METHOD OF FLIGHT OF MULTISTAGE AIRCRAFT Russian patent published in 2009 - IPC B64G1/14 

FIELD: transport.

SUBSTANCE: method of flight of multistage aircraft (AC) with liquid-propellant engine (LPE) including at least one air stage - airplane with at least one air-jet engine (AJE) consists in that during flight preliminary stored on board cryogenic components are used: fuel, e.g. liquid methane or hydrogen for feeding engines and refrigerant - for liquifying air supplied to AJE. During AJE work oxygen storage device is switched on, air is intaken into additional diffuser, part of air is liquidified in first heat exchanger during heat exchange with fuel. Other part of air is liquidified in second heat exchanger, oxygen is evaporated from air, it is pumped into tank and liquidified during heat exchange with liquid nitrogen. Liquid nitrogen is compressed by pump, heated in second heat exchanger and drained in atmosphere via AJE. Accumulated oxygen is used during LPE work.

EFFECT: production and accumulation of liquid oxygen on board of airplane, capability of AC leaving atmosphere, flight in space and returning in atmosphere with landing of AC on earth.

3 ex