The Corkscrew Tank
You don’t have to be a physics major to spot the immediate problem with this ridiculous design, but let’s get in a little bit of background information before diving into the nitty gritty. Thanks to the absolutely treacherous nature of the terrain in the northern part of Russia, sometimes engineers have to get a little creative when coming up with vehicles to traverse it. This particular design was crafted by the Soviet Union during the conflict known as the Cold War as a means to fight effectively in their own borders if the conflict escalated to that.
The corkscrew devices that were implemented on the bottom instead of tread or wheels was supposed to be used to effectively move the tank through massive snow heaps without sinking like the mass of metal it is. With the sharp and constantly digging design, it was hoped that this vehicle could move forward and sideways with little inhibition.
This was stopped, however, because of how dense the snow in the Russian mountains can actually get. More often than not, in testing sessions, the snow would get caught in the mechanisms and axels of the screws, completely halting it. The Russian Military halted funding for this project when it was unable to fix this problem and instead decided to just focus on making their existing tanks more efficient in the snow.