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ISRO’s second short hot test of semi-cryogenic engine
July 19 , 2025
16 hrs 0 min
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- The ISRO has successfully conducted a short duration hot test of the semi-cryogenic engine at ISRO Propulsion Complex (IPRC), Mahendragiri.
- This test involves briefly firing the engine using actual fuel to verify its ignition and performance under real operating conditions.
- In this test, the Engine Power Head Test Article, encompassing all engine systems except the thrust chamber.
- The thrust chamber was subjected to a hot test for a duration of 3.5 seconds.
- That validated the engine start-up sequence.
- During the test, the engine was successfully ignited and operated up to 60% of its rated power level, demonstrating stable and controlled performance.
- The Semi Cryogenic Engine is a liquid rocket engine that uses liquid oxygen (LOX) as an oxidizer and refined kerosene (RP-1) as fuel.
- It was designed to power the booster stages of future heavy-lift launch vehicles.
- Semi-cryogenic engine's LOX-kerosene combination offers higher density impulse than cryogenic systems, enhancing propulsion performance.
- Additionally, kerosene is cheaper and easier to handle than the liquid hydrogen, reducing costs and simplifying operations.
- It will boost ISRO’s payload capacity and support future launch vehicles like the Next Generation Launch Vehicle (NGLV).
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