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oh Timeline.. is simply decorators used in Presentation slides. Think that those timelines have same value as timelines in "Future technology" books published in 1970s. Some technology did get realized but not as fast as they had envisaged.

What do you want to achieve which is not work in progress?

A) TVP is no STARSHIP. Its even shorter than your PSLV and comparable to SSLV. The amount of fuel carried is low. They shall be doing launch hover and landing tests. Our testing grounds are near to sea, so chances of falling onto Populated area is low.. Even if it falls - the aftermath shall...

:) so shall UDMH and N204 combo. You are missing point here - Vikas Engines are regularly ground tested. All rocket launches and retrieval happen while ensuring ground staff are at safe distance. Do you think propellant used in defence rockets are all green?

True - so how many accident like quoted have happened in ISRO in last 50 years? Or why do you think ISRO shall forgo of its established safety protocols during ADMIRE testing?

Cryos Are complicated and expensive to manufacture. You need stronger tanks for storage of cryogenic fuel At high pressure. Even production of cryogenic fuels is expensive - remember you need Liquid Oxygen and Liquid Hydrogen to be stored as propellant in those tanks.Low temp and high pressure...

good but expensive :)

The Other Engines are in various stages of development. Should be good that ISRO is working in parallel using existing technologies to develop test & validate control laws and algorithms. Once Methalox and Semi Cryo Engines come online - They shall be using those for bigger heavier reusable...

@pmaitra It will be LEO and possibly GTO. I remember an inforgraphic from ISRO depicting same. I will post if I find that link again. In the second case(GTO), the second stage would be non recoverable. Hence the clever decision to make first stage as winged, and thus avoid loosing expensive...

^ And also aid the second stage to reach higher orbit.

@pmaitra There are good interview/articles in Frontline mag(links posted in nasaspaceflight) and according to it, the current RLV isgoing to undergo radical changes. A(dvanced)RLV-TD, The winged body is going to be first stage and not last stage. as described by ISRO chairman in the interview.

Yeah you are correct, the reason was the large number of small heat shield tiles on big shuttles, multiplied the probability of their failure and were difficult to maintain (considering most of the space shuttle incidents are related to some form heat shield tile failure).

^ There will be no saddle back design for future. What US and Soviets had concluded, Big Shuttles are unsafe, move is towards smaller space planes like X-37, which will in future also carry humans in Cargo Bay. India is also following US on the same. If you see designs from ESA, JAXA, US, all...

Correct, But others too have experimented their vehicles, by sky dropping from high altitude, that is similar to what we have done. I am only comparing RLV-TD. But even TSTO is still a concept, far away, just like others before. Space projects are risky and especially when you are working...

ummm, no! US and Soviets have worked on plenty of similar kind of projects.

No! Research for DMRJ(Dual Mode Ramjet) is still going on. http://m.thehindu.com/sci-tech/science/isro-to-test-rocket-that-takes-its-fuel-from-air/article8642135.ece

TSTO Concept.........

Or a separate Sub Forum, for all discussions related to space, @Sakal Gharelu Ustad@pmaitra@Yusuf@sayareakd