Author Topic: SSLV set to launch by 2019  (Read 19706 times)

Offline K210

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SSLV set to launch by 2019
« on: 11/22/2017 08:11 am »
ISRO has quietly been working on PSLV-3S SSLV over the past few years and revealed recently that it will be ready for launch by 2019. It will be able to carry 500kg - 700kg to LEO and will cost 1/10th the amount of a normal PSLV. Assembly time will be 3 days compared to 30 days for normal PSLV. Total vehicle mass will be 100 tons.

Source: https://timesofindia.indiatimes.com/india/isros-plan-a-rocket-that-can-be-made-in-3-days/articleshow/61746668.cms
« Last Edit: 01/02/2018 03:30 pm by gongora »

Online Galactic Penguin SST

Re: PSLV 3S set to launch by 2019
« Reply #1 on: 11/22/2017 08:29 am »
Are you sure that this is the PSLV-3S (core alone variant minus second stage, if I understand correctly)? The CA variant is around 230 t in mass and the second stage is only around 40 t, very far from the 100 t figure quoted.

I also doubt that any rocket with multiple segments solid stages can be prepared in 3 days and somehow shaves 90% of cost magically. ::)
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Offline K210

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Re: PSLV 3S set to launch by 2019
« Reply #2 on: 11/22/2017 08:46 am »
Are you sure that this is the PSLV-3S (core alone variant minus second stage, if I understand correctly)? The CA variant is around 230 t in mass and the second stage is only around 40 t, very far from the 100 t figure quoted.

I also doubt that any rocket with multiple segments solid stages can be prepared in 3 days and somehow shaves 90% of cost magically. ::)

The 3S config has probably been updated to use a single segment composite solid fuel motor for the first stage. I suspect they have gone the vega route of using all solids for stage 1 and 2 and using PS4 from pslv for 3rd stage. 

Just like any launch vehicle we wont know the true cost until it flys.

Offline Skyrocket

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Re: PSLV 3S set to launch by 2019
« Reply #3 on: 11/22/2017 10:21 am »
Are you sure that this is the PSLV-3S (core alone variant minus second stage, if I understand correctly)? The CA variant is around 230 t in mass and the second stage is only around 40 t, very far from the 100 t figure quoted.

I also doubt that any rocket with multiple segments solid stages can be prepared in 3 days and somehow shaves 90% of cost magically. ::)

I agree - this one is likely not the PSLV-3S. It must be a new development (especially stage 1), with perhaps some heritage on the PSLV

Offline K210

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Re: PSLV 3S set to launch by 2019
« Reply #4 on: 11/23/2017 06:57 am »
Given the short development time it is possible this might be a modified version of india's agni-v ICBM. It has been hinted in the past that agni-v could one day be used to provide a rapid launch capacity maybe this is it?

Offline sanman

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Re: PSLV 3S set to launch by 2019
« Reply #5 on: 11/23/2017 09:12 am »
The Agni-V ICBM is supposed to weigh 50 tonnes, whereas the launch vehicle they're talking about is supposed to weigh 100 tonnes. It doesn't sound like they're the same thing. Although you'd think anything that has to be quickly assembled for launch in 3 days would likely be comprised of all solid-fuel elements.
« Last Edit: 11/24/2017 02:19 am by sanman »

Offline chota

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Re: PSLV 3S set to launch by 2019
« Reply #6 on: 12/11/2017 04:52 pm »
Quote
Preliminary work to design and develop an ambitious small launch vehicle began about three months ago

Quote
And the launcher should be able to put satellites of up to 500-600 kg in orbits close to the Earth

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VSSC has designed the vehicle using the rocket technology that it already has and is awaiting ISRO’s approval

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We are looking at having a demonstration launch in a year, in the 2018-19 time frame,

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The development cost would be kept low at a few crore as the new launcher’s requirement of advanced electronics is considerably lower

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A small launcher that can be got up perhaps in three days by a small team

http://www.thehindu.com/sci-tech/science/isro-developing-a-compact-launcher-for-small-satellites/article21420644.ece
« Last Edit: 12/11/2017 04:55 pm by chota »

Offline chota

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Re: PSLV 3S set to launch by 2019
« Reply #7 on: 12/14/2017 08:48 am »
Quote
According to Sivan, the preliminary design for the proposed four-stage rocket that would weigh around 100 tonnes is ready and its feasibility study has also been conducted

Quote
Sivan said the first rocket would be ready in two years once the project gets the necessary approvals.

http://www.thenewsminute.com/article/isro-developing-small-rocket-cash-small-satellite-boom-73143
« Last Edit: 12/14/2017 08:49 am by chota »

Offline worldtimedate

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Re: PSLV 3S set to launch by 2019
« Reply #8 on: 01/02/2018 05:39 am »
ISRO's baby rocket to carry small satellites, likely to take off in 2019

Quote
The first of Indian Space Research Organisation's (ISRO) 'baby rockets' in the making is likely to take to the skies in the first half of 2019, top officials of ISRO's Vikram Sarabhai Space Centre (VSSC) said. Though a formal approval for the Small Satellite Launch Vehicle (SSLV) project is still awaited, VSSC here at Thumba - ISRO's nodal agency for launch vehicles - has already started work on it, VSSC director K Sivan said.

