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4x4 T815

Monday 23 August 2010, by Nico71

See it online

Technical data

Scale (wheels used)
Width 25 studs
Total Weight 900 grams
Transmission 4x4
Motorization 1 motor(s) - PFS XL

working fake motor
Steering motor

without steering wheel
Onboard Battery Box PFS

My first Trial Truck with 94mm wheels. Features drive, steering, fake engine and independent suspensions with swinging half-axles. Including building instructions.

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The aim of this truck was to participated at the contest organized by Freelug at Fana’briques 2010. The main impositions were : powerful, high ground clearance, small turning radius and full independent suspensions. In order to complete the challenge, I have ordered 2 94mm-diameter wheels,then the building process could start. The axle are the most resistant tatra’s axles I have made, because I used this parts to create the bevel gears, reinforced by transverse liftarms to lock the structure. The 94mm-diameter wheels enable to use portal axles with high ground clearance. The final reduction is 12/20, 8/24, 8/24 so 1/15.

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In order to have the maximum of stability on slope, I have chosen during the building process that the Battery Box will be in the frame, in the front for 66/33 wheight distribution. As far as I know, the 66/33 weight distribution is very good for clearing abilities with real off-roader vehicles. To avoid a complex drive-train to give power on the fake engine, I used a simple drive-shaft as real, built with 2 U-joins. Considering the small place I had near the XL motor, I have chosen to build the U-join with a Ribbed Hose as suggested on the official lego patent.

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You can find the building instructions here :

View online : Article on my blog

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