hub-v14-for-4x8x3.stl"
"steering hub-v14-for-4x8x3-mirror.stl"
Parts for bearings 4x8x3 (Alternative option bearings 4x8x2)
Update v3
- Added: "for ANY body" - RRS-18 chassis version for Any body (Range Rover Sport suitable)
- Added: "for DEFENDER body" - RRS-18 chassis version for Land Rover Defender body
- Updated:Chassis for Land Rover Defender body
Update v2
- Added: "DEFENDER body ONLY" , 3d model suitable for Land Rover Defender body
- Added: Drive shafts version 6 "Axle-v6"
- Updated: RRS-18 - Non-Printed Parts List-v2

• For printing gears and ball ts it is better to use 0.2mm nozzle
• To strengthen the drive shafts, you can use thread and superglue wrapping