Quote
On the launchpad, the SSLV will stand half as tall as a regular Polar Satellite Launch Vehicle (PSLV) and weigh in the neighbourhood of 100 tonnes, Sivan said. "A PSLV weighs over 300 tonnes. The SSLV's weight would be around 100 tonnes and its height, 20-25 metres," he said. The PSLV, often dubbed the reliable workhorse of the ISRO, stands 44 metres tall in comparison.

Quote
The SSLV will place small satellites in the Low Earth Orbit "orbits with altitudes up to 2,000 km. "We hope to have the first flight of the SSLV in the first half of 2019. Across the globe, satellites are 'shrinking'. Now, small satellites go aboard the PSLV or GSLV as 'piggyback' payloads alongside bigger ones," Sivan said.

The mission cost will be roughly one-tenth that of a PSLV mission. ISRO is planning to have the SSLV flying fully on solid fuel, but the technicalities have to be worked out, Sivan said. If things go as planned, the SSLV will be ISRO's smallest launch vehicle.

--- [ --- ]

Offline K210

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Re: PSLV 3S set to launch by 2019
« Reply #9 on: 01/02/2018 08:52 am »
If the all solid fuel claim is true then this will be isro's first all solid slv since ASLV. In the 90's the goal was to go from solid fuel to liquid fuel. Now decades later they are returning to all-solid launch vehicles. The four stage design reminds me of the old SLV rocket they used to fly in the late 70s/early 80s.....

Offline Skyrocket

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Re: PSLV 3S set to launch by 2019
« Reply #10 on: 01/02/2018 10:11 am »
Perhaps the title of the thread should be changed to "SSLV set to launch by 2019"

Offline Steven Pietrobon

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Re: SSLV set to launch by 2019
« Reply #11 on: 01/03/2018 05:58 am »
Perhaps the title of the thread should be changed to "SSLV set to launch by 2019"

The article says first half of 2019. So, are there any Indian ICBMs that are about 100 t? The Agni III and Agni V are only 50 t. Agni VI is 55 to 70 t and is still is in development.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline vineethgk

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Re: SSLV set to launch by 2019
« Reply #12 on: 01/06/2018 12:19 pm »
Perhaps the title of the thread should be changed to "SSLV set to launch by 2019"

The article says first half of 2019. So, are there any Indian ICBMs that are about 100 t? The Agni III and Agni V are only 50 t. Agni VI is 55 to 70 t and is still is in development.
The first stage is likely all-new maybe ~70 tonnes or so. They could perhaps use motors from Agni-V for the second stage, but its unlikely as the two projects are under different agencies. There is also a question whether using stages from an in-service ballistic missile for a civilian launch vehicle is acceptable from the perspective of national security. (It has happened the other way round in the past though, with SLV-3's first stage essentially ending up as Agni-TD/Agni-1)

I would take that 2019 target with a pinch of salt. ISRO might be habitually quoting a rather optimistic schedule as usual. Perhaps 2020 or later is more likely.

The claim of one-tenth cost could be a bit exaggerated too, in my view. Perhaps that's what they are ultimately targeting for via mass production involving private firms.
« Last Edit: 01/06/2018 12:27 pm by vineethgk »

Offline vineethgk

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Re: SSLV set to launch by 2019
« Reply #13 on: 02/05/2018 01:25 am »
SSLV operations to be entrusted to the private industry after development flights
Quote
"Beyond  these, we are developing a new launch vehicle to put small satellites to space.

We want to hand over its technology and production to industry right from the beginning after doing one or two technology demonstration flights. We will do this through [ISRO's business entity] Antrix Corporation."

Offline sanman

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Re: SSLV set to launch by 2019
« Reply #14 on: 02/13/2018 09:01 am »
...will be ready for launch by 2019. It will be able to carry 500kg - 700kg to LEO and will cost 1/10th the amount of a normal PSLV...

So what kind of launch price is that likely to translate into?
~$2million maybe?

Gee, a Tata Nano only weighs ~600kg  ;)
If corporate sponsors could pay to cover the car with their logos, that might be enough to cover the costs.

But I wonder what the fairing width would be?

