Questions tagged [ariane]

Questions about the ESA launch Ariane. There were multiple versions, with Ariane 5 being active currently.

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Ariane 6 upper stage schematic showing integration of APU

I've been reading about the Auxiliary Power Unit (APU) on the Ariane 6 upper stage and am looking for a schematic showing how it's integrated into the stage. From Thermal Control of the Cryogenic ...
Organic Marble's user avatar
2 votes
2 answers
353 views

Why is the Ariane 5 shorter than the Ariane 4?

Looking at below image, which compares heights of rockets, I couldn’t help but notice that the Ariane 5 was a short and fat rocket compared to the Ariane 4 (tall and thin). Why would this be ...
Blue Skin and Glowing Red Eyes's user avatar
10 votes
2 answers
3k views

What does the Ariane 5 rocket use to turn?

I noticed that the Ariane 5 does not have wings. It also does not have RCS thrusters except for sometimes with its payload, but that is not being used during liftoff. I tried to find some methods it ...
The Rocket fan's user avatar
6 votes
1 answer
841 views

How much fuel did JWST save due to an accurate launch, and how much will remain after L2 orbit?

How much fuel did JWST save due to an accurate Arianne 5 launch, and how much fuel will be remaining after JWST L2 orbital insertion? And how many years is that fuel expected to last? According to ...
Sheldon's user avatar
  • 555
2 votes
1 answer
141 views

Why is Ariane-5's upper stage appear to vent exhaust post engine cut off?

I was surprised to see, with unaided eyes, a rocket like object in the skies on Dec 25, 2021 (Indian time) around the same time as JWST launch. My coordinates were approximately ...
karthikeyan's user avatar
  • 4,469
4 votes
1 answer
199 views

How long does it take for Ariane 5 to roll to the launch pad?

The launchpad is 2800 m away from the building where Ariane 5 is assembled. Based on the Ariane 5 user manual, Section 7.5.5, Figure 7.5.5.4.b, the Ariane 5 transfer to launchpad happens one day ...
usernumber's user avatar
  • 5,048
5 votes
1 answer
437 views

Is the Ariane 5 rolled out or is the hangar moved away?

Ariane 5 rockets (like the one carrying the JWST) are assembled upright in a hangar, but during the launch (obviously) the hangar is no longer around the rocket. Does the Ariane 5 roll out of the ...
usernumber's user avatar
  • 5,048
10 votes
1 answer
606 views

What happens if Ariane V actually fails while launching JWST?

Obviously, I don't expect this. But I was thinking about it, and the importance, uniqueness, and irreplaceability of this payload is almost (?) unprecedented, especially for a transnational project. I ...
Anton Hengst's user avatar
  • 10.7k
3 votes
0 answers
172 views

Rocket Engine - Actuator in Loop Simulations

For Actuator-In-Loop simulations, why are the rocket engine nozzles along with the thrust vector control assembly (including the actuators) kept inverted on a platform like in the attached image or as ...
Adhithya's user avatar
  • 101
3 votes
1 answer
185 views

Does RUAG Space recover and reuse Ariane 5 and Atlas V payload fairings after splashdown?

RUAG Space is the company that manufactures payload fairings for the Ariane, Vega, Atlas V (500 series) and the upcoming Vulcan. Back when Spacex started trying to catch the fairing without it hitting ...
Speedphoenix's user avatar
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8 votes
1 answer
105 views

Increase in period and semi-major axis following near head-on collision between Cerise and Ariane debris (1996)

This report describes the collision of the French satellite Cerise with a piece of Ariane rocket debris (object no. 18208) in 1996: http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?...
JeffB's user avatar
  • 81
1 vote
1 answer
316 views

Will Ariane 5 ECA have LES for the launch of JWST?

Ariane 5 rocket is contracted to launch JWST. This rocket has approximately one failure out of every fifty launches (excluding minor failure). JWST has already taken many years and it is next ...
Auberron's user avatar
  • 1,506
12 votes
1 answer
994 views

Why does the core stage of the Ariane 5 produce more thrust in vacuum?

In listening to a youtube video that was discussing the Ariane 5, the narrator noted briefly in passing that the Vulcain 2 engine produced more power thrust in a vacuum than it did at sea level. Not ...
RoboKaren's user avatar
  • 1,163
7 votes
2 answers
472 views

Does Arianespace have a modified Soyuz launch vehicle?

