Country of originJapan
ManufacturerMitsubishi Heavy Industries
Applicationsustainer engine
Associated L/VH3 Launch Vehicle
StatusIn Development
Liquid-fuel engine
PropellantLiquid oxygen / Liquid hydrogen
Mixture ratio5.9
CycleExpander Bleed cycle
Nozzle ratio37
Thrust (vac.)1,471 kN (331,000 lbf)
Thrust-to-weight ratio62.50
Chamber pressure10.0 MPa (1,450 psi)
Isp (vac.)426 s (4.18 km/s)
Length3.8 m
Dry weight2.4 t (5,300 lb)
Used in
H3 Launch Vehicle core stage.

The LE-9 is a liquid cryogenic rocket engine burning liquid hydrogen and liquid oxygen in an expander bleed cycle. Two or three will be used to power the core stage of the H-3 launch vehicle.[1][2][5]

See also


  • Japanese Wikipedia LE-X (in Japanese)
  1. ^ a b Atsumi, Masahiro; Yoshikawa, Kimito; Ogawara, Akira; Onga, Tadaoki (December 2011). "Development of the LE-X Engine" (pdf). MHI Technical Review. 48 (4): 36–43. Retrieved 2015-07-08.
  2. ^ a b Kumada, Nobuhiko; Ogawara, Akira; Manako, Hiroyasu; Onga, Tadaoki; Sunakawa, Hideo; Kurosu, Akihide; Iizuka, Nobuyuki; Noda, Keiichiro; Okita, Koichi (2010-07-26). "Highly Reliable Design Approaches for Next Booster Engine LE-X" (pdf). 46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. 46 (AIAA 2010-6853). Retrieved 2015-07-08.
  3. ^ Watanabe, Daiki; Imai, Kazuhiro; Ogawara, Akira; Yamanishi, Nobuhiro; Neghishi, Hideyo; Kawatsu, Kaname; Kurosu, Akihide; Noda, Keiichiro (2011-07-31). "Application of High Fidelity Simulation to LE-X Engine Development" (pdf). 47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. 47 (AIAA 2011-5930). Retrieved 2015-07-08.
  4. ^ Daiki, Watanabe; Manako, Hiroyasu; Onga, Tadaoki; Tamura, Takashi; Ikeda, Kazufumi; Isono, Mitsunori (December 2016). "Combustion Stability Improvement of LE-9 Engine for Booster Stage of H3 Launch Vehicle" (pdf). MHI Technical Review. 53 (4): 28–35. Retrieved 2017-06-29.
  5. ^ "2020年:H3ロケットの目指す姿" [2020: H3 projected debut date] (pdf) (in Japanese). JAXA. 2015-07-08. Retrieved 2015-07-08.

External links

  • Mitsubishi Heavy Industries Ltd. Rocket Engines