I saw some kids playing with RC toys and decided that I would build a RC toy for myself. A tank was perfect, its treads would mean it's more or less an all-terrain vehicle.
It is entirely based on Power Function components. 4 M-Motors power the treads, 2 on each side. A 2:1 gear reduction provides more torque. A battery pack mounted at the top for easy access provides power. The IR receiver is mounted behind the battery pack.
The frame is constructed using studless construction. It's a very simple design, but very rigid and stable. The treads have limited suspension, allowing the tank to transverse over obstacles without getting stuck. The CG is shifted behind by placing the battery pack at the back, to counter any weight that might be placed in front.It is true that torque can be improved by exchanging the 4 M-Motors for 2 XL-Motors, but I don't have 2 of them, so I had to stick with this. At full battery, the torque produced is already more than enough, more than what the treads can handle.
One of the design flaws is that the exposed gears may get jammed with foreign objects. I solved this by attaching a cover built much later than this tank to shield the gears. In the video the cover is not shown as at that time, the cover is not built yet.
This tank is very good, considering that I spent just two days designing and building it. I plan to add attachments to make it more useful next time.
Here's the video:
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