Ars Technica's OneWeb joins the satellite Internet gold rush this week says: The company chose to partner with Arianespace and its modified Soyuz launch vehicle for the 2020 launches because, ...
uhoh's user avatar
  • 149k
4 votes
0 answers
130 views

Why do panels fall off of Arianes 1-4 on launch? [duplicate]

I hope this isn't a duplicate. In earlier Ariane rockets, there's a lot of panels which seem to fall off of the interstage immediately upon liftoff, exposing a highly reflective surface. Source: ...
Anton Hengst's user avatar
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3 votes
1 answer
403 views

Why is ESA developing the Vinci engine rather than buying RL10Bs?

The Vinci engine seems very very similar to the RL10B. Both are hydrolox expander-cycle engines with 465 s Isp and extendible nozzles with a ~250:1 expansion ratio. The biggest difference is that the ...
Anton Hengst's user avatar
  • 10.7k
7 votes
0 answers
129 views

How long does the SYLDA fairing stay in orbit after deploying?

For dual-manifest missions, Ariane 5 often uses the Système de Lancement Double or SYLDA system to encapsulate the lower of two stacked satellites. It can be seen in the following image encapsulating ...
quinnkenri's user avatar
  • 1,130
15 votes
1 answer
3k views

What's the shiny silver turnip on the bottom of this Ariane 5 launcher?

The beautiful cutaway drawing included in this answer shows a metallic turnip-shaped object attached to the bottom of the Ariane V core stage. What is that object?
Organic Marble's user avatar
6 votes
1 answer
449 views

What is this flying debris during Ariane 5 liftoff

Trigger warning: jaw-dropping picture Source: (Warning, more pictures) Ars Technica Credits: ESA/Trevor Mahlmann Launch: VA250
Antzi's user avatar
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4 votes
1 answer
1k views

Why doesn't Ariane-5 lift off at T=0 seconds?

I have seen Ariane-5 lift off at T+07 seconds and not at (or close to) T=00 seconds. The following statement is from the Ariane-5 User's Manual (Page 35, Section 2.3 - Typical Mission Profile): The ...
Vishnu's user avatar
  • 3,276
1 vote
2 answers
327 views

Could we easily build a "super-heavy" Ariane 6?

If we simply sticking 5 Vulcain engines (instead of 1 currently) and 6 powder boosters (instead of 4), could we get a super-rocket for a cheap price or is it more complicated? When I say "cheap-price",...
Bartolomo's user avatar
6 votes
1 answer
409 views

What is "additional line load" [N/mm] for the Ariane 5 launch vehicle?

In the textbook Spacecraft Systems Engineering 4th ed. page 14, table 2.1 ("Acceleration values for the Ariane 5 launch vehicle") provides data on the loading of the Ariane 5 spacecraft. One of the ...
user avatar
2 votes
0 answers
214 views

What would happen if one Ariane V SRB did not ignite properly? (there may be no lock-down mechanism)

The excellent answers to What are these circular spots on these Ariane V SRB nozzles? tend to indicate that unlike the IV, the Ariane V simply rests on two flat surfaces under the SRBs at launch time, ...
uhoh's user avatar
  • 149k
13 votes
2 answers
2k views

What are these circular spots on these Ariane V SRB nozzles?

This Space Shuttle Almanac tweet says: Pics 1-4 of todays @Arianespace #ArianeV VA249 launch carrying the #EDRSC & #Intelsat39 comsats from Kourou and includes the cool (hot) image below. ...
uhoh's user avatar
  • 149k
4 votes
1 answer
322 views

Is vertical assembly worth the cost (Ariane 6)

Very recently, ESA released a new video showing the proposed Ariane 6 rocket being assembled. This mostly takes place in a large 'moveable gantry' building where the payload is placed on top of the ...
Dragongeek's user avatar
  • 18.7k
4 votes
1 answer
418 views

Does this rocket engine test run look healthy?

The new Ariane 6's upper stage engine "Vinci" is expected to challenge the RL-10C, which is currently the most efficient chemical rocket engine on the market. The European aerospace conglomerate aims ...
Everyday Astronaut's user avatar
1 vote
1 answer
245 views

Has foam loss been observed in Ariane 5 launches?

Ariane 5 is similar to the Space Shuttle in that both vehicles are powered by SRBs and use foam insulation in cryogenic tanks. Foam shedding has been a common occurrence during the history of the ...
Mys_721tx's user avatar
  • 976
5 votes
2 answers
258 views

Ariane 4 Random Vibration

In the plot above, taken from space craft system engineering book, chapter 2. This is the plot showing the random vibration power spectrum of Ariane 4. The unit is $g^2/Hz$, I understand how the ...
zephyr0110's user avatar
  • 2,911
9 votes
2 answers
3k views

Why do Ariane rockets not have ice break off on liftoff?

