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This topic is for discussing and provide criticism of the straddle carrier that I am working on. This is the current status: As seen in the video, there are some rather big flaws: The wheels come out of alignment and start ripping the sides away. I do not have a good solution for this yet, so please come with your input and I will try out various solutions. Using tracks would not be realistic, but it might be the most workable solution in LEGO. I really want to find a solution that has wheels mounted as the current prototype. Other areas of improvement: - Add fittings, such as the driver's cabin. - Add drivers to make it easier to align with containers - Further improve the spreader so that it can lift containers even when fairly misaligned - Increase height so containers can be stacked to 3 in height - Get the EV3 to work and be controlled using a website Functions The spreader opens and closes the hooks when lifted, so only a single motor is required to work it. If you can't see the video, then here is a sequence showing how containers can be picked up: And another sequence more close up: The other functions are driving (the four middle wheels are powered) and steering (all 8 wheels steer using the mini turntables) So there you have it. There is still a lot of work to be done on this model. Feel free to chime in with ideas - then I can try them out.