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Hello, Today I present to you my rc Rock Crawler. This machine is almost two years in the making, and it has gone through many revisions over time. The crawler features: two buggy motors for propulsion two speed gearbox (remotely switched) independent front and rear steering linked pendular suspension The body is very similar to a trophy truck, though it is not based off any real life truck. Bodywork is not my favorite, so it took the longest! In order to go around the limits set by the pf recievers, the buggy motors are attached to switches that are then directly attached to the battery boxes. The servo motor shown is used to turn the switch, causing the truck to go forwards or backwards. I stole this clever design from efferman, so all credits got to him. The two speed gearbox takes advantage of both outputs on the buggy motors, with the low speed coming from the slower of the two motor outputs. Though it works well indoors, the high speed does not have enough power to work well outdoors. Below you can see the switching mechanism as well as the gearbox itself. The best part about the crawler is the two axles. Designing the axles was the most challenging part of the build, as I wanted to have a solid base for the rest of the model. In order to slow down the buggy motors, a lot of reduction occurs in the middle of the axle. The process was made significantly easier when I got the new portal axles from the 41999 BOSS Set. In this photo you can also see the turntables. With all the space taken up by the gears, it was difficult to fit in the steering. The linked pendular suspension was achieved by connected the two turntables via a differential. While one side goes up, the other goes down. This setup has the advantage of not needing linkages or suspension, as well as greater travel. Here is the video, with plenty of driving out in the snow! Follow me on facebook for the latest updates and photos! https://www.facebook.com/timslegos More HIGH RESOLUTION photos can be found here. http://www.brickshel...ry.cgi?f=538172 I would appreciate feedback, this is only my second studless creation . tim