New Delhi: To attain total self-reliance in the launch of heavy satellites (weighing above 4 tons) and to meet future demands, the Indian Space Research Organization (ISRO) is working on a fleet of five new rockets. According to a senior official, the five Heavy-lift Launch Vehicles (HLV) are in their project report stage and in terms of design and appearance, these new fleet of rockets would be quite similar to the existing SSLV, PSLV and GSLV and GSLV Mk3 rockets, but they would be powered by even more capable, powerful and technologically advanced engines.
Presently, India pays and utilizes the services of Ariane-5, a foreign rocket, to launch satellites that weigh over 4 tons.
Speaking at a virtual event organized by ISRO and CII, N Sudheer Kumar, Director, Capacity Building Programme Office, ISRO, revealed that variants of this new fleet of heavy-lift rockets would be able to place a payload weighing anywhere between 4.9 tons to over 16 tons in the Geosynchronous Transfer Orbit (GTO).
This is an enormous improvement over the current maximum lift capability of 4 tons that the GSLV Mk3 rocket has performed to GTO.
GTO, notably, is an intermediary orbit (180 km at its closest point to earth and 36,000 km at its farthest point from earth) in which rockets place heavy satellites. After being placed in GTO, the satellites use their on-board propulsion to reach the circular orbit – 36,000 kms above the earth (it is at the same distance from the earth at any given point of time).
Being in the 36,000 km circular orbit (known as Geostationary or GSO orbit) enables communication, monitoring of a large part of the earth.
Upto three satellites in the GSO orbit are capable of covering nearly the entire globe.
According to Kumar, the work to upgrade the lift capability of GSLV Mk3 to 7.5 tons to GTO is on the verge of being concluded.
ALSO READ | Australian and Dutch space agencies are eager to collaborate with ISRO, check details
This major upgrade to India’s rocket is being made possible owing to the development of two kinds of rocket engines- a Semi-cryogenic engine that burns a special variant of Kerosene (dubbed ISROsene) and Liquid oxygen; and a Cryogenic engine that burns a mixture of Liquid hydrogen and liquid oxygen. The said Semi-Cryogenic engine stage is dubbed as SC120 and the upgraded cryogenic Engine Stage is dubbed as C32.
As per ISRO’s naming convention for rocket stages, the letter(s) refer to the type of engine fuel – Solid(S), Liquid(L), Semi-cryogenic(SC) and Cryogenic(C) and the accompanying number refers to the mass (in tons) of propellant carried. In simple words, a rocket is a combination of multiple engines(stages) that are vertically stacked.
“Soon the stage will be inducted into the rocket, then we need not depend on Foreign sources for the launch of heavy communication satellites(weighing over 4 or 5 tons),” Kumar said.
Regarding ISRO’s ongoing projects, he outlined that work was underway on the full-scale model of the Reusable Launch vehicle technology Demonstrator (RLV-TD), besides work to scale up the proto-model of the air-breathing engine.
For ISRO, these are crucial technologies to master, in order to develop a fully reusable space vehicle dubbed the ‘TSTO’ or Two Stage to Orbit.
ALSO READ | Gaganyaan spacecraft engines tested successfully by ISRO, all you need to know
The Director of ISRO’s CBPO also shared the configuration of the fleet of five heavy-lift rockets that were in their project report stage. The configurations make reference to new and more powerful rocket stages – SC400 semi-cryogenic stage, C27 Cryogenic stage, S250 Solid rocket booster.
Simply put, depending on the type of mission, payload to be lifted and rocket required, different variants of engines would be stacked vertically to run a relay race to space. Each stage would detach from the rocket after it propels the rocket to a certain altitude and speed, then the next engine would take over. This process goes on until the satellite(payload) reaches its final orbital destination.
In terms of materials, ISRO is said to be working on developing carbon-carbon composites, ceramic matrix composite for reusable vehicles, metal-foams for crash landing interplanetary probes, besides crucial components such as solar panels, fibre optics Atomic clocks, deployable antennas, lithium-ion batteries, Application Specific Integrated Circuits (ASICs) and Micro Electro Mechanical System (MEMS) Devices
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