NickD said:
Look into the research done by the US regarding planes with no landing gear. Just a greased rubber strip to sort of Slip-N-Slide on. One report had rubber marks on the TOP of the leading edge of the wings. Most landings resulted in excessive damage to test pilots, like severe spinal compression, in one instance the pilot's front teeth were embedded in the stick...
Further testing did involve a rudimentary HANS system, and then they discovered that locking the pilot's head to the airframe made flying difficult because of how disorienting it was, like the plane was stationary and the world was rotating around.
I am not entirely sure what the goal was of having a plane that required a special landing strip and could not taxi. I'm inclined to believe that it was intended for Soviet spies to find and cause Mikoyan-Gurevich to waste all sorts of funds to research.
Meanwhile, Ukraine is asking for SAAB Gripens because they can use any piece of road to land on and take off from, and can be serviced remotely with a small crew and two trucks.