FIELD: aviation.
SUBSTANCE: invention relates to auxiliary propeller drive systems. Helicopter propulsion system mechanical transmission drive mechanical drive (8) comprises hydraulic motor (7), mechanically connected to said connecting shaft (8), hydraulic circuit (10) for feeding liquid under pressure of said hydraulic motor (7), hydraulic valve (11) for quick opening by command, installed on hydraulic circuit, pyro-hydraulic accumulator (9) controlled by control unit (12) and connected to said hydraulic valve (11). Pyro-hydraulic accumulator (9) comprises chamber (20) containing piston (16) limiting main compartment (17) containing at least one solid-fuel cartridge (19) and compartment (18) for liquid backup. Igniting charge (25) is connected to main compartment (17) and is designed to initiate ignition of at least one solid-propellant cartridge (19) upon command of said control unit (12).
EFFECT: provides for additional mechanical power supply to the helicopter, which improves reliability of autorotation maneuver in case of gas turbine engine malfunction.
9 cl, 3 dwg
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