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Everything about LE-5

Japanese hydrolox rocket engine used on the H3 upper stage

The LE-5 liquid rocket engine and its derivative models were developed in Japan to meet the need for an upper stage propulsion system for the H-I and H-II series of launch vehicles. It is a cryogenic bipropellant design, using LH2 and LOX. Primary design and production work was carried out by Mitsubishi Heavy Industries. In terms of liquid rockets, it is a fairly small engine, both in size and thrust output, being in the 89 kN (20,000 lbf) and the more recent models the 130 kN (30,000 lbf) thrust class. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: LE-5A 5-minute orientation
  2. Pick up a classic book: Le rouge et le noirThe most-reprinted book on the subject
  3. Go sideways: Cryogenic rocket engineA closely related topic
  4. Go sideways: Expander cycleA closely related topic

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  1. LE-5A
  2. LE-5B
  3. LE-5B-2
  4. LE-5B-3
  5. Specifications

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