ISRO successfully tests boot-strap mode start on CE20 cryogenic engine
Bengaluru (PTI): The ISRO on Wednesday announced that it has successfully demonstrated the boot-strap mode start test of the CE20 Cryogenic engine, which powers the upper stage of the Launch Vehicle Mark -3 (LVM3) rocket.
The test was conducted for 10 second under vacuum conditions at the High-Altitude Test (HAT) facility at ISRO Propulsion Complex, Mahendragiri on November 7, it said.
According to ISRO, the CE20 cryogenic engine is already qualified for operation at thrust levels between 19 and 22 tonnes with a single start in flight and is cleared for use in the Gaganyaan missions.
Under normal conditions, the engine ignition begins under tank head pressure, followed by a turbopump start up using a stored gas start-up system, the space agency said. For future missions, multiple in-flight restarts of the CE20 engine will be required for mission flexibility, towards multi-orbit missions.
With the current configuration, each restart requires an additional start-up gas bottle and associated systems, leading to a reduction in vehicle payload capability, it said. "Hence, achieving boot-strap mode start - where the engine builds up to steady operation without external start-up assistance - is essential."
During the test, a multi-element igniter was employed in both the thrust chamber and gas generator to facilitate boot-strap starting, the agency added.
"In this test, following the ignition of the thrust chamber, the gas generator was ignited under tank head conditions, and the turbopumps were started without the use of the start-up system. Subsequently, boot-strap mode build-up and steady-state operation of the engine were successfully demonstrated," it said.
"With this achievement, ISRO has successfully demonstrated boot-strap mode starting of a gas-generator cycle cryogenic engine without any auxiliary start-up system, perhaps for the first time in the world - a significant milestone towards enhancing the restart capability and mission flexibility of future LVM3 flights," it added.
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Lt Gen NS Raja Subramani to be India's next Chief of Defence Staff
New Delhi (PTI): Lt Gen NS Raja Subramani will be India's new Chief of Defence Staff (CDS) and his key task is set to be to implement the ambitious theaterisation plan that seeks to ensure tri-services synergy.
He will succeed Gen Anil Chauhan whose tenure will come to an end on May 30.
Gen Chauhan, a former Eastern Army Commander, took charge as the country's senior-most military commander in September 2022, over nine months after the first CDS, General Bipin Rawat, died in a helicopter crash in Tamil Nadu.
The government has appointed Lt Gen NS Raja Subramani (Retd) as the Chief of Defence Staff, who will also function as the secretary of the Department of Military Affairs, the defence ministry said on Saturday.
Lt Gen Subramani is currently serving as the military adviser to the National Security Council Secretariat.
Prior to that, he was the Vice Chief of the Army Staff from July 1, 2024 to July 31, 2025, and was General Officer Commanding-in-Chief of the Central Command from March 2023 till June 2024.
As Chief of Defence Staff, Lt Gen Subramani's primary task will be to implement the theaterisation model to bring in tri-services synergy by rolling out integrated military commands.
The officer is a graduate of the National Defence Academy and the Indian Military Academy. He was commissioned into the eighth battalion of the Garhwal Rifles on December 14, 1985.
Lt Gen Subramani is an alumnus of Joint Services Command Staff College, Bracknell (UK), and the National Defence College, New Delhi. He holds a Master of Arts degree from King's College London and an MPhil in defence studies from Madras University.
In his illustrious career spanning over 40 years, Lt Gen Subramani has served across a wide spectrum of conflict and terrain profiles and tenanted a host of Command, Staff and Instructional appointments.
He commanded the 16 Garhwal Rifles in Counter-Insurgency operations in Assam as part of Operation Rhino, the 168 Infantry Brigade in Jammu and Kashmir, and the 17 Mountain Division in the Central Sector, all during a challenging operational environment.
He also has the distinction of commanding two Corps, including the Indian Army's premier strike Corps on the Western Front.
