ISRO Demonstrates New Tech That Can Be Used for Mars, Venus Missions

An IAD, designed and developed by ISRO’s Vikram Sarabhai Space Centre, was successfully test flown in a ‘Rohini’ sounding rocket from Thumba Equatorial Rocket Launching Station.

Bengaluru: ISRO on Saturday successfully demonstrated a new technology with Inflatable Aerodynamic Decelerator (IAD) that it said is a game-changer with multiple applications for future missions including to Mars and Venus.

An IAD, designed and developed by ISRO’s Vikram Sarabhai Space Centre (VSSC), was successfully test flown in a ‘Rohini’ sounding rocket from Thumba Equatorial Rocket Launching Station (TERLS).

The IAD was initially folded and kept inside the payload bay of the rocket, according to the Bengaluru-headquartered Indian Space Research Organisation (ISRO).

At around 84 km altitude, the IAD was inflated and it descended through atmosphere with the payload part of sounding rocket. The pneumatic system for inflation was developed by ISRO’s Liquid Propulsion Systems Centre (LPSC), it said.

The IAD has systematically reduced the velocity of the payload through aerodynamic drag and followed the predicted trajectory.

“This is the first time that an IAD is designed specifically for spent stage recovery. All the objectives of the mission were successfully demonstrated”, the space agency said in a statement.

“The IAD has huge potential in variety of space applications like recovery of spent stages of rocket, for landing payloads on to Mars or Venus and in making space habitat for human space flight missions”, it said.

Rohini sounding rockets are routinely used for flight demonstration of new technologies being developed by ISRO as well as by scientists from India and abroad.

In Saturday’s flight, along with IAD new elements like micro video imaging system which captured the bloom and flight of IAD, a miniature software defined radio telemetry transmitter, MEMS (Micro-electromechanical systems)-based acoustic sensor and a host of new methodologies were flight tested successfully, ISRO said.

“These will be inducted later to the major missions. Sounding rockets offers an exciting platform for experimentation in upper atmosphere”, it said.

“This demonstration opens a gateway for cost-effective spent stage recovery using the Inflatable Aerodynamics Decelerator technology and this IAD technology can also be used in ISRO’s future missions to Venus and Mars” said ISRO Chairman S Somanath, who witnessed the launch.

The Uncertainty and Obsolescence Vikram Sarabhai Saw in India’s Future

“I believe that the present is particularly threatening to those like you who embark on a professional career for the first time,” Sarabhai said in a talk to the students of IIT Madras in 1965.

Today marks the birth centenary of Vikram Sarabhai, the celebrated industrialist and innovator popularly considered to be the father of the Indian space programme.

Sarabhai founded the Physical Research Laboratory in Ahmedabad in 1947. Three years later, the Government of India set up the Department of Atomic Energy (DAE) under the aegis of Homi J. Bhabha. The two organisations subsequently undertook research on atmospheric and space science and spaceflight as well as supported similar efforts around the country. In 1962, Sarabhai set up the Indian National Committee for Space Research (INCOSPAR) with Bhabha’s support. INCOSPAR assumed responsibility for space-related studies and activities that the DAE had until then overseen. Seven years later, it was supplanted by a larger institution called the Indian Space Research Organisation, marking the start of India’s formalised spaceflight programme.

Apart from shaping ISRO in its formative years, he also established the Indian Institute of Management, a community science centre and, with his wife Mrinalini, the Darpana Academy of Performing Arts, all in Ahmedabad. Sarabhai was famously committed to pressing the applications of science and technology to the needs of the nation, and contributed to national efforts in nuclear power generation, industrial organisation, market research and physical science research as well. He passed away on December 30, 1971.

By way of commemoration, the text of Sarabhai’s convocation address delivered at IIT Madras on August 1, 1965, is presented in full below.

§

Things have changed a great deal during the last five years. Jawaharlal Nehru, Kennedy and Khrushchev are gone from the international scene. Nations already armed to the teeth have continued to engage in a spiralling arm s race and bombs rain every day from the skies over North and South Vietnam. Violence is rampant the world over. There is disenchantment with aid and with military alliances. Manned exploration of the moon and, in this country, the pursuit of engineering studies do not have the same glamour as before. Political life in Red China, in the United States and in India is chaotic and social goals perceived with cynicism. What is happening around us? Has the uncertain world come to stay with us?

