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BT-4
Part of AS 2100 Family
Pressure-fed liquid propellant engine developoed by IHI Aerospace of Japan. Originally developed for the cancelled LUNAR-A, later adopted internationally for use as the apogee engine for geostationary communications satellites (A2100 and GEOStar-2 buses), and the HTV and Cygnus automated cargo spacecraft. The thruster was built on the technology base from license build of the second stage attitude control system for the N-1 rocket in the 1970's, followed by the first indigenous-design Japanese thrusters for the ETS-4 (Kiku-3) satellite in the 1980's.

Thrust: 500 N (110 lbf). Gross mass: 4.00 kg (8.80 lb). Height: 0.80 m (2.62 ft).



Country: Japan. Propellants: N2O4/N2H4. Agency: IHI.

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