great, private sector participation will bring in more & better talent to the industry.Agnikul Cosmos has a very simple launch vehicle development strategy. They are developing the Agnibaan launcher which will have 5 configurations. The configurations will depend on engine clustering. The first stage could have 4, 5, 6 or 7 engines. An optional third “baby” stage will be available too.
View attachment 20619
The elegance of their strategy is that the whole thing relies on just 1 engine named "Agnite/Agnilet". Just one engine for the whole launcher. The logistical gain from that alone would be great. Oh and the engine is a single piece 100% 3D-printed. So the engine making process is completely automated & can be sped up exponentially.
Agnite/Agnilet engine specs:
Propellant: LOX/Kerosene semi-cryogenic
Thrust: 25 kN (Sea Level)
Specific Impulse: 285 sec (Sea Level) & 355 sec (Vacuum Optimized)
Engine cycle: Gas generator (probably)
Feed: Pressure fed (for now)/Electric pump fed(soon)
Cooling: Integrated Regenerative cooling
Agnite is the world's 1st 100% 3D printed engine that has been test fired. Here is the engine just after printing:
View attachment 20618
And this is after testing:
View attachment 20620
Notice the discolouration, common feature of engine after a few rounds of firing. Also the threaded part on top right has cracked. The engine has been test fired multiple times at the IIT-Madras test bed:
View attachment 20616
In the initial tests the LOX was being pressure fed to simplify things. Agnikul has started making electric pumps to feed LOX recently. The pumps are >90% 3D printed.
Testing the engines with the new pumps have started. Agnikul is receiving technical support from ISRO & IIT Madras. The Agnite engine has been in development for at least 3 years. It should complete development soon.
View attachment 20617
Given the relatively modest thrust of the Agnite/Agnilet engine & the fact that its semi-cryogenic should mean the engine is highly throttleable. If that's the case then the 1st stage may be recoverable. They have already proven its repeatability in tests, meaning the recovered engines can be fired again. Pretty sure they wont be trying that on the 1st flight, but still an interesting possibility for the future.
Since the entire rocket relies on this engine, if it is ready the rocket will be ready soon after. In fact Agnikul intends to do its 1st commercial launch on 2022. They even plan to 3D print the entire rocket. Would be awesome if they can maintain that deadline even with COVID. Skyroot's Vikram I rocket also intends to have its 1st launch in mid 2022. Will write about Skyroot some other day. ISRO's SSLV will have its 1st launch on late 2021 or early 2022. So optimistically we could get 3 new small satellite launchers by next year. ISRO' NSLV could also have its 1st launch in 2022, though that has not been confirmed.
Anyway hers are 2 blog post from one of Agnikul Cosmos' founders. They are a few months old :
What really is a “single piece” rocket engine & why we make these at Agnikul? (part 1/n)
By Srinath Ravichandran
Let’s start with some basics. What is a rocket engine? In its simplest form, a rocket engine is a device that is capable of burning gases and sending them out at extremely high velocities. By Newton’s laws, gases going out of a rocket engine’s nozzle will exert an equal and opposite force on the rocket itself, thereby pushing the rocket in the other direction.
So, what are the components within a rocket engine that allow for this combustion to happen? To answer this question — we will first talk about what is really getting combusted in a rocket engine. It could be propellants stored in liquid form, gaseous form or a solid form. At least as far as Agnikul goes, we have realized semi-cryogenic liquid propulsion engines (‘Agnilet’ is the name) — so we will stick to liquid propellants, for now.
Injectors: Oxygen and fuel coming into a rocket engine have to efficiently mix to ensure uniform combustion. Then, this mixture has to become a spray of fine droplets, so that the fuel fully burns. This is achieved by what are called injectors. More on this upcoming blogs. These are extremely complex geometries that usually take 100’s of machining processes such as welding, drilling etc. to make precisely.
View attachment 20612
Injector plate: This is where all these injectors are assembled. This is painstaking work, if done manually.
Manifolds: Think of these as distribution channels. Fuel and oxygen have to be given to each of these injectors in a uniform manner. This is difficult stuff because the level of uniformity and precision expected is of the order of 0.1% of the mass coming in.
Combustion Chamber: This is where the actual burning happens.
Nozzle: This is where the gases are accelerated as they leave the engine. The faster the exit speed of the gases, the better the thrust (at least roughly speaking).
Cooling channels: This is where life gets tricky. The burning gases end up making the rocket engine extremely hot. So, need to cool the engine. Someone, very early on figured that the liquid fuel itself can be used to cool the engine — just circulate it around the engine and bring it in. There are 100s of cooling channels in a rocket engine and each one of them has to be carefully crafted.
When you make all of this in one shot and as a single component (as opposed to putting together 1000’s of components through conventional fabrication techniques such as welding, brazing etc.) — we have a single piece rocket engine !
