As project director of the C25 cryogenic project for the LVM3 vehicle, he led the development of the C25 cryogenic stage powered by a 20-tonne thrust engine, which was crucial for the successful maiden launch of LVM3.His M.Tech thesis and PhD work were instrumental in the development of these systems, making India one of only six countries with indigenous cryogenic technology.Narayanan played a vital role in India’s lunar missions.For Chandryaan-2 and 3, he led the development of the L110 Liquid Stage, the C25 Cryogenic Stage, and propulsion systems that enabled the spacecraft to reach the Moon’s orbit and achieve a soft landing.For the PSLV C57/Aditya L1 mission, he oversaw the realisation of the second and fourth stages, control power plants, and the propulsion system that helped position the spacecraft in a halo orbit at L1, making India the fourth country to successfully study the Sun.Narayanan has been instrumental in the Gaganyaan programme, contributing to the human-rating of the LVM3 vehicle and the development of various systems, including cryogenic stages, life support systems, and propulsion systems for the crew and service modules.He also chaired the Gaganyaan Certification Board, overseeing the certification process for multiple systems.Under his leadership, ISRO has advanced the development of next-generation propulsion systems, including a 200-tonne thrust LOX-Kerosene semi-cryogenic rocket system, a 110-tonne thrust LOX-Methane engine, and electric and green propulsion systems for spacecraft.He has also guided the propulsion systems for upcoming missions such as the Venus Orbiter, Chandrayaan-4, and the Bharatiya Antariksha Station (BAS).He is a Fellow of the Indian National Academy of Engineering, Aeronautical Society of India, Astronautical Society of India, and other esteemed organizations.
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