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ChainRider . A trike with remote control and huge wheels from chain elements . The ChainRider is a trike featuring two huge wheels, remote control, and, i dare say, excellent drive properties. It is made entirely from a single LEGO set 8275, but appears to be much more fun in playing than the bulldozer! Credits go to my son who observed that the chains could be used to form stiff rings when turned inside-out. Subsequently i made two huge wheels from the chains. Using the small Power Functions motors for their higher rotating speed, and directly mounting them on the wheels, a theoretical maximum speed of about 11 km/hr is achieved. It took a couple of attempts to fiddle the battery box and hence the center of the mass, which heavily affects the driving behavior in turns, and also determines how easy wheelies, flips and stand-ups can be performed. See the YouTube movie: ChainRider. In case of a crash the battery box would come off in an earlier version, which prevents breaking some parts i thought, but fixing it got so annoying (yes, lots of crashes :) that in the current design the front wheel usually comes off, which is easier to fix. The engine is just added for the looks, like the seat and the wheel caps. I observed that the front wheel gets battered over time by all the hits in landing after a wheelie or flip. I took pictures when i took it apart, so you can rebuild it yourself! There are 138 pictures in a photobucket album called ChainRider for that: Please use the slideshow in reverse. Use the pause/play button to proceed and build along! Make sure you start at a picture showing two small power function motors. This is the most playable model i made so far, i think. The kids can drive it for hours. For more grip I wrap rubber bands around the chain wheels. It also depends on the ground material and if you want to drift and slip or if you want to do wheelies and flips. UPDATE: see also my "ChainRider XL"! Happy driving! NXTLiftBoy

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