The affliction is not peculiar to us; rich nations and poor ones, large and small, powerful and weak, those in military alliances, the nonaligned and the neutral, all manifest the same symptoms. The scenario is different, in France, in the United States, in Poland, in Japan and in India. And so are the methods by which societies try to deal with these problems. But a common thread runs through all these. I wish today to share with you some of my thinking, for, I believe that the present is particularly threatening to those like you who embark on a professional career for the first time.

Everyone here is undoubtedly familiar with the expression ‘three raised to the power of eighteen’. It is a large number: 38,74,20,489, thirty-eight crore, seventy-four lakh, twenty thousand, four hundred and eighty-nine. What it means in dynamic terms is quite dramatic. If a person spreads gossip to just three others and the same is passed on by each of them to three others, and so on in succession, in just eighteen steps almost the entire population of India would share the spicy story. Note that if each step takes one hour, 90% of the people hear the gossip for the first time only during the seventeenth and the eighteenth hours. Indeed, during the whole of the first 80% of the time, the process affects merely 11% of the population. Even though each individual is partaking in the chain reaction exactly like all the others, who preceded him, that is, he receives information from one person and passes it on to three others, the social impact at a late stage of development hits like an avalanche.

Villa Sarabhai in Ahmedabad, 1951-1955

Villa Sarabhai in Ahmedabad, 1951-1955

When we have a new infection, initially it is barely perceptible, but as a biological organism multiplies through successive generations, at a certain moment it suddenly permeates through the whole system. You can observe this fascinating phenomenon in making dahi or yoghurt, or thayir as you call it here. In the same way, information, knowledge, innovation, people and things diverge rapidly and their collective effects appear suddenly even though the basic process in each case has proceeded over a long time span.

When considering the social implications of technological change, one usually mentions the effects of the machine age on society through automation and imposed conformity. But these are trivial compared to the wider social implications of innovative man, who with curiosity, ingenuity and ambition, tries to reach out from his natural environment, and starts divergent processes. In nature, left to itself, control is maintained through an ecological balance. Order is not imposed from above, but arises through the interaction of each unit with its environment in a dynamic equilibrium. On the other hand, inherent in a programme of accelerated development, there is a suppression of some of the natural constraints which prevent divergence. And as the rate of innovation, of discovery and of everything else in the world gets faster and faster, so does the obsolescence of people and things become ever more acute. In contrast, biological development continues at its own pace. The child still requires nine months to develop in the womb. His life cycle of learning, of adolescence, as a house-holder and as an elder, who lays down the law, remains essentially unchanged.

Also read: A Wreath of White Roses Over the Ruins of Mehrangir, Homi Bhabha’s Home

The situation is aggravated because of the increase in the life span of the human being. The contradiction between desired longevity and a world of increasing change is obvious. An inevitable result of all this is the disillusionment of the young concerning the understanding and behaviour of the middle aged and the old. Equally serious is the inability of those who wield power and influence over world affairs to adopt values and behaviour, inherent in an order where accelerating change, rather than stability, is dominant. I suggest that today we witness a crisis of obsolescence.

An undated photograph of Vikram and Mrinalini Sarabhai with their son Karthikeya. Credit: Mid-Day

The qualitative change which has occurred in the last decade with the development of atomic energy, with the exploration and use of space, with the advent of electronics and computer sciences, is a manifestation of the divergent human function which has suddenly overtaken the world. What we have witnessed so far, dramatic as it is, is probably pedestrian compared to what we can expect in the future.

We have heard of the feasibility of areas of Earth’s surface illuminated during the night with sunlight through giant reflectors attached to satellites. We have also heard of weather modification, by increasing precipitation of rain in certain regions through artificially seeding clouds. There has been a suggestion of putting into orbit a belt of dust particles over the equator such that it would change the distribution of solar energy penetrating to different regions of the earth. It is claimed that such a belt could reduce the heat in the tropics and scatter more to high latitudes, providing a temperate climate even in the polar regions. This has many frightening possibilities because the level of the oceans would rise and submerge many inhabited areas.

