When the USSR for the first time tested these half planes – half ships in the Caspian Sea, the US militaries could not understand the photos they got from the satellites.
From the engineering point of view of that time such a thing were impossible.
The Americans nicknamed unfamiliar object “Caspian monster.” In Russia they called it “screen plane”.
“Screen plane” is a winged surface effect vehicle (WSEV), a combination of an aircraft and ship. It can fly on 0.5-2 meters above the sea level used the lifting effect of the water surface – screen.
The screen plane Lun tested in the Caspian Sea in 80s had 500 km/h speed.
These huge screen planes were capable of carrying enough missiles to attack an aircraft carrier grouping.