Online Galactic Penguin SST

Re: SSLV set to launch by 2019
« Reply #15 on: 02/16/2018 10:27 am »
Looks like we have the first info of the composition of this new launcher:

https://twitter.com/orfonline/status/964400636279205888

Can someone who is well versed with Indian missiles and rockets comment if existing solid rocket motors may have been used here?
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Online Kryten

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Re: SSLV set to launch by 2019
« Reply #16 on: 02/16/2018 10:43 am »
Can someone who is well versed with Indian missiles and rockets comment if existing solid rocket motors may have been used here?
2m diameter matches the Agni-3/5 series; but none of the motor lengths match, as far as I can tell.

Offline Kosmos2001

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Re: SSLV set to launch by 2019
« Reply #17 on: 02/16/2018 11:56 am »
That's a large "1st stage" vs "rest of the stages" ratio. If the number after the letter S means the mass.

Offline vineethgk

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Re: SSLV set to launch by 2019
« Reply #18 on: 02/16/2018 12:29 pm »
Can someone who is well versed with Indian missiles and rockets comment if existing solid rocket motors may have been used here?
2m diameter matches the Agni-3/5 series; but none of the motor lengths match, as far as I can tell.
The S7 mentioned as second stage appear to match PS3 of the PSLV where the motor itself has 2m dia.
« Last Edit: 02/16/2018 12:31 pm by vineethgk »

Offline K210

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Re: SSLV set to launch by 2019
« Reply #19 on: 02/16/2018 12:30 pm »
Looks like we have the first info of the composition of this new launcher:

https://twitter.com/orfonline/status/964400636279205888

Can someone who is well versed with Indian missiles and rockets comment if existing solid rocket motors may have been used here?

The S85 looks like it is composed of various motor segments from the S139 which forms the first stage of PSLV and GSLV MK-2. The S-7 is the third stage of PSLV. S-4 seems to be a new motor. The optional fourth stage is the PS4 from PSLV.

It looks like a very cost effective launch vehicle. I would put the cost at less then $5 million per launch. 

Offline Skyrocket

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Re: SSLV set to launch by 2019
« Reply #20 on: 02/16/2018 12:45 pm »
Looks like we have the first info of the composition of this new launcher:

https://twitter.com/orfonline/status/964400636279205888

Can someone who is well versed with Indian missiles and rockets comment if existing solid rocket motors may have been used here?

The S85 looks like it is composed of various motor segments from the S139 which forms the first stage of PSLV and GSLV MK-2. The S-7 is the third stage of PSLV. S-4 seems to be a new motor. The optional fourth stage is the PS4 from PSLV.

It looks like a very cost effective launch vehicle. I would put the cost at less then $5 million per launch. 

No, the S85 has a different diameter than the the S139. The optional fourth stage is likely not the PS-4 from PSLV, which would be somewhat oversized.

Offline K210

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Re: SSLV set to launch by 2019
« Reply #21 on: 02/16/2018 12:53 pm »
Looks like we have the first info of the composition of this new launcher:

https://twitter.com/orfonline/status/964400636279205888

Can someone who is well versed with Indian missiles and rockets comment if existing solid rocket motors may have been used here?

The S85 looks like it is composed of various motor segments from the S139 which forms the first stage of PSLV and GSLV MK-2. The S-7 is the third stage of PSLV. S-4 seems to be a new motor. The optional fourth stage is the PS4 from PSLV.

It looks like a very cost effective launch vehicle. I would put the cost at less then $5 million per launch. 

No, the S85 has a different diameter than the the S139. The optional fourth stage is likely not the PS-4 from PSLV, which would be somewhat oversized.

The PS4 has a diameter of 1.34m making it a perfect fit. Apart from PS4 isro has no other hypergolic upper stages. The only other possibility is they develop a new upper stage but that would still have to be based on PS4 technology unless they decide to use cryo which would not make a lot of sense in a small launcher.

As for the S-85 it could very well be a brand new motor. However how they will develop and test it in just 1 year i dont know.
« Last Edit: 02/16/2018 12:56 pm by K210 »

Online Galactic Penguin SST

Re: SSLV set to launch by 2019
« Reply #22 on: 02/16/2018 01:34 pm »
Looks like we have the first info of the composition of this new launcher:

https://twitter.com/orfonline/status/964400636279205888

Can someone who is well versed with Indian missiles and rockets comment if existing solid rocket motors may have been used here?

The S85 looks like it is composed of various motor segments from the S139 which forms the first stage of PSLV and GSLV MK-2. The S-7 is the third stage of PSLV. S-4 seems to be a new motor. The optional fourth stage is the PS4 from PSLV.

It looks like a very cost effective launch vehicle. I would put the cost at less then $5 million per launch.