View attachment 20613
Agnilet - Agnikul’s single piece, fully 3d printed, semi-cryogenic engine. Photo date : August 2019
How to realize such an engine? Why do this at all? More will follow in the coming days…
What really is a “single piece” rocket engine & why we make these at Agnikul? (part 2/n)
By Srinath Ravichandran
View attachment 20614
Agnibaan’s 3d printed Agnilet on a thrust stand (Agnibaan is a 2 stage vehicle capable of lifting 100kgs to LEO)
Firstly, a note of thanks: It has been a painful few months for most of us in India. The second Covid wave was brutal. I want to thank the super hardworking Agnikul crew for both their incessant commitment to make hardware work and their efforts to keep each other’s spirits high in these difficult times.
Secondly, a sigh of relief: Liquid Oxygen (LOX) shortage across the country seems to have come under control. Phew. “Deep breath”! At Agnikul, we had paused all activity involving LOX since April 21, 2021 — of course, it just did not feel right to use LOX in those times. It was a difficult decision to make as a startup but definitely was the right thing to do. Now, feels like there are hints of normalcy around.
Thirdly, a tone of childish enthusiasm: It doesn’t get better than this to make anything rocket related. With the dawn of space tourism, landing of rocket boosters, space agencies across the world supporting private missions, and just so much space buzz everywhere — I feel like I am really in the middle of an Arthur C Clarke novel which starts off casually about humans living both on earth, and in the space around it.
Now, back to topic of the blog : Last week, Agnikul’s crew successfully test fired one of our completely regeneratively cooled Agnilets. This was the third such test on the exact same piece of hardware.
For this piece of hardware, the test videos are here: Burn 1, Burn 2, Burn 3.
View attachment 20615
Image on the page left: First successful firing on this hardware. Middle : Thermal qualification burn on this hardware. Right: Repeatability burn
Product strategy: This goes on to prove a lot of things in our strategy checklist as a launch vehicle maker: rocket engines can be just single pieces of hardware — check, 3d printed hardware can be made to work at rocket engine temperatures repeatedly — check, reliable and repeatable test results in every firing is possible with single piece hardware — check, and more…
Automating engine making: One thing that we have come to realize in printing entire rocket engines since September 2019 is that, in essence, this has “automated” the process of engine making for Agnikul. There is zero assembly involved in the creation of an engine.
Zero assembly: There is a huge difference between even having a 2 piece engine (non-zero assembly) vs. having the entire engine as just a single piece of hardware (zero assembly). Having more than 2 pieces or more to put together to make a full engine could imply — involved assembly, tedious human intervention, potential for error prone manufacturing to name a few.
All that said, we are gearing up for more engine firing soon, as we further tune these for flight. I will keep the updates coming!
If you are curious about the first part of this blog, you can find it here.
PS : Since high school, engines of all kinds have appealed to me. Engines, just like electric motors, are human made tools to convert one form of energy to another in order to make things work. To know that such systems can be created make me super excited. It feels like nature is cutting our species some slack to play around a bit. I am now ever so humbled & feel very grateful to be building engines at Agnikul, with our incredible crew.
Agnikul Cosmos has a very simple launch vehicle development strategy. They are developing the Agnibaan launcher which will have 5 configurations. The configurations will depend on engine clustering. The first stage could have 4, 5, 6 or 7 engines. An optional third “baby” stage will be available too.
View attachment 20619
The elegance of their strategy is that the whole thing relies on just 1 engine named "Agnite/Agnilet". Just one engine for the whole launcher. The logistical gain from that alone would be great. Oh and the engine is a single piece 100% 3D-printed. So the engine making process is completely automated & can be sped up exponentially.
Agnite/Agnilet engine specs:
Propellant: LOX/Kerosene semi-cryogenic
Thrust: 25 kN (Sea Level)
Specific Impulse: 285 sec (Sea Level) & 355 sec (Vacuum Optimized)
Engine cycle: Gas generator (probably)
Feed: Pressure fed (for now)/Electric pump fed(soon)
Cooling: Integrated Regenerative cooling
Agnite is the world's 1st 100% 3D printed engine that has been test fired. Here is the engine just after printing:
View attachment 20618
And this is after testing:
View attachment 20620
Notice the discolouration, common feature of engine after a few rounds of firing. Also the threaded part on top right has cracked. The engine has been test fired multiple times at the IIT-Madras test bed:
View attachment 20616
In the initial tests the LOX was being pressure fed to simplify things. Agnikul has started making electric pumps to feed LOX recently. The pumps are >90% 3D printed.
Testing the engines with the new pumps have started. Agnikul is receiving technical support from ISRO & IIT Madras. The Agnite engine has been in development for at least 3 years. It should complete development soon.
