Endless attempts marked the beginnings of the cabin motor scooter, which was initially built neither of Messerschmitt, nor was a vehicle with cabin. The designer Fritz Fend thought to a type of bicycle with weather protection in a time without material after the Second World War. It was difficult, that one could not push it uphill. The first exemplars had still no roof over their head, but already three wheels and a transmission. But to a motor was unthinkable. Fend would have already been happy if he would have get together the raw materials for this simple machine. Helpful the fact that the war has made so many people to disabled persons. To build for those the first vehicles solved the material question, at least partially. But the production really gained momentum only then, when he contacted the world famous Professor Messerschmitt. The was not allowed furthermore to build aircrafts and had much capacity to spare. He also pointed the development in the decisive direction with the endorsement of the roof made of Plexiglas parts. However, one handicap remained, because the passengers were seated one behind the other, which was probably the death knell for the cabin motor scooter at the end. The main advantage wass the low cross-sectional area, which helped the vehicle to considerable performances even with small single cylinders. Look at the respective top speeds, even when the of the KF 175 is not suitable as a permanent speed. When driving something faster that should have even influenced the fuel consumption positively. After all, Ferdinand Piëch's dream of one-liter car has came true in such a cigar not too long ago. The driving speed was similarly moderate, only the technology more advanced considerably. By the way, the XL1 as successor, as a clearly wide vehicle, managed the undercutting of the 1 liter limit only because its battery charge was not counted. 09/14