New leads in biology and genetics pursued relentlessly are creating situations with implications few have thought through. Population control using the pill has tied up into knots theologists, wishing to interpret the sayings of the holy books in terms of current needs of society and new concepts of life. Just as doctors are faced with the problem of determining what death is before spare parts surgery would be justified, international lawyers rack their brains to determine an objective criterion for identifying where air space ends and outer space begins in which national sovereignty does not exist.

Affairs in the 1960s are largely in the hands of those who were already grown up when the Second World War broke out. Their learning experience and their theoretical knowledge relates principally to a period when the world was qualitatively different. The concepts of national sovereignty, of international spheres of influence, and power politics of the classical type have hardly changed even though we are constantly watched from satellites in outer space above us, and our security is threatened not merely by hostile neighbours, but by the actions and indiscretions of distant powers. What is the relevance of foreign bases in the context of long range missiles and nuclear submarines lurking unseen and silent on ocean floors? Is the Indian Ocean Indian any longer? How shall we preserve democratic states where the media of mass communications provide means of instantly reaching downwards from centres of authority, but, short of public agitation, there is no authorised channel for the reverse feedback for controlling the political system between elections?

ISRO chief K. Sivan during an event to mark Vikram Sarabhai's birth centenary. Credit: PTI

ISRO chief K. Sivan during an event to mark Vikram Sarabhai’s birth centenary. Credit: PTI

What should be the goals of education in a world of obsolescence? We find ourselves largely unprepared to meet the new situation. In real life, it makes a lot of difference how we view these occurrences. We have the situation in India, in comm on with many other countries, of students challenging the authority of universities and of the establishment. Those who assume that the students are indisciplined and wayward suggest that getting them involved in some activity such as the NCC would set matters right. On the other hand, if one regards protests of students at Columbia, at the Sorbonne and at Banaras as manifestations of a deeper malaise of society, the powers that be would introspect rather than preach. There is no easy solution.

Also read: Are ISRO and India Willing to Do What It Takes to Make It in Space?

But there is, I believe, much that we can learn from an analogue that we find in the peaceful applications of atomic energy more precisely, in the technique of extracting energy liberated in the fission of uranium. As is well-known, when an atom of the [uranium-235 isotope] is hit by neutrons, it has a tendency to split into two lighter atoms, the combined weight of the splinters being less than the weight of the original atom. In the process of fission, not only is the difference of m ass liberated as energy, but additional neutrons are released. When these neutrons hit other fissile atoms, a chain reaction occurs and the process can continue like the divergent spread of gossip.

We require a critical mass of uranium before the chain can be self-sustaining and indeed, when there is no other control device, the mass explodes through the sudden liberation of a large amount of energy on reaching criticality. This is what constitutes an atom bomb based on fission. When we wish to extract useful power out of the self-sustaining chain reaction of fission, we have to prevent the divergent release of neutrons, and of energy in the mass of the system.

This needs the establishment of a large number of control loops which constantly and simultaneously sample the level of the reaction at various points of the reacting volume and sensitively adjust the position of neutron absorbers, strategically placed at various positions in the core of the reactor. Divergent trends are almost instantly compensated. An operator can shut down the reactor by pushing neutron absorbers into the core. But no reactor can be maintained in a steady state of self-sustained activity, necessary for providing useful energy, on the basis of exclusive reliance on gross controls operated with imperfect feedback loops. Indeed, the control of potentially divergent systems relies on sensitive information loops which operate quickly in response to minute changes of activity.

Vikram Sarabhai was featured on a commemorative stamp the Government of India issued in 1972. Credit: India Post

Vikram Sarabhai was featured on a commemorative stamp the Government of India issued in 1972. Credit: India Post

What can we learn from this analogue in the social context? That control of the divergent human function cannot be maintained through the macro system of a super government. We need a system which perm its an infinite number of micro control loops spread through the fabric of society. An authoritative regime can inhibit the divergent human function, but only at the cost of inhibiting development itself. Ironically, free societies are the ones which are most prone to the social impact of run away divergencies. It is in such free societies that the power of the super state, the super authority in education and for developmental tasks, is most difficult to sustain.