That would be a world record even given the cost in India - but I have great doubts due to the big segmented
first stage. This one is bigger than similar rockets in the US, Europe and Japan and their costs are in the $35 - 50 million range, and they use single body rocket motors.

They will be pretty good if they can fly it at less than $20 million price (though ISRO won't be out of customers even at higher costs).
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Offline K210

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Re: SSLV set to launch by 2019
« Reply #23 on: 02/16/2018 03:23 pm »
Looks like we have the first info of the composition of this new launcher:

https://twitter.com/orfonline/status/964400636279205888

Can someone who is well versed with Indian missiles and rockets comment if existing solid rocket motors may have been used here?

The S85 looks like it is composed of various motor segments from the S139 which forms the first stage of PSLV and GSLV MK-2. The S-7 is the third stage of PSLV. S-4 seems to be a new motor. The optional fourth stage is the PS4 from PSLV.

It looks like a very cost effective launch vehicle. I would put the cost at less then $5 million per launch.

That would be a world record even given the cost in India - but I have great doubts due to the big segmented
first stage. This one is bigger than similar rockets in the US, Europe and Japan and their costs are in the $35 - 50 million range, and they use single body rocket motors.

They will be pretty good if they can fly it at less than $20 million price (though ISRO won't be out of customers even at higher costs).

It costs about $22 million for a PSLV-XL so this new SSLV will probably be in the 5-10 million range. If this does become operational then the PSLV-CA will probably be retired.

Offline TrevorMonty

Re: SSLV set to launch by 2019
« Reply #24 on: 02/16/2018 08:14 pm »
Needs to be in $5-10m range as it will be competing directly with LauncherOne and Electron for smaller payloads.


Offline Skyrocket

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Re: SSLV set to launch by 2019
« Reply #25 on: 02/17/2018 01:03 pm »
with 500 kg payload to LEO and 116 t lift off mass, SSLV has a pretty poor payload ratio compared to other solid fuel rockets.

For comparison:
Vega has a launch mass of 137 t and can orbit 1430 kg to LEO.
Taurus/Minotaur-C has a launch mass of 73 t and can orbit 1320 kg to LEO.

Offline hop

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Re: SSLV set to launch by 2019
« Reply #26 on: 02/18/2018 02:49 am »
The PS4 has a diameter of 1.34m making it a perfect fit. Apart from PS4 isro has no other hypergolic upper stages.
"bi-propellant RCS / Velocity trimming" sounds like something that could be derived from a spacecraft propulsion system. Think a bi-prop version of the HAPS stage Orbital offers for Pegasus, based on the LAM from ISRO satellite buses. (edit: This is purely speculation on my part, based on the description and the fact that a small liquid trim stage is often desirable on all-solid vehicles)
« Last Edit: 02/18/2018 02:50 am by hop »

Offline Steven Pietrobon

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Re: SSLV set to launch by 2019
« Reply #27 on: 02/18/2018 03:17 am »
with 500 kg payload to LEO and 116 t lift off mass, SSLV has a pretty poor payload ratio compared to other solid fuel rockets.

That might be because for polar orbits, SSLV has to do a dog-leg to avoid Sri Lanka.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline vineethgk

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Re: SSLV set to launch by 2019
« Reply #28 on: 02/18/2018 07:19 am »
with 500 kg payload to LEO and 116 t lift off mass, SSLV has a pretty poor payload ratio compared to other solid fuel rockets.

That might be because for polar orbits, SSLV has to do a dog-leg to avoid Sri Lanka.
The reported performance and mass of SSLV looks more comparable to Epsilon, but falls short of that as well by a bit. I would guess the dog-leg is perhaps the primary culprit in that. By comparison, PSLV reportedly has payload shortfall of over 500kg owing to this.

Offline vineethgk

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Re: SSLV set to launch by 2019
« Reply #29 on: 02/18/2018 03:18 pm »
It is my impression that ISRO's rocket designs have been compromises of sorts based on certain resource and technology constraints they operated under. For instance, GSLV was envisaged as a short-cut to a 2-tonne GTO launcher largely based on available PSLV technologies - especially that awkward design feature of liquid strapons that burn longer than the solid core. That the GSLV took too long to become really operational due to various reasons is another story. GSLV-III too seems to have similar constraints owing to its relatively weak core stage.

In case of SSLV, they may have made compromises to make the LV operational in the shortest possible time by making maximum use of existing infrastructure, even if it meant an inefficient design in terms of payload-mass fraction. They do not have much time to invest in new facilities if they intend to have it ready for flight testing by end of next year (which I doubt they would, 2020 or even 2021 looks a more probable date to me). While the S85 and S4 stages appear all new, the S7 second stage is likely sourced from PS3 of PSLV. The velocity trim stage (fourth stage) *could* be based on a single engined PS4 (a lighter PAM-G), or perhaps it is an all-new light upper stage.

