My T-55A tank was actually not my first tank that I built- that credit goes to the amx 13-75, which served as a testbed for my experiments.

Where did you think I got the idea to use lego worm gears? It was after I experimented with a bunch of other complicated designs, such as a Lego double differential gearbox, that I thought to go simple.

What about the suspension? The original suspension on the amx was awful- I used external compression springs, which did not work well because the springs were not fixed properly. I later had the idea to use internal tension springs, which had much more suspension range and stability. I did use external compression springs in my RU-251, but they were designed properly after my initial disaster with the amx.

I don't actually remember when I started building this tank, but it was probably right after I finished my Leopard 2A4, and it was supposed to be a VK 16.02 Leopard tank. This one was even smaller than the RU-251, and I was only able to complete one half of the hull before abandoning the project. This mini-project did teach me a lesson though; there is a limit to how small certain things can get, and I reached that limit for DIY RC tanks. As with the RU-251, I was having a bunch of tolerance issues, which were more pronounced given the even smaller size, and I was not able to fit a small enough gearbox and motor inside the tank.

I will probably revisit the VK tank, as I really like the design, and I will definitely take what I learned and make the tank big enough to fit everything.