I am intrigued by how closely this line of thinking brings us to Vinaobaji’s and Jayaprakash’s ideas on social and political organisation. We are faced with the problem of the divergent human function manifesting itself on the world scene, while in India we are still trying to shake ourselves free from poverty. We have, I believe, to create a social system and a pattern of development which is based not on monolithic organisations operating impersonally at an all-India level or even at the level of the states but in units where the feedback loop has high fidelity communication and a quick response.

Also read: U.R. Rao, ISRO Chairman Who Helped India’s Space Programme Settle Down

I am convinced, for instance, that our education system would immeasurably benefit if it were liberated from the monopolistic privileges under which universities take hold of all educational matters at a certain level in allotted territories. There is no way in which a University Grants Commission or an affiliating university can ensure educational standards. In the ultimate analysis, it is only the teacher in the classroom that can do anything in the matter. He has to be provided the freedom to innovate in education in a changing world and, for this innovation, he has to receive the trust of those who back him up. I would suggest that the most effective development of education can take place only when the teacher, the student, his parents and the outside environment can interact with one another, in a series of feedback loops, free from regimentation and irrelevant theories and principles preached from the top.

U.R. Rao inaugurates a bust of Vikram Sarabhai at Antariksh Bhavan, the ISRO HQ, New Delhi, 2004. Credit: ISRO

U.R. Rao inaugurates a bust of Vikram Sarabhai at Antariksh Bhavan, the ISRO HQ, New Delhi, 2004. Credit: ISRO

Engineers look forward to play a meaningful role in society. We are nationally poised to formulate a new Five Year Plan for development. Economists in the past have been prone to equate investments in hard facilities as necessary for economic growth. This is often true, but in the present context, it is largely fallacious. Twenty years after independence, w e find ourselves with a broad infra-structure of plants and facilities in the engineering industries which are largely under-utilised. We also find a number of well-established laboratories, without clear-cut developmental tasks which are meaningful in terms of national priorities. What is needed now is a major investment in design and developmental effort directed at indigenous capability for carefully chosen tasks, which are important to us.

As an example, I might cite a good transportation system: providing an inexpensive scooter or a cheap car; a mass communication system which brings television to every village in a decade; inexpensive power through the countryside based on optimisation of grids, with a combination of hydroelectric, atomic and thermal units; a defence system based largely on hardware related to our own strategic needs rather than one which is reliant on what our friends overseas choose to sell us, gift to us or help produce under their know-how. We can identify subsystems under each of these major tasks and we can create design and development groups which can operate with a wide measure of autonomy. They will require trust to be able to innovate.

All this is not a pipe dream. I hope we have the good fortune of realising these programmes before divergent functions in our society blow asunder all that we cherish.

An Open Letter to ISRO Chief K. Sivan on Promoting STEM Education in India

ISRO is a homegrown Indian success story often literally pushing against the edges of our universe, inspiring millions of people. But there’s room for it to do more.

ISRO is a homegrown Indian success story often literally pushing against the edges of our universe, inspiring millions of people. But there’s room for it to do more.

K. Sivan, chairman of the Indian Space Research Organisation. Source: Twitter

K. Sivan, chairman of the Indian Space Research Organisation. Source: Twitter

To
K. Sivan
Chairman, Indian Space Research Organisation

As the premier research establishment in the country, the Indian Space Research Organisation (ISRO) has done a great job of creating technological capacity in an area as critical as space. ISRO’s rockets, missions to the Moon and Mars and applications tailored to cater to the problems of humans and society are all laudable.

Today, there is a growing inequality in science, technology, engineering and mathematics (STEM) education in India. In the 21st century, we need our children to learn certain skills and design-based learning to spur curiosity and innovation. There is also a conspicuous issue of lack of resources to invest in building teaching capacity and creating experiment-based hands-on learning environments at the grassroots level, and this affects the quality of graduates in India.

ISRO has been the most successful public-sector innovator in the country. It has a responsibility to foster the scientific temper in schools and colleges. While the organisation has been conducting several outreach-related initiatives, including competitions held at various ISRO centres, supporting student satellite missions, etc., there is no overarching roadmap towards nurturing STEM in India as such.