Though I'm not sure how feasible this is in technical terms it is, a possibility that occured to my mind is whether they can attach two S9/S12 strapons to the LV as an option to achieve higher payloads. That would jack up the costs a bit, but a mass production of S12 strapons could perhaps lower its cost in the long-term.
« Last Edit: 02/18/2018 03:21 pm by vineethgk »

Offline Kosmos2001

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Re: SSLV set to launch by 2019
« Reply #30 on: 02/20/2018 06:21 am »
For comparison:
Vega has a launch mass of 137 t and can orbit 1430 kg to LEO.
Taurus/Minotaur-C has a launch mass of 73 t and can orbit 1320 kg to LEO.

How is it possible considering Vega has a propellant/total mass ratio of 0.898 (vs 0.893 Taurus-XL), 340.5 MN·s of impulse (vs 189.6 MN·s Taurus-XL) and is launched from a ~5.23º inclination (vs ~34.71º Taurus-XL)?
« Last Edit: 02/20/2018 06:22 am by Kosmos2001 »

Offline sanman

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Re: SSLV set to launch by 2019
« Reply #31 on: 03/30/2018 10:17 am »
Somebody posted this up on Reddit:

http://www.spaceworkscommercial.com/wp-content/uploads/2018/02/Nano-Microsatellite-Market-Forecast-8th-Edition-2018.pdf




Not sure what they're basing any ranking on. What's IOC mean - "entry into service date"?
« Last Edit: 03/30/2018 01:34 pm by sanman »

Offline vyoma

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Re: SSLV set to launch by 2019
« Reply #32 on: 05/14/2018 09:17 pm »
https://m.timesofindia.com/india/isro-to-rope-in-industry-majors-for-mini-pslv-project/articleshow/64034805.cms

Quote
May 4, 2018, 23:06 IST TNN[ Surendra Singh ]

NEW DELHI: Indian Space Research Organisation (Isro) will rope in private companies or consortiums for its mini-PSLV project aimed at tapping the small satellite launch market. Isro chairman K Sivan told TOI that the first such rocket is likely to be tested by the middle of next year.

The project – first reported by TOI – involves assembling a small rocket in three days, at a lower cost. It takes 30 to 40 days to put together a normal PSLV, which is 44m tall and 2.8m in diameter. Dr Sivan said, "Isro will initially build one or two mini rockets. Thereafter, private companies will be given the contract to build them. Antrix (Isro’s commercial arm) is working on the business model.” The consortium of companies that will be given the task to build the mini rocket may include industry majors like Larsen & Toubro (L&T) and Godrej Aerospace.

Quote
A PSLV costs around Rs150 crore, while a mini-PSLV can be made with one-tenth the money. The rocket will weight one-third that of a normal PSLV which weights 300 tonnes. The mini version will have a payload capacity of less than 700 kg, compared to a normal PSLV’s capacity to carry more than 1,750kg to a sun-synchronous polar orbit of 600km altitude.

Offline worldtimedate

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Re: SSLV set to launch by 2019
« Reply #33 on: 05/31/2018 07:51 am »
ISRO's big scheme to send small rockets into space

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India's space agency aims to create a consortium of companies to build and market a small rocket to launch low-weight satellites at lesser cost and within shorter durations, as it seeks to tap into burgeoning global demand for such services.

Led by Antrix Corp - the commercial arm of the Indian Space Research Organisation - the consortium will include engineering major Larsen & Toubro, Godrej Aerospace and Hindustan Aeronautics Ltd. The combine will help Isro build a small rocket capable of carrying 500 kilogram satellites into the lower earth orbit.

Quote
"Our aim is that one or two rockets will be launched by Isro, the industry should then make the rockets and launch satellites," said K Sivan, chairman of Isro in an interview with ET. He said Isro has approached these companies and that "they are all interested".

"The price of a satellite launch on this small rocket is expected to be less than one-fifth of the current launch costs," Sivan added. The first development flight or launch of the rocket will be by 2019.

Quote
Typically, Isro takes around 45 days to assemble its workhorse the Polar Satellite Launch Vehicle (PSLV). The smaller rocket, to be powered by a solid booster, is expected to be ready for launch in three days.

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Offline chota

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Re: SSLV set to launch by 2019
« Reply #34 on: 07/04/2018 06:40 pm »
One more

Offline PonRam

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Re: SSLV set to launch by 2019
« Reply #35 on: 08/03/2018 05:15 am »
S85 does seem a bit too big of a core to launch 500kgs to LEO. Simple delta-v calc would show a core 25ton block (S25) with S7 and S4 would be able to launch 500kgs to LEO considering delta-v losses of around 10% for drag and gravity which is the norm for a PSLV like vehicle. On top if you consider the dog-leg then they may need may be a S35 block. S85 seems an over-kill.

