4WD RC Buggy




Greyhound - 4WD RC Buggy with BuWizz 2

First of all, a big thank you to everybody who supported me in the corresponding WIP-topic on Eurobricks!

Apart from pursuing performance, this model explores what's possible when it comes to robustness and durability. This has much to do with the fact that this is a 4WD model with 2 BuWizzes. A lot of power is sent to both the front and the rear wheels. That puts high demands on the strength of all kind of things; the steering, the suspension, the chassis, the bodywork. I had to think outside the beaten track on all these aspects, while holding on to requirements such as Ackermann geometry, small turning radius, extensive suspension travel and minimal slack in moving parts. But adding strength and coherence comes at the price of using more parts, which adds weight, which requires even more strength, etc. With this model I have tried to find a balance between performance, robustness and weight. A balance that fits the power of 2 BuWizzes and 4L motors on the one hand and a 4WD model built from LEGO on the other hand.

2018/11/18 - I made a small correction to the order of images.
2018/11/19 - I corrected the image showing the WD40 spray. It now shows PTFE spray, as mentioned in the text.
2018/12/08 - During rough rides the first and only link that can disconnect are the pins with towball that connect the gearrack assembly to the steering links. If you want to take this model to the limit, it's advisable to use set-screws to secure the pins. Drive the screws all the way in. They should surpass the outer ridges of the pin:

-If you want the BuWizzes to be removable more easily, remove the red pins holding them, after page 558.
-The wheels (rims with tires) need to be squeezed against the turn-tables tightly. Press the yellow 3L lever while holding the back side of the turn-table. The rubber connectors will secure the wheel to the 5.5L axles. The 5.5L axles should stick out the yellow 3L levers a little. Here's a video showing how to make the wheels and how to attach them to the wheel hubs.
-To avoid wear and improve performance, it is advisable to lubricate the springs and the turn-tables. Use PTFE spray from WD40 (so NOT the normal WD40 spray). The impact modifier in ABS dissolves in the silicon carrier in silicon spray. WD40 PTFE spray does not have this issue.
-Try to keep your turn-tables clean.
-2 BuWizzes are not included in the inventory.
-Turn-table-based wheel-hubs with minimal slack
-4WD by means of 4 L-motors powered by two BuWizz 2 units
-Fully independent suspension
-Steering with Servo-motor
-30 degree steering angle with Ackermann geometry
-Caster angle
-Fake V8-engine driven by M-motor
-Can handle a rough ride
-Liftable by roof, nose and tail
-Everything in-system
Notes on parts
- 99773 (Technic Beam Triangle Thin [Type II]) used inside the front suspension module should not be confused with 2905 (Technic Beam Triangle Thin [Type I]).
- 95292c01 (Technic Shock Absorber 9.5L with Extra Hard Springs) are quite expensive. You might consider assembling them yourself from the cheaper 2909c03 (Technic Shock Absorber 9.5L with Soft Springs) and non-LEGO springs. On doctor-brick.de the following springs have been suggested:

Some indoor playing...

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Name 4WD RC Buggy
Designer Didumos
Designed 2018
Parts 1934
Theme Technic
New Sets from The Lego Movie 2
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PDF - Photo Sequence

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This MOC also has a 3D digital file available (eg LDD, MPD, etc): 3D Model

Submitted by shijialin88 Jan. 12, 2019
Submitted by shijialin88 Jan. 12, 2019
Submitted by Jorre79 PRO Jan. 11, 2019
Submitted by Jorre79 PRO Jan. 11, 2019
Submitted by Jorre79 PRO Dec. 16, 2018
Submitted by Jorre79 PRO Dec. 16, 2018
Submitted by Jorre79 PRO Dec. 16, 2018
Submitted by Jorre79 PRO Dec. 16, 2018