ISRO Semi-cryogenic Engine Hot Test and NISAR Launch Prep
Why in the news
ISRO completed another short hot test of its semicryogenic engine, while launch preparations for the NASA-ISRO NISAR satellite also moved ahead.
Test details
| Parameter | Detail |
|---|---|
| Location | ISRO Propulsion Complex (IPRC), Mahendragiri |
| Duration | 3.5 seconds |
| Article tested | Engine Power Head Test Article, without thrust chamber |
| Power level | 60% of rated power |
| Outcomes | Stable, controlled run; start-up sequence validated |
| Earlier test | First hot test on March 28 |
About semi-cryogenic engines
- Liquid rocket engine burning refined kerosene with liquid oxygen as oxidiser.
- Fully cryogenic engines use liquid hydrogen with liquid oxygen.
- Kerosene is lighter, easier to store and cheaper than liquid hydrogen, helping handling and cost.
Purpose and plans
- Tests check design integrity of subsystems such as low- and high-pressure turbo pumps, pre-burner and control systems.
- Results help fix the operating sequence of the full engine.
- More qualification tests will follow before use in ISRO launch vehicles.
NISAR preparations
- Launch vehicle: GSLV-F16; campaign has begun at Sriharikota.
- On March 24, 2025, the GS2 liquid stage was flagged off from IPRC Mahendragiri to Sriharikota, with ISRO Chairman V. Narayanan present.
Exam angle
- Propellants: LOX plus refined kerosene.
- NISAR: NASA-ISRO Synthetic Aperture Radar, on GSLV-F16.