Author Topic: Arianespace Q&A  (Read 31498 times)

Offline DorianH

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Re: Arianespace Q&A
« Reply #20 on: 07/14/2016 08:20 pm »
Hello everybody, has anybody ever visited the Kourou space port to watch an Ariane launch? I'm considering it and would appreciate your input. Thanks!

Offline Skylab

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Re: Arianespace Q&A
« Reply #21 on: 01/16/2017 07:11 pm »
To all admins/mods,
Wouldn't it be a good idea to keep all Q&As in one place to avoid confusion? Feel free to remove this post, but it seemed the best place for this suggestion.
« Last Edit: 01/16/2017 07:12 pm by Skylab »

Offline KaluzaKlein76

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Re: Arianespace Q&A
« Reply #22 on: 01/27/2017 07:48 am »
Hi guys,
has anybody heard about the poor quality control issues at Voronezh Mechanical Plant? I wonder whether they are applicable to the RD-0124 used on the Soyuz STB which will be used tomorrow for Hispasat AG1

Offline KaluzaKlein76

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Offline anik

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Re: Arianespace Q&A
« Reply #24 on: 09/11/2017 08:33 am »
Does anyone know what means last letters in serial numbers of Ariane rockets? Why some rockets do not have last letters? For example, there is L585a, but L586.
« Last Edit: 09/11/2017 08:33 am by anik »

Offline zubenelgenubi

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Re: Arianespace Q&A
« Reply #25 on: 06/29/2020 01:40 am »
Questions re: Kourou's climate and its relation to Arianespace launches:

The high speed winds aloft that have delayed the VV16 launch--is it wind speed only that violates launch criteria, wind shear, or both?

What causes high-altitude winds in the tropics? In the temperate latitudes, we have jet streams. Is it Hadley cells + Coriolis "force"? ITCZ?
« Last Edit: 06/29/2020 01:42 am by zubenelgenubi »
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Offline Hobbes-22

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Re: Arianespace Q&A
« Reply #26 on: 10/14/2020 05:56 am »
The Vega launcher has metallic strips (indicated on the attached photo) on the joints between each of the major assemblies. In closeups this looks like metal foil.

What is the function of those items?


Offline Remes

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Re: Arianespace Q&A
« Reply #27 on: 10/24/2020 08:18 pm »
What is the function of those items?
Maybe static discharger. Helps against the triboelectric effect.

Offline Remes

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Re: Arianespace Q&A
« Reply #28 on: 12/24/2021 10:20 am »
Does Ariane 5 has a hold down system?

Couldn't find anything, but saw this tweet:

https://twitter.com/marinakoren/status/1474021598009167877?t=XoGa7g2IErmXoc9MGBezhg&s=19

Offline JGSAeroSpaceN

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Re: Arianespace Q&A
« Reply #29 on: 02/06/2