ISRO's Reusable Launch Vehicles

[sasum]

There would be NO PARACHUTE. The vehicle would have made manoeuvres to landed perfectly horizontal on the water surface.

I expected this arguement !!!!
Naval aircrafts land on deck horizontally with parachute leashing it from behind. The parachute is deployed just before touch down when no other maneuver is required/ desired except deceleration. A winged RLV can be made to do the same.

 

[Screambowl]

I expected this arguement !!!!
Naval aircrafts land on deck horizontally with parachute leashing it from behind. The parachute is deployed just before touch down when no other maneuver is required/ desired except deceleration. A winged RLV can be made to do the same.

there WILL be PARACHUTE WHEN it LANDS on THE STRIP. But THIS TeST was Without Parachute.

Splash on water and disintegrate. This was the plan. As no Undercarriage was installed.

 

[sasum]

http://www.ndtv.com/india-news/isro-to-look-at-possibility-of-recovering-rocket-stage-1409084

"We will soon be testing - may be this June - our air breathing engine fitted to a sounding rocket," Mr Sivan said"

read the last part..

This june.. May is almost over.. quite exciting..

Akash has an air-breathing engine..don't know Ram or Scram.

 

[Gessler]

Akash has an air-breathing engine..don't know Ram or Scram.

Akash has Ramjet.

.................................................

 

[abingdonboy]

I expected this arguement !!!!
Naval aircrafts land on deck horizontally with parachute leashing it from behind. The parachute is deployed just before touch down when no other maneuver is required/ desired except deceleration. A winged RLV can be made to do the same.

Which naval aircraft makes use of a parachute on landing? On carriers, aircraft (with the exception of V/STOL fighters) are "recovered" to the deck with the use of arrestor wires that are "hooked" by tail hooks on the aircraft.

In the case of the RLV in this test it was ALWAYS intended to disintergrate in the Bay of Bengal and never be recovered. After gliding back down it conducted a "simulated landing" on a simlulated runway in the middle of the water. The full size version will be landing (with undercarriage) on a yet to be made 5KM runway in Southern India so as to be fully re-useable. The purpose of this test was to validate the design and control functions of the vehicle which seem to have performed optimally so it was a full success.

 

[abingdonboy]

K. Sivan, a scientist involved in the latest project, said the seven-metre (23-foot) long shuttle survived the test flight, and scientists hope subsequent models six times as big, to be built over the next decade, will glide safely back to land.

"We have located the place where the vehicle is floating. The landing was soft and the vehicle did not break," Sivan told AFP.

 

[pmaitra]

I checked quite a lot of news sites. Only two of them had the correct picture of the RLV-TD. Rest of them all had old pictures of PSLV and GSLV launches. Sorry if a repost. I haven't had time to check all the posts.

RLV-TD from The Hindu

RLV-TD from BBC

 

[pmaitra]

Ok, I see @Prashant12 has posted some excellent pictures. Saw them now. Thanks for the photos.

 

[sasum]

@abingdonboy . I have not denied the arrestor wire routine. But Parachute assisted deceleration is also resorted to when pilot fails to slow down by deploying airbrakes. Here is a pic of Tejas landing with parachute-assistance.

 

[abingdonboy]

@abingdonboy . I have not denied the arrestor wire routine. But Parachute assisted deceleration is also resorted to when pilot fails to slow down by deploying airbrakes. Here is a pic of Tejas landing with parachute-assistance.
View attachment 8717

No, I understand where you are coming from brother and I'm not denying that parachute assisted landings are commonplace for fighters landing on shore but for carrier fighters it is VERY different. The limited deckspace/landing area mean that parachutes are NEVER used as they don't offer the requisite speed break, this is why the tail hook/arrested landings take place. HOWEVER, where this is not possible (fault with the hook/undercarriage failure) the carrier crews utilise barrier/barricades in emergencies:

This is even fitted at some shore air bases- the iAF has a number of airbases with such systems in place for example.

 

[pmaitra]

@Sakal Gharelu Ustad @pmaitra @Yusuf @sayareakd

Can we have a sticky thread for Indian Space news. Outside defence and strategic issues , sticky under Indian affairs or Indian Defence?

I think we can make ISRO News and Updates sticky.

 

[sasum]

No, I understand where you are coming from brother and I'm not denying that parachute assisted landings are commonplace for fighters landing on shore but for carrier fighters it is VERY different. The limited deckspace/landing area mean that parachutes are NEVER used as they don't offer the requisite speed break, this is why the tail hook/arrested landings take place. HOWEVER, where this is not possible (fault with the hook/undercarriage failure) the carrier crews utilise barrier/barricades in emergencies:

This is even fitted at some shore air bases- the iAF has a number of airbases with such systems in place for example.

Tailhook landing is the norm on carriers when airbrakes have already managed to slow down the Jet. However, when pilots have to land 'with the wind' (wind behind them) airbrakes don't reduce speed sufficiently. In that case pilot deploys parachute to induce drag. You can watch clips of such landings on deck on youtube. I can't give links readily.

 

[pmaitra]

Regarding decelerating after landing, I would go with the preferred approach, i.e. to use parachutes.

Spoiler: Discovery landing

Spoiler: Buran landing

Using arrestor wire risks damaging the heat shield tiles that are not only applied to the bottom, but also to the edges and the nose.

 

[pmaitra]

Its some what secret.......

Btw always found something similar here

What's will all the secrecy ??

Its not like that we are testing a nuke delivery system which can change directions and glide to a target at high speed and linked to MIRV developments .

Its not like we are testing something new and advanced and don't want copy and paste from others.

Its not like we did something new and challenging that is good.

Oh wait !!

I think ISRO is not considering this as a Space Shuttle mission. Rather, this is a stepping stone towards the Space Shuttle mission. This launch was a technology demonstrator (which is why they are not calling it RLV, but RLV-TD), and there will be few more I think.

 

[Prashant12]

RLV-TD Take off from onboard camera.

 

[Prashant12]

Runway for space shuttle coming up at Sriharikota

The project report, readied a couple of years back, is likely to be fast-tracked following the success of the first Hypersonic Experiment of RLV. | (File Photo | PTI

CHENNAI: A 5-km runway is coming-up at the nation’s spaceport, Sriharikota, to facilitate the landing of Reusable Launch Vehicle (RLV), which is under development.

The project report, which has been readied a couple of years back, is likely to be fast-tracked following the success of the first Hypersonic Experiment of RLV on Monday.

ISRO sources told Express that a site has already been identified near the Augumented Satellite Launch Vehilce (ASLV) complex. ASLV is now non-operational.

After the Hypersonic Experiment, there would be landing experiment (LEX), return flight experiment (REX) and scramjet propulsion experiment (SPEX).

To carry out the further experiments in the category, ISRO needs a runway to retrieve and reuse the vehicle, the sources said.

When asked, K Sivan, director, Vikram Sarabhai Space Centre (VSSC), said the proposal was already there and a final approval has to be obtained before the work commences.

http://www.newindianexpress.com/cit...-at-Sriharikota/2016/05/24/article3448064.ece

 

[Indx TechStyle]

RLV Take off Videos
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[abingdonboy]

Tailhook landing is the norm on carriers when airbrakes have already managed to slow down the Jet. However, when pilots have to land 'with the wind' (wind behind them) airbrakes don't reduce speed sufficiently. In that case pilot deploys parachute to induce drag. You can watch clips of such landings on deck on youtube. I can't give links readily.

I am yet to see a single instance of a parahute being deployed where an arrestor landing takes place. There is simply no need for an extra deceleration device when you have an arrestor wire- the force it exerts is immense and it is able to halt even a large C-2 in a matter of 100m. Where is the need for a parachute on a carrier a/c? I just don't see it. And as I have said, where the tail hook/arrestor wire fails the last ditch option is for the "barrier" landing. Parachutes just don't provide sufficent deceleration on the limited deck of a carrier.

Regarding decelerating after landing, I would go with the preferred approach, i.e. to use parachutes.

Spoiler: Discovery landing

Spoiler: Buran landing

Using arrestor wire risks damaging the heat shield tiles that are not only applied to the bottom, but also to the edges and the nose.

Of course for a shuttle/RLV using a parachute for deceleration is the optimal solution. I am simply refering to carrier fighters specifically and addressing the point about parachutes being used for tail hook landings- which they simply aren't.

 

[sayareakd]

Guys i found this


strange flight trajectory is almost same.

 

[Indx TechStyle]

ISRO’s Reusable Launch Vehicle: What Happened and What Next?