I'd never seen that before. Thanks for posting the link and pictures. Have you seen anywhere what the cruising speed is of those thing? Btw they
are HUGE!
Small numbers of experimental vehicles were built in Scandinavia just before WW2. By the 1960s, the technology started to improve, in large part due to the contributions of the Russian Rostislav Alexeev and the German Alexander Lippisch. They independently worked on GEV technology arriving to very different solutions. Alexeev worked from his background as a ship designer whereas Lippisch worked from his own background as an aeronautical engineer. The influence of Alexeev and Lippisch is still noticeable in most GEV vehicles seen today.