Screw-drive RC tanks… this isn't new, but it's interesting to see it come back So I came across a screw-drive RC tank recently and it got me thinking… this idea actually isn't new at all. If you go back a bit, like Cold War era, there were already experiments with screw-propelled vehicles. One of the more well-known ones was the Soviet ZIL-2906. That thing was designed to move through really difficult terrain, snow, swamps, places where normal wheels or even tracks struggle. It looked weird, but it had a purpose. The basic idea hasn't really changed. Instead of wheels, you use these large rotating screws, almost like augers, to push the vehicle forward. Not efficient on normal ground, but in soft terrain it actually works better than expected. Fast forward to now and people are building smaller versions again, like RC tanks using the same concept. I saw one recently that used 3D printed screw drums, mirrored so they rotate in opposite directions.…