I take this opportunity to present to you a few areas where ISRO can provide a foundation to inspire millions of students across India.

Upgrading restricted access museums to open-access public laboratories

ISRO has museums in each of its major centres – such as the Satellite Assembly Centre (ISAC), the Vikram Sarabhai Space Centre (VSSC), the Satish Dhawan Space Centre (SDSC), etc. However, access to these museums – excluding the one at the SAC – are restricted because they are within ISRO campuses (which have security protocols). So moving these museums into a restriction-free zone will allow the general public to visit them more often.

Such a template already exists in the country, with Hindustan Aeronautics Limited having created a museum in Bengaluru with access to various aircraft, helicopter and engine models, flight simulators, a mock air traffic control tower and an exhibit focusing on of India’s aviation history.


Also read: India’s space and nuclear labs are visibly lacking in outreach efforts


Another template is the ‘School Labs’ initiative taken up by the German Space Agency. It offers young people an opportunity to learn about its operations, the work of its scientists and experiments being conducted under various projects.

Such an initiative by ISRO in its various centres in the country will help inspire the next generation of scientists by showcasing its state-of-the-art equipment, often of the kind schools generally don’t have. A visit to such a lab could supplement classroom lessons and help translate theoretical knowledge to its practical counterpart. If school students become fascinated, it will surely make STEM disciplines more desirable among young people in the country.

A physical storefront at these labs, together with an online store, will also help: they could manufacture and sell low-cost models of rockets, satellites and other merchandise to spread the word on ISRO’s role in our society.

Social media engagement

One of the highlights of the Mars Orbiter Mission (MoM) in 2014 that caught the people’s imagination was the live social media outreach. There was even a conversation between members of the team responsible for NASA’s Curiosity rover and those from MoM that went viral. But today, the outreach seems limited to general announcements issued by the organisation.

Given the growing influence of social media on young people, we need to create a social media strategy for STEM outreach, and there is no better institution in the country than ISRO that can carry this baton forward. ISRO’s peers, such as NASA and ESA, have also set up dedicated television channels and YouTube playlists, apart from being active on Facebook, Twitter, Instagram, etc., to promote space applications. I hope that under your leadership, ISRO will finally create an institutional strategy for outreach via the social media.

Viewing launches at SHAR

I recently had a chance to view a launch from the ISRO launchpad at Sriharikota. It was a splendid experience. However, the process of securing a viewer’s pass was anything but. In the time of ‘Digital India’, ISRO needs to consider providing access to view launches at the Sriharikota Range through an online booking system functioning on a first-come-first-served basis. This way, the burden on employees within ISRO (whom people approach for the passes) will be reduced; more importantly, people could also undergo a hassle-free online identity verification process to gain access.

Internships and doctoral programmes at ISRO centres

There are no standardised tracks at the moment to invite interns to work at ISRO, and undergraduate students trying for such opportunities from the outside find it very difficult to break through. Some forms of nepotism are also not unheard of; consider this answer to a question on Quora by an ISRO scientist: “Generally relatives of ISRO employees and/or the local students (same state in which the centre is situated) are preferred.” Formally soliciting applications via an institutionalised process can help provide equal opportunities to students around the country.

Similarly, one of the other problems that Indian higher education has been grappling with is the value and volume of doctoral research. While the Indian Institute of Space Science and Technology (IIST) does provide some opportunities, joint initiatives with premier academic institutes (such as the IITs, NITs, IISERs, IIMs, etc.) for PhDs with a focus on space can help to, among other things, create spin-offs, technology transfers, etc.

In sum, ISRO is a homegrown Indian success story often literally pushing against the edges of our universe, inspiring millions of people. So I hope that, under your leadership, it can expand its contributions to kindling more interest in STEM research in the country.

Narayan Prasad is a NewSpace enthusiast.

ISRO To Launch SAARC Satellite in March 2017

Narendra Modi, during the SAARC summit in Nepal in November 2014, had announced launching of a SAARC satellite as a gift for the benefit of members of the regional grouping in various fields, including telecommunication and telemedicine.

