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ISRO conducts hot test of semi-cryogenic engine power head at 175-tonne thrust

5 min readSource: ISROArticle 2 of 10

The Indian Space Research Organisation (ISRO) successfully conducted a hot test of its Semi-Cryogenic Engine Power Head Test Article (PHTA) at a 175-tonne thrust level, equivalent to about 88% of its target, at the ISRO Propulsion Complex (IPRC), Mahendragiri, Tamil Nadu on June 24, 2026 (announced June 27). It was the eighth test in the PHTA series, following earlier firings at 47% (94 tonne) and 60% (120 tonne) thrust. The test demonstrated stable, steady-state operation at higher thrust and builds confidence toward a full 200-tonne thrust demonstration. The semi-cryogenic engine, which uses refined kerosene and liquid oxygen, is meant to power heavier upgraded versions of India's LVM3 launch vehicle and future deep-space missions.

Key Facts & Details

9 points
  • 1
    ISRO hot-tested its Semi-Cryogenic Engine Power Head Test Article (PHTA) at 175-tonne thrust (about 88% of target).
  • 2
    The test was conducted at the ISRO Propulsion Complex (IPRC), Mahendragiri, Tamil Nadu, on June 24, 2026.
  • 3
    It was the eighth PHTA test; earlier tests reached 47% (94 T) and 60% (120 T) thrust.
  • 4
    The test showed stable steady-state operation at higher thrust.
  • 5
    It builds toward a full 200-tonne thrust semi-cryogenic engine.
  • 6
    The engine uses refined kerosene and liquid oxygen and will power upgraded LVM3 rockets.

Deep Dive

  • +
    Semi-cryogenic propulsion offers higher thrust and is more environment-friendly and cost-effective than fully cryogenic stages using liquid hydrogen.
  • +
    The engine is intended to replace the liquid core stage of the LVM3, boosting its payload capacity significantly.
  • +
    Mastery of semi-cryogenic technology supports India's heavy-lift and human-spaceflight ambitions.
Q

Exam Focus

At what thrust level did ISRO hot-test its semi-cryogenic engine power head in June 2026?

Related Topics

ISROSemi-cryogenic engineLVM3Space technology

Exam Relevance & Angle

ISRO milestones are high-frequency S&T GA. The engine (semi-cryogenic / PHTA), the 175-tonne thrust, the venue (IPRC Mahendragiri) and the LVM3 link are precise exam hooks.

Target Exams

SBI POSBI ClerkIBPS POIBPS ClerkIBPS RRB OfficerIBPS RRB AssistantRBI Grade BRBI AssistantNABARD Grade ASSC CGLSSC CHSLRRB NTPCLIC AAOUPSC CSEState PCS

Background & Context

A semi-cryogenic engine burns refined kerosene (a liquid fuel) with liquid oxygen (LOX) as the oxidiser; unlike a fully cryogenic engine (which uses liquid hydrogen at extremely low temperatures), only the oxidiser is cryogenic, making it higher-thrust, cheaper and easier to handle. ISRO is developing a 2,000 kN (about 200-tonne) semi-cryogenic engine to power an upgraded liquid core stage of the LVM3 (Launch Vehicle Mark-3), India's heaviest operational rocket. The ISRO Propulsion Complex (IPRC) at Mahendragiri, Tamil Nadu, is the agency's main facility for testing liquid and cryogenic propulsion systems. A Power Head Test Article (PHTA) validates the engine's turbopump and pre-burner systems.

Related GK Concepts

Must Know
Semi-cryogenic engineLVM3IPRC MahendragiriCryogenic engineLiquid oxygen

Test Yourself

1 / 2

ISRO's June 2026 semi-cryogenic engine power-head hot test was conducted at what thrust level?

Source

ISRO

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ISRO conducts hot test of semi-cryogenic engine power head at 175-tonne thrust — Current Affairs 2026-06-27