Offline K210

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Re: SSLV set to launch by 2019
« Reply #36 on: 08/05/2018 01:27 am »
S85 does seem a bit too big of a core to launch 500kgs to LEO. Simple delta-v calc would show a core 25ton block (S25) with S7 and S4 would be able to launch 500kgs to LEO considering delta-v losses of around 10% for drag and gravity which is the norm for a PSLV like vehicle. On top if you consider the dog-leg then they may need may be a S35 block. S85 seems an over-kill.

I don't know the specifics but isro's solid motors do not use composite motor cases. This results in a worse thrust to weight ratio which results in the need for larger motors. Also the ISP for isro's solid motors are generally on the lower end which could also be a contributing factor towards the need for such a large first stage.

Offline calapine

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Re: SSLV set to launch by 2019
« Reply #37 on: 08/05/2018 05:25 am »
Not sure what they're basing any ranking on. What's IOC mean - "entry into service date"?

Initial Operational Capability

Offline PonRam

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Re: SSLV set to launch by 2019
« Reply #38 on: 08/06/2018 03:02 am »
S85 does seem a bit too big of a core to launch 500kgs to LEO. Simple delta-v calc would show a core 25ton block (S25) with S7 and S4 would be able to launch 500kgs to LEO considering delta-v losses of around 10% for drag and gravity which is the norm for a PSLV like vehicle. On top if you consider the dog-leg then they may need may be a S35 block. S85 seems an over-kill.

I don't know the specifics but isro's solid motors do not use composite motor cases. This results in a worse thrust to weight ratio which results in the need for larger motors. Also the ISP for isro's solid motors are generally on the lower end which could also be a contributing factor towards the need for such a large first stage.

My statement above is based on extrapolating from existing PSLV stages (thus taking into consideration the factors you have mentioned).

Offline worldtimedate

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Re: SSLV set to launch by 2019
« Reply #39 on: 08/12/2018 09:00 pm »
ISRO wants to launch two demonstration flights of SSLV in May and October, 2019

Quote
The SSLV ( small satellite launch vehicle ) is being developed at a furious pace at ISRO's Vikram Sarabhai Space Centre. The SSLV will be an on-demand rocket for small satellites weighing about 500-700 kg. It will be autonomous and highly intelligent, versatile and capable of adapting to different launch situations and requirements.

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Its first test launch is planned for mid-2019. Once proven, the SSLV's production would be offered to industry through Antrix Corporation, according to ISRO Chairman K. Sivan.

The SSLV is said to be Dr. Sivan's dream concept for a quick-response space vehicle, and the project was initiated when he was the Director of the VSSC until January this year.

Source : Small launcher will have a big impact

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Among the key missions to look for in 2019 will be the Chandrayaan-2, Aditya-L1 (India's solar mission) and two demonstration flights of the SSLV (small satellite launch vehicle).

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Aside of this, the agency also plans to have two demonstration flights of the SSLV in May and October after which it can go into production phase. "These launch vehicles will cost one tenth of a PSLV and compared to about 45 days needed to prepare a launch vehicle for launch, this will need only 72 hours. Also, it needs only three to four people as opposed to 300. But it can only launch payloads with a mass of 500-700 kg and we hope that the industry can soon start making these," Sivan said.

Source : Isro aims to launch 22 missions in 2019; 50 in 3 years

--- [ --- ]

Offline K210

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Re: SSLV set to launch by 2019
« Reply #40 on: 08/30/2018 05:37 am »
Quote
Rakesh Sasibhushan, CMD Antrix said: “Antrix is looking at 50/60 launches SSLVs a year and in the next 10 years, we see a business potential of ₹1500-2000 crore annually.”


ISRO is developing SSLV with the intention of 50-60 launches per year by late 2020s. If it happens it would mean a SSLV launch every week!

Source: https://www.thehindubusinessline.com/news/isro-antrix-to-involve-private-sector-in-sslv-biz/article24812998.ece

Offline sanman

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Re: SSLV set to launch by 2019
« Reply #41 on: 08/30/2018 05:44 pm »
ISRO is looking to outsource manufacturing of PSLV & SSLV in order to focus on the human spaceflight program:

https://gadgets.ndtv.com/science/news/isro-keen-to-outsource-pslv-sslv-manufacturing-to-concentrate-on-human-spaceflight-1908763

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The Indian Space Research Organisation (ISRO) and its commercial wing Antrix on Wednesday said they are willing to outsource manufacturing of Polar Satellite Launch Vehicle (PSLV) and the Small Satellite Launch Vehicle (SSLV) so that the space agency could focus on the proposed human space programme. ISRO held discussions a week ago with a consortium of industries regarding PSLV industrialisation with the objective of easing ISRO to focus on human space programme and research and development activities.

