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Semi-Cryogenic Engine Test 2026

Jun 28, 2026

Overview 

ISRO successfully conducted the eighth hot test of its semi-cryogenic engine power head at Mahendragiri, Tamil Nadu. The test achieved 175 tonnes of thrust, marking significant progress toward the SC120 propulsion stage. The engine will power the upgraded LVM3 launch vehicle and strengthen India's future satellite and deep-space missions.

ISRO Achieves Another Milestone in Rocket Propulsion

The Indian Space Research Organisation (ISRO) has successfully completed the eighth hot test of its semi-cryogenic engine power head at the ISRO Propulsion Complex (IPRC) in Mahendragiri, Tamil Nadu on 24 June 2026 .

The engine generated 175 tonnes of thrust , achieving nearly 88% of its target performance . This successful test is another important step toward developing India's next-generation launch vehicles.

The full-thrust demonstration of 200 tonnes is expected in the next phase of testing.

What Is a Semi-Cryogenic Engine?

A rocket needs powerful engines to lift heavy satellites into space.

A semi-cryogenic engine uses liquid oxygen (LOX) as the oxidiser and kerosene as the fuel. This combination produces high thrust while keeping the propulsion system more efficient and cost-effective than many traditional rocket engines.

Think of it like upgrading a vehicle with a stronger engine that carries heavier loads while using fuel more efficiently.

What Was Tested?

ISRO tested the Power Head Test Article (PHTA) of its semi-cryogenic engine.

The power head is the heart of the engine. It includes major systems such as:

  • Turbopumps
  • Gas generator
  • Control systems
  • Feed lines

Testing the power head allows engineers to verify that these critical components work safely and efficiently before the complete engine is tested.

This was the eighth hot test in the ongoing Power Head Test Article series.

The SC120 Semi-Cryogenic Propulsion Stage

The new propulsion stage is called SC120 .

It is powered by the SE2000 engine , which has a design thrust of 2,000 kilonewtons (2 MN) .

The SC120 stage is being developed to replace the current L110 core stage of India's LVM3 launch vehicle.

The upgrade is expected to improve payload capacity and increase mission efficiency.

Propellants Used in the Engine

The semi-cryogenic engine uses two propellants:

  • Liquid Oxygen (LOX) – acts as the oxidiser.
  • Kerosene (RP-1 type hydrocarbon fuel) – serves as the fuel.

This propellant combination is widely used in modern launch vehicles because it delivers:

  • High thrust
  • Better fuel efficiency
  • Lower operating costs
  • Reliable engine performance

Why Is This Test Important?

The successful hot test moves India closer to deploying a more powerful version of the LVM3 launch vehicle.

An upgraded launch vehicle will help India:

  • Launch heavier communication satellites.
  • Support future human spaceflight missions.
  • Carry larger scientific payloads.
  • Improve deep-space exploration missions.
  • Increase commercial launch opportunities.

The new propulsion system will also strengthen India's position in the global space industry.

Previous Engine Tests in 2026

ISRO has carried out several important propulsion tests during 2026.

CE20 Cryogenic Engine Test

In March 2026 , ISRO successfully conducted a sea-level hot test of the CE20 cryogenic engine at a thrust level of 22 tonnes .

PS4 Engine Using Additive Manufacturing

On 9 May 2026 , ISRO tested a redesigned PS4 engine manufactured using Additive Manufacturing (3D printing) technology.

This modern manufacturing method reduces production time, lowers costs, and allows engineers to produce lighter and more efficient engine components.

Understanding Additive Manufacturing (ELI5)

Imagine building a toy by stacking one thin layer at a time until it is complete.

That is how Additive Manufacturing , or 3D printing , works.

Instead of cutting away material, the machine builds each component layer by layer using a digital design. This method saves material, reduces manufacturing time, and creates complex parts that are difficult to produce using traditional methods.

ISRO is increasingly adopting this technology to improve rocket engine production.

ISRO Propulsion Complex, Mahendragiri

The ISRO Propulsion Complex (IPRC) at Mahendragiri, Tamil Nadu , is one of India's most important rocket engine testing facilities.

The centre is responsible for:

  • Testing rocket engines
  • Evaluating propulsion systems
  • Integrating propulsion stages
  • Supporting launch vehicle development

Many of ISRO's advanced propulsion technologies are tested here before being used in actual space missions.

Future of India's Heavy-Lift Launch Vehicle

The enhanced LVM3 equipped with the SC120 semi-cryogenic stage is expected to become operational around 2027 .

Once fully developed, the upgraded launch vehicle will:

  • Carry heavier payloads into orbit.
  • Improve launch efficiency.
  • Support ambitious space exploration missions.
  • Expand India's commercial launch capabilities.
  • Strengthen future Gaganyaan and planetary missions.

The upcoming full-thrust test of 200 tonnes will be another major milestone in this journey.

Exam-Focused Cheat Sheet

  • Organisation: ISRO
  • Test Date: 24 June 2026
  • Test Location: ISRO Propulsion Complex (IPRC), Mahendragiri, Tamil Nadu
  • Engine: SE2000 Semi-Cryogenic Engine
  • Propulsion Stage: SC120
  • Achieved Thrust: 175 tonnes
  • Target Thrust: 200 tonnes
  • Performance Achieved: 88%
  • Test Number: Eighth Power Head Hot Test
  • Fuel: Kerosene
  • Oxidiser: Liquid Oxygen (LOX)
  • Launch Vehicle: LVM3
  • Stage Being Replaced: L110 Core Stage
  • Expected Operational Year: Around 2027
  • Related Technology: Additive Manufacturing (3D Printing)

FAQs

1. What is a semi-cryogenic engine?

A semi-cryogenic engine uses liquid oxygen as the oxidiser and kerosene as the fuel to generate high thrust efficiently.

2. What was achieved in the latest ISRO hot test?

ISRO successfully generated 175 tonnes of thrust , which is about 88% of the engine's target performance.

3. What is the SC120 propulsion stage?

SC120 is ISRO's next-generation semi-cryogenic propulsion stage that will replace the L110 core stage of the LVM3 launch vehicle.

4. Where was the engine tested?

The engine was tested at the ISRO Propulsion Complex (IPRC) in Mahendragiri, Tamil Nadu .

5. Why is this test important for India?

The successful test supports the development

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