Representational image. Credit: ISRO

Representational image. Credit: ISRO

India’s ambitious South Asian satellite, proposed by Prime Minister Narendra Modi for the benefit of SAARC members, will be launched in March next year, ISRO Chairman A. S. Kiran Kumar said on Tuesday. The satellite was originally scheduled to be launched in December. “SAARC satellite will be launched in March,” he told reporters.

Modi, during the SAARC summit in Nepal in November 2014, had announced launching of a SAARC satellite as a gift for the benefit of members of the regional grouping in various fields, including telecommunication and telemedicine.

Since Pakistan has ‘opted out’ of the project, it is now being called the South Asian satellite.

India had held deliberations with experts from other SAARC countries to finalise modalities for the satellite exclusively for the regional grouping.

On GSLV Mark III that is likely to be launched in December, the ISRO chairman said preparations were on in “full swing”.

“We have started the assembly for the launch in Sriharikota. So we are working towards making it happen as early as possible and are targeting for launch by December end.”

The rocket programme is crucial for ISRO as it would help the country launch satellites weighing around four tonnes.

To a question about plans to improve manpower and infrastructure facilities, he said. “We need to do more work [which] means we need to have more hands.”

On the third launch pad, the ISRO chief said it was necessary to make sure that the existing facility was being fully utilised.

Earlier, he addressed around 1,000 sportspersons drawn from 14 ISRO centres who are participating in the inter-centre sports meet, saying such activities helped to break barriers and reinvigorate mentally and physically, besides improving team work.

Vikram Sarabhai Space Centre Director Dr K. Sivan was also present.

ISRO Postpones Scramjet Test to Help Find Missing Air Force Plane

A new date has not been finalised for the scramjet engine test after ISRO decided the search took precedence over the experimental mission.

A new date has not been finalised for the scramjet engine test after ISRO decided the search took precedence over the experimental mission.

The RH-560 sounding rocket during a test in March 2010. Source: ISRO

The RH-560 sounding rocket during a test in March 2010. Source: ISRO

The Indian Space Research Organisation has put off testing a new kind of engine it built in July after an AN-32 plane, of the Indian Air Force, disappeared over the Bay of Bengal on July 22 with 29 onboard. The Air Force has sought ISRO’s assistance in tracking the plane down.

ISRO had planned to test its indigenous scramjet engine this month. The engine will eventually power the organisation’s reusable launch vehicle, expected to be ready in 2030. The test was going to see the engine, fit on a modified RH-560 sounding rocket and lifted to 70 km, fire for five seconds while travelling at Mach 6 (2 km/s). A scramjet engine ‘inhales’ the oxygen it needs to burn the fuel from the atmosphere, sparing the carrier vehicle the need to carry oxidisers and relieving additional payload space. The entire test was planned to span 260 seconds.

However, it was called off because the Air Force sought ISRO’s assistance in tracking the plane, after it went off the radar while en route to Port Blair from Chennai on July 22. Thirteen vessels of the Navy and two of the Coast Guard, apart from some others by the Air Force, have been deployed for the search. Satellite images are being sourced from ISRO while personnel from the National Institute of Ocean Technology are also helping zero in on the plane.

The New Indian Express reported K. Sivan, director of the Vikram Sarabhai Space Centre, Thumba, as acknowledging that the search took precedence over the experimental mission. He added that a new date for the scramjet engine test hadn’t yet been finalised either.

After Successful Test of Reusable Vehicle, ISRO Has Further Plans for Slashing Launch Costs

ISRO’s immediate priorities are to make its own launch vehicles more reliable, increase the payload they are able to carry and reduce the cost of their manufacturing.

ISRO’s immediate priorities are to make its own launch vehicles more reliable, increase the payload they are able to carry and reduce the cost of their manufacturing.

ANI images showing the solid-fuel booster lofting the RLV technology demonstrator before the descent begins. Source: ANI_news/Twitter

ANI images showing the solid-fuel booster lofting the RLV technology demonstrator before the descent phase begins. Source: ANI_news/Twitter

On Monday morning, the Indian Space Research Organisation successfully flight tested its ‘Reusable Launch Vehicle – Technology Demonstrator’ (RLV-TD) from the Satish Dhawan Space Centre (SDSC) in Sriharikota, Andhra Pradesh. This winged craft, with its distinctive twin tail-fins, is intended as a key step toward the space agency’s goal of creating a reusable launch vehicle that could cut launch costs by as much as nine-tenths.