"Definitely, in my opinion, in the ISRO activity, industry is going to play a major role. If only the industry is taking the load, ISRO can work out on human space programme and research and development activities," ISRO chairman K Sivan said.

He said the industry should help in manufacturing PSLV as well as SSLV, adding ISRO had already worked out a model. With this model in a year, the PSLV was supposed to be produced by the industry. "That is our ambition and target," Sivan said.

He was addressing a press conference here to announce the Bengaluru Space Expo (BSX), a three-day event starting from September 6 at the Bengaluru International Exhibition Centre(BIEC).

BSX-2018 will have 100 exhibitors, 56 speakers, and 600 official delegates participating. There will be a separate pavilion for human space programme or Gaganyaan, which was announced by Prime Minister Narendra Modi in his Independence Day address this year.

PM Modi had said an Indian astronaut would be sent to space by 2022. India will be the fourth country after the USA, Russia, and China to send humans to space. Sivan said informal discussions had been initiated with the Indian Air Force on selection of the crew. Once selected, it would take two-three years to train them.

He also said ISRO would need to take the help of a foreign country for advanced training of the crew. "We have not decided which country we will choose for training. Russia, Germany, and USA have the facilities," Sivan added.

On the PSLV outsourcing, the ISRO chief said industry partners Hindustan Aeronautics Limited (HAL), Larsen and Tubro, Godrej were among those who took part in the discussions. "It is possible to produce PSLV from this consortium. Already we have started working on that," Sivan said.

Sivan said the industry would have a huge role to play in Gaganyaan and in building facilities for mission control centre and launch pad. Antrix Managing Director Rakesh Sasibhushan said the small satellite service was an $18 billion market (roughly Rs. 1.27 lakh crores) and they were looking at 50-60 launch vehicles per year.

"We are looking for a 50-60 vehicles per year, which is definitely going to make it commercially viable to produce...So the general capacity we are building, we are looking at a revenue of around Rs. 1,500 crores to Rs. 2,000 crores per year," he said. Atrix was discussing with various industry players in this connection, he added.

Re: SSLV set to launch by 2019
« Reply #42 on: 08/31/2018 12:57 pm »
An interview of ISRO head stated that 85% of the cost is other cost and only 15% is for parts and fuel. So, 85% will go for labour and quality inspection. The reduction in labout to 10% of normal will reduce overall 75% of the cost directly. The reduction in weight and number of parts and fuel will reduce 10% of cost. So, I would not be surprised if the launch cost actually is 15% of normal launch cost


The cost of PSLV C28 rented to UK cost 28 million Euros. This would have been lower if it was for Indian launch. ISRO charges higher for foreign launches. So, even going by the figure of PSLV C28 for UK, the launch cost should come to 15% of 28 million Euros which is roughly equal to $4million USD. The Indian cost for launch is likely to be $3million whereas foreign launch is likely to be $5million. There may be premium added to get more profits. But the cut throat pricing will only come to this.

The labour cost will also involve cost to fund the development programmes, salary etc and hence it is unlikely to be reduced to 10% unless the scale goes up drastically. Even then, the cost is likely to be in $7-8 million. The cost of electron rocket launch is $5million for 150 kg and will still be 3 times less competitive than SSLV

Offline chota

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Re: SSLV set to launch by 2019
« Reply #43 on: 09/06/2018 02:24 pm »
Model of SSLV @ https://twitter.com/SpaceExpoIndia

PhotoCredit and copyrights https://www.reddit.com/user/pgoi


Offline K210

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Re: SSLV set to launch by 2019
« Reply #44 on: 09/06/2018 02:50 pm »
The new design looks like a modernised version of 1980s SLV

Offline tijojose

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Re: SSLV set to launch by 2019
« Reply #45 on: 09/16/2018 02:50 am »
SSLV Infographics from Bangalore Space Expo 18
Credit:  pgoi (on redditt) https://www.reddit.com/r/ISRO/comments/9d7p5r/bangalore_space_expo_18/
Gallery: https://imgur.com/gallery/gBwuE37

Offline advaidhya

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Re: SSLV set to launch by 2019
« Reply #46 on: 09/20/2018 11:52 am »
Why does SSLV weigh 120tons? When other countries like USA has ICBM minuteman which can reach 1200km at 50 ton, why India can't make a similar ICBM type missile which can launch satellite to 500-600km orbit for 50-60tons?

Offline Steven Pietrobon

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Re: SSLV set to launch by 2019
« Reply #47 on: 09/20/2018 12:27 pm »
Why does SSLV weigh 120tons? When other countries like USA has ICBM minuteman which can reach 1200km at 50 ton, why India can't make a similar ICBM type missile which can launch satellite to 500-600km orbit for 50-60tons?