View attachment 20617
Given the relatively modest thrust of the Agnite/Agnilet engine & the fact that its semi-cryogenic should mean the engine is highly throttleable. If that's the case then the 1st stage may be recoverable. They have already proven its repeatability in tests, meaning the recovered engines can be fired again. Pretty sure they wont be trying that on the 1st flight, but still an interesting possibility for the future.
Since the entire rocket relies on this engine, if it is ready the rocket will be ready soon after. In fact Agnikul intends to do its 1st commercial launch on 2022. They even plan to 3D print the entire rocket. Would be awesome if they can maintain that deadline even with COVID. Skyroot's Vikram I rocket also intends to have its 1st launch in mid 2022. Will write about Skyroot some other day. ISRO's SSLV will have its 1st launch on late 2021 or early 2022. So optimistically we could get 3 new small satellite launchers by next year. ISRO' NSLV could also have its 1st launch in 2022, though that has not been confirmed.
Anyway hers are 2 blog post from one of Agnikul Cosmos' founders. They are a few months old :
What really is a “single piece” rocket engine & why we make these at Agnikul? (part 1/n)
By Srinath Ravichandran
Let’s start with some basics. What is a rocket engine? In its simplest form, a rocket engine is a device that is capable of burning gases and sending them out at extremely high velocities. By Newton’s laws, gases going out of a rocket engine’s nozzle will exert an equal and opposite force on the rocket itself, thereby pushing the rocket in the other direction.
So, what are the components within a rocket engine that allow for this combustion to happen? To answer this question — we will first talk about what is really getting combusted in a rocket engine. It could be propellants stored in liquid form, gaseous form or a solid form. At least as far as Agnikul goes, we have realized semi-cryogenic liquid propulsion engines (‘Agnilet’ is the name) — so we will stick to liquid propellants, for now.
Injectors: Oxygen and fuel coming into a rocket engine have to efficiently mix to ensure uniform combustion. Then, this mixture has to become a spray of fine droplets, so that the fuel fully burns. This is achieved by what are called injectors. More on this upcoming blogs. These are extremely complex geometries that usually take 100’s of machining processes such as welding, drilling etc. to make precisely.
View attachment 20612
Injector plate: This is where all these injectors are assembled. This is painstaking work, if done manually.
Manifolds: Think of these as distribution channels. Fuel and oxygen have to be given to each of these injectors in a uniform manner. This is difficult stuff because the level of uniformity and precision expected is of the order of 0.1% of the mass coming in.
Combustion Chamber: This is where the actual burning happens.
Nozzle: This is where the gases are accelerated as they leave the engine. The faster the exit speed of the gases, the better the thrust (at least roughly speaking).
Cooling channels: This is where life gets tricky. The burning gases end up making the rocket engine extremely hot. So, need to cool the engine. Someone, very early on figured that the liquid fuel itself can be used to cool the engine — just circulate it around the engine and bring it in. There are 100s of cooling channels in a rocket engine and each one of them has to be carefully crafted.
When you make all of this in one shot and as a single component (as opposed to putting together 1000’s of components through conventional fabrication techniques such as welding, brazing etc.) — we have a single piece rocket engine !
View attachment 20613
Agnilet - Agnikul’s single piece, fully 3d printed, semi-cryogenic engine. Photo date : August 2019
How to realize such an engine? Why do this at all? More will follow in the coming days…
What really is a “single piece” rocket engine & why we make these at Agnikul? (part 2/n)
By Srinath Ravichandran
View attachment 20614
Agnibaan’s 3d printed Agnilet on a thrust stand (Agnibaan is a 2 stage vehicle capable of lifting 100kgs to LEO)
Firstly, a note of thanks: It has been a painful few months for most of us in India. The second Covid wave was brutal. I want to thank the super hardworking Agnikul crew for both their incessant commitment to make hardware work and their efforts to keep each other’s spirits high in these difficult times.
Secondly, a sigh of relief: Liquid Oxygen (LOX) shortage across the country seems to have come under control. Phew. “Deep breath”! At Agnikul, we had paused all activity involving LOX since April 21, 2021 — of course, it just did not feel right to use LOX in those times. It was a difficult decision to make as a startup but definitely was the right thing to do. Now, feels like there are hints of normalcy around.
Thirdly, a tone of childish enthusiasm: It doesn’t get better than this to make anything rocket related. With the dawn of space tourism, landing of rocket boosters, space agencies across the world supporting private missions, and just so much space buzz everywhere — I feel like I am really in the middle of an Arthur C Clarke novel which starts off casually about humans living both on earth, and in the space around it.
Now, back to topic of the blog : Last week, Agnikul’s crew successfully test fired one of our completely regeneratively cooled Agnilets. This was the third such test on the exact same piece of hardware.
For this piece of hardware, the test videos are here: Burn 1, Burn 2, Burn 3.
