Isro's new engine passes big test, paves way for heavier LVM3 launches

Isro tested its semi-cryogenic engine powerhead at full 200-tonne thrust for the first time in Mahendragiri. The result clears a key validation step for longer trials and the planned LVM3 upgrade.The Indian Space Research Organisation conducted the hot test of the Semi-Cryogenic Engine Power Head Test Article (PHTA) at the Isro Propulsion Research Complex (IPRC) in Mahendragiri, Tamil Nadu. ( Photo- ISRO)Isro successfully tested its semi-cryogenic engine powerhead at full thrust for the first time, marking a major milestone in the development of the propulsion system that will eventually boost the payload capacity of India’s LVM3 rocket.The Indian Space Research Organisation conducted the hot test of the Semi-Cryogenic Engine Power Head Test Article (PHTA) at the Isro Propulsion Research Complex (IPRC) in Mahendragiri, Tamil Nadu, on September 5, 2026.The PHTA encompasses all major engine systems except the thrust chamber and is being used to validate the performance of the semi-cryogenic propulsion system ahead of integrated engine testing. This was the ninth hot test in a series conducted using the PHTA. ( Photo- ISRO) This was the ninth hot test in a series conducted using the PHTA. More importantly, it was the first time the test article was operated at its full 200-tonne thrust level, equivalent to 100% thrust. Earlier tests had successfully demonstrated operation at 47% thrust (94 tonnes), 60% (120 tonnes), and 88% (175 tonnes).According to Isro, the latest test proceeded as predicted, with all engine parameters performing as expected. The test lasted 35 seconds, including a five-second operation of the engine powerhead at the full 200-tonne thrust level.The test also validated another critical capability, the switch-over of propellant supply from a low-pressure start tank to a medium-pressure run tank. This is an important step towards enabling longer-duration PHTA hot tests in subsequent trials.The semi-cryogenic propulsion system is being developed as part of Isro's efforts to upgrade the LVM3, India's heavy-lift launch vehicle.The Semi-Cryogenic Propulsion Stage, or SC120, will be powered by the 2000 kN-class SE2000 engine and is being developed to replace the existing L110 core stage of the LVM3.The new stage is expected to significantly enhance the launch vehicle's performance. When combined with the uprated C32 cryogenic upper stage, the semi-cryogenic stage will increase the payload-carrying capability of LVM3.The successful full-thrust PHTA test therefore represents an important validation milestone before Isro moves towards longer-duration and more comprehensive testing of the semi-cryogenic propulsion system.The development is particularly significant for India's future heavy-lift launch ambitions, as the upgraded LVM3 will provide greater capability for launching heavier spacecraft into orbit.- EndsPublished By: Zafar ZaidiPublished On: Sep 6, 2026 00:41 IST