One reason is the big dog-leg SSLV performs to avoid overflying Sri Lanka.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline vineethgk

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Re: SSLV set to launch by 2019
« Reply #48 on: 09/21/2018 11:11 pm »
ISRO scouting for new location on Gujarat coast for SSLV
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In addition, ISRO is scouting for a location on the western sea coast near Gujarat to set up another launch pad for Small Satellite Launch Vehicles (SSLV).
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“We have evaluated several locations. The first two SSLV launches will take place from Sriharikota. After that they will move to the new location,” the official said.

This should avoid the payload loss due to dog-leg for SSLV.

But I hope the choice of Gujarat on the west coast wasn't a political move as it happens to be the home state of the Prime Minister. A launch base on the east coast would have been more safer for strategic reasons. Unless they plan to do launches to retrograde orbit as well that is, in which case a launch location on the west coast would have made better sense.

Offline advaidhya

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Re: SSLV set to launch by 2019
« Reply #49 on: 09/24/2018 06:04 pm »
Why can't the launch be made from West bengal or odisha or even Lakshadweep?

Online Vikranth

Re: SSLV set to launch by 2019
« Reply #50 on: 09/25/2018 02:07 pm »
As of equatorial launches,Shriharikota is an optimal location as earth additional 0.4 km/s advantage and Shriharikota is a very unique place that meets the requirement of ISRO.SHAR is both accessible as well as relatively less uninhabited.SHAR is on an island touching pulicat lake which has advantages for polar as well as equatorial launches.

Offline Steven Pietrobon

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Re: SSLV set to launch by 2019
« Reply #51 on: 09/26/2018 06:53 am »
SHAR is both accessible as well as relatively less uninhabited.SHAR is on an island touching pulicat lake which has advantages for polar as well as equatorial launches.

How is it an advantage for polar when you have to do a huge dog-leg maneuver during flight to avoid overflying Sri Lanka?
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Sridhar

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Re: SSLV set to launch by 2019
« Reply #52 on: 12/10/2018 05:28 pm »
The ideal location for polar launches is on the Tamil Nadu coast between Rameswaram and Kanyakumari. 

1. No dog leg maneuvers around Sri Lanka.  In fact, there is no land mass between this coast and Antarctica

2. This part of the coast sees fewer cyclones

3. Easy transportation from ISRO's development, testing and production centres at Thiruvananthapuram, Valiamala, Mahendragiri, Sriharikota and Bangalore. 

4. Safe from a strategic point of view

Gujarat coast does not make that much sense to me.

In fact, ISRO had considered a launch site at Kulasekarapatnam in Tuticorin district for these very reasons.

Offline K210

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Re: SSLV set to launch by 2019
« Reply #53 on: 12/12/2018 07:31 am »
I would say the best location for polar launches would be from west bengal

- No overflying sri-lanka
- Able to stay in sight of indian ground stations the entire mission duration thereby simplifying mission planning
- No longer having all launch infrastructure in one part of country (Not a good idea from a strategic perspective)

Offline A.K.

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Re: SSLV set to launch by 2019
« Reply #54 on: 12/12/2018 11:06 am »
I was wondering why we didn't choose to make LV manufacturing & launch facilities at Lakshdweep or A&N Islands.

Offline A.K.

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Re: SSLV set to launch by 2019
« Reply #55 on: 12/21/2018 06:38 am »
Design for Small Satellite Launch Vehicle ready
https://www.thehindu.com/news/national/kerala/design-for-small-satellite-launchvehicle-ready/article25792402.ece
From article:
Quote
On the launchpad, the SSLV will stand 34 metres tall, 10 metres shorter than the Polar Satellite Launch Vehicle (PSLV) and around 15 metres shorter than the Mk-II version of the Geosynchronous Satellite Launch vehicle (GSLV). It is also a ‘thinner’ launch vehicle, possessing a diameter of just two metres.
Quote
With a lift-off mass of 120 tonnes, the SSLV can place a 500 kg payload at a height of 500 km in the Low Earth Orbit (LEO). The SSLV has three solid motor stages, and like the PSLV and GSLV, can accommodate multiple satellites, albeit smaller ones. Unlike the PSLV and GSLV, the SSLV can be assembled both vertically and horizontally.

Online chetan_chpd

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Re: SSLV set to launch by 2019
« Reply #56 on: 01/18/2019 02:01 pm »
SSLV
1. To be tested this year.
2. Can be made ready by 6 people in 72 hours for launching 500 Kg payload in orbit on short notice.

(ISRO chairman press conference highlights
https://www.chetansindiaspaceflight.com/2019/01/news-update-isro-chairman-press.html)

Tags: SSLV ISRO