View attachment 20615
Image on the page left: First successful firing on this hardware. Middle : Thermal qualification burn on this hardware. Right: Repeatability burn
Product strategy: This goes on to prove a lot of things in our strategy checklist as a launch vehicle maker: rocket engines can be just single pieces of hardware — check, 3d printed hardware can be made to work at rocket engine temperatures repeatedly — check, reliable and repeatable test results in every firing is possible with single piece hardware — check, and more…
Automating engine making: One thing that we have come to realize in printing entire rocket engines since September 2019 is that, in essence, this has “automated” the process of engine making for Agnikul. There is zero assembly involved in the creation of an engine.
Zero assembly: There is a huge difference between even having a 2 piece engine (non-zero assembly) vs. having the entire engine as just a single piece of hardware (zero assembly). Having more than 2 pieces or more to put together to make a full engine could imply — involved assembly, tedious human intervention, potential for error prone manufacturing to name a few.
All that said, we are gearing up for more engine firing soon, as we further tune these for flight. I will keep the updates coming!
If you are curious about the first part of this blog, you can find it here.
PS : Since high school, engines of all kinds have appealed to me. Engines, just like electric motors, are human made tools to convert one form of energy to another in order to make things work. To know that such systems can be created make me super excited. It feels like nature is cutting our species some slack to play around a bit. I am now ever so humbled & feel very grateful to be building engines at Agnikul, with our incredible crew.
Indian industry to produce two more entire rockets
The government plans to realise entirely-built rockets -- GSLV-Mk III and SSLV -- from Indian industry partners, in addition to PSLV.
Press Trust of India, Bengaluru
September 19, 2021
UPDATED: September 19, 2021 15:13 IST
View attachment 21060
NSIL has received three bids -- HAL-L&T, BEL-Adani-BEML, and BHEL, in response to the request for proposal (RFP) floated by it for end-to-end production of PSLV.
The Department of Space (DoS) plans to realise entirely-built rockets -- GSLV-Mk III and SSLV -- from Indian industry partners, in addition to PSLV, according to a top official of its commercial arm NSIL.
NSIL (NewSpace India Limited) has received three bids -- HAL-L&T, BEL-Adani-BEML, and BHEL, in response to the request for proposal (RFP) floated by it for end-to-end production of PSLV (Polar Satellite Launch Vehicle).
"We are now going through the techno-commercial evaluation (in respect of the three bids)", NSIL Chairman and Managing Director, Radhakrishnan D, told PTI in Bengaluru.
He said the process will be completed within the next two months with one of the bidders bagging the contract. The selected bidder will be responsible for realisation of five numbers of PSLV.
Immediately after selection of the bidder to produce the entire PSLV, NSIL will release Expression of Interest (EOI) for end-to-end production of another operational rocket -- GSLV-Mk III (Geosynchronous Satellite Launch Vehicle) -- in a similar fashion, Radhakrishnan said.
"I am targeting before the end of this year (to release EOI for GSLV-Mk III)", he said.
NSIL also has plans to realise SSLV (Small Satellite Launch Vehicle), being developed by the Indian Space Research Organisation (ISRO) with the first development flight expected by this year-end, through Indian industry partners.
"We are waiting for the first mission (of SSLV) to happen successfully", Radhakrishnan said. "This (SSLV) will be an ideal candidate for industry production".
SSLV is a three-stage all solid vehicle and has a capability to launch up to 500 kg satellite mass into 500 km low earth orbit (LEO) and 300 kg to Sun Synchronous Orbit (SSO).
The new generation compact rocket has been designed to meet "launch on demand" requirements in a cost-effective manner for small satellites in a dedicated and rideshare mode, according to officials of Bengaluru-headquartered ISRO.
Industrialisation of space activities is gaining momentum in India.
About 40 space startups and industries are in consultation with ISRO for support related to various domains of space activity such as development of satellites, launch vehicles, develop applications and provide space-based services.
India's Foreign Direct Investment policy in the space sector is also getting revised which, the ISRO Chairman and DoS Secretary K Sivan believe, will open up huge avenues for foreign companies to invest in the country.
Earlier this month, the DoS entered into a Framework MoU with two spacetech startups -- Skyroot Aerospace and Agnikul Cosmos -- for access to ISRO facilities and expertise towards the development and testing of subsystems/systems of space launch vehicles.
Indian industry to produce two more entire rockets
The Indian Space Research Organisation (ISRO) has, for the first time, got inquiries for launching commercial satellites on its most powerful launch vehicle — the GSLV-MK3.
According to multiple sources in the Department of Space (DoS), the first launch may happen as early as the beginning of next year and the “announcement about the same is expected very soon”.
“...There are inquiries, and the DoS is in advanced stages of discussions with one major player for commercial launches. At this juncture, we cannot name the company/companies. But I can say this is a major project,” a source said.