This paper introduced the energy saving principle of air intake prerotation adjustment and the application area and method of air intake prerotation regulator.
Since operating under the assumption that the outside is constantly hostile, but in the survival condo, the system could switch to an external air intake after the fallout.
The pilot would sit in front of the engine with the air intakes surrounding him and unlucky for them, as the pilot had no forward visibility because of a nose cone in front.