In the flight test, the RLV-TD was carried aloft by a rocket booster and reached an altitude of about 65 km. It then descended, reaching a peak velocity of five times the speed of sound, before landing in the Bay of Bengal about 13 minutes later. “The vehicle’s navigation, guidance and control system accurately steered the vehicle during this phase for safe descent,” an ISRO release said, and the craft successfully survived the “high temperatures of re-entry with the help of its Thermal Protection System.”

ISRO’s current conception for such a reusable launcher is to have a two-stage-to-orbit configuration. A winged first stage would incorporate an advanced air-breathing propulsion system that takes in air as it flies to burn the fuel carried onboard. This stage would take the second stage and payload high up into the atmosphere and, after separating from the latter, return to land on a runway.

The second stage would accelerate the payload the rest of the way using conventional rocket propulsion. Afterward, this second stage too would be brought back to the ground. However, such an advanced launch vehicle may materialise only “some 20 years from now”, according to K. Sivan, director of the Vikram Sarabhai Space Centre in Thiruvananthapuram, ISRO’s lead centre for launch-vehicle development.

But with SpaceX, the American spaceflight company started by entrepreneur Elon Musk, promising to achieve rocket reuse and bring about lower launch costs with existing technology, ISRO has some plans to ensure it remains competitive in the short-term as well.

SpaceX’s Falcon 9 rocket, with just two stages powered by liquid engines, has carried satellites into orbit and sent its Dragon capsule, loaded with cargo, to dock with the International Space Station. On three such flights, the rocket’s first stage, after separating from the second stage, fired its engines again and successfully made a controlled descent back to earth. On one occasion, it returned and made a vertical touchdown a short distance from the launch pad it had left a short time earlier. Then, in two recent flights, it landed on a drone ship stationed out in the ocean.

SpaceX intends to reuse the first stages that return but has yet to demonstrate this capability. The company’s president, Gwynne Shotwell has indicated that such reuse could lead to a 30% saving in costs.

Sivan made it clear that ISRO’s immediate priorities are to make its own launch vehicles more reliable, increase the payload they are able to carry and reduce the cost of their manufacturing. If the Geosynchronous Satellite Launch Vehicle (GSLV), which can launch a 2.2-tonne communications satellite, is able to carry a 3.5-tonne satellite, “the vehicle becomes more efficient,” he remarked. And with vehicle cost remaining unchanged, the cost per kg for the satellite it launches comes down.

In the case of the next generation GSLV Mk-III rocket, its payload capability could be increased from four tonnes to six tonnes. Then, substituting a semi-cryogenic engine, which is currently being developed, for the two Vikas liquid propellant engines in the rocket’s core booster could further raise its payload to 7.5 tonnes.

Vehicle costs could also be reduced. One measure being considered is to shift from maraging steel used for the big solid boosters that form the first stage of the PSLV and the GSLV to a cheaper steel, Sivan said.

In addition, ISRO was “very seriously” thinking of retrieving and reusing the core boosters of the GSLV and GSLV Mk-III in a SpaceX-like manner, according to him. The next generation Heavy Lift Launch Vehicle could also be designed with such reuse in mind.

The GSLV’s first stage, along with the four liquid-propellant strap-on boosters attached to it, account for almost three-fourths of the launch vehicle’s costs. “If we are able to recover and reuse [it], our reduction in cost will be maximum,” he said.

The GSLV’s payload would be halved if the the rocket’s first stage and strap-ons were manoeuvred back to the SDSC. However, the loss in payload would come to only about 80 kg if the stage soft-landed where it would naturally fall after separation. India could take advantage of the Andaman Islands and get the first stage to land there after equatorial launches from Sriharikota, Sivan remarked.

Gopal Raj is a science journalist based in Thiruvananthapuram. He has written extensively about the Indian space programme, including a book, Reach for the Stars: The Evolution of India’s Rocket Programme.