In a recent question asked here, it was asked what debris falling from a Rocket Lab Electron Rocket was during launch. e.g.: The answer, was that it was ice that had formed after cryogenic fuel/...
Tom J Nowell's user avatar
10 votes
1 answer
610 views

Why aren't the Ariane 5's SRBs reused?

The Ariane 5 uses two solid rocket boosters (SRBs), which can be recovered by parachute if desired. However, unlike (for instance) the space shuttle SRBs, Ariane 5 SRBs are only occasionally ...
Vikki's user avatar
  • 4,157
4 votes
1 answer
1k views

How to identify loads for a Payload Adapter System during Rocket Launch?

Good afternoon, A classmate and me are doing a project for university in which I have to perform several structural analysis of the Payload Adaptar System 937C from Ariane V (picture shown). The ...
Roger Pedrós Bòria's user avatar
12 votes
1 answer
493 views

Are all payload fairings this floppy?

When I watched the launch of HYLAS-4 and Superbird-B3 on Ariane 5 ECA, for a moment it seemed that ESA is also experimenting with fairing recovery - with a fairing which flaps its wings and flies like ...
JohnEye's user avatar
  • 1,326
27 votes
2 answers
6k views

Will the James Webb Space Telescope be insured against launch failure?

Most commercial satellites are insured in case something bad happens on launch. Although the Ariane 5 is a fairly reliable rocket, a launch failure is not out of the question. While other questions ...
Rob Rose's user avatar
  • 369
2 votes
1 answer
260 views

Which of these configurations is preferred and why?

I came across an article with the following infographic: infographic source The GSLV rockets use solid/liquid engines as core stage and cryogenic engine as upper stage while the Ariane V rocket has ...
Mahen's user avatar
  • 23
2 votes
0 answers
72 views

Why do rockets sometimes climbs down before reaching orbital velocity? [duplicate]

Looking at this Ariane 5 launch, I notice that: the speed continously increase (as I expected) the altitude first increase as I expected, then decrease (I was not expecting that) and then increase ...
Manu H's user avatar
  • 3,780
14 votes
1 answer
2k views

How can the 6.5 m primary mirror of the JWST fit inside the 5.4 m fairing of Ariane 5?

All the variants of the payload fairing for Ariane 5 are 5.4 meters in diameter, the same as the core stage of the rocket. At the same time, the mirror of the James Webb Space Telescope is 6.5 meters. ...
SE - stop firing the good guys's user avatar
0 votes
1 answer
92 views

What is 'green green' weather?

During the today (24/08/16) launch of Ariane 5, Stéphane Israël (chairman & CEO) tells that all conditions are good, including a green green weather. Is it a shortcut for no wind, no rain, or ...
aluriak's user avatar
  • 205
15 votes
2 answers
2k views

What is the reason for the Ariane 5 launcher with Intelsat 29e losing altitude?

After reaching a peak altitude of 222 km the Ariane 5 launcher with Intelsat 29e starts to lose altitude. What is the reason for this trajectory? Youtube video Paper on Ariane 5
SE - stop firing the good guys's user avatar
8 votes
1 answer
778 views

Ariane 5 performance data for escape missions

I would like to know the performance for escape mission of the Ariane 5 launcher. More precisely, I would like "LV Performance vs. C 3" curve. My problem is, I can find this info for a lot of ...
Tonio's user avatar
  • 309
5 votes
1 answer
840 views

Which launch sites were considered for Ariane 6?

I often see it mentioned that the selection of the launch site for Ariane 6 was one of the preliminary requirements that froze its final design. That does make sense, especially since there was some ...
TildalWave's user avatar
9 votes
2 answers
985 views

Why did the US lose almost all commercial launch opportunities?

With the launch of the SpaceX Falcon 9 V1.1 Nov 25th (Assuming it succeeds), it will apparently be the first US Commercial launch (I assume to GEO, since Orbital, with all the commercial small sats ...
geoffc's user avatar
  • 79.5k
20 votes
1 answer
2k views

Ariane 4: shroud around stage?

In this image of the Ariane 4, you can see a blue shroud around the second stage. At least I think it's a shroud. It is present in many photos of Ariane 4 launches, but the drawings I've seen omit ...
Hobbes's user avatar
  • 128k
17 votes
3 answers
2k views

Why are Europe’s Air & Space Academy and DLR urging ESA and CNES to reconsider the use of solid fuels for the proposed Ariane 6?

With Ariane 6 launch site selected, CNES (Centre National d’Etudes Spatiales, the French space agency) was aiming to freeze the design of the new rocket in May 24, 2013. A few days after and that same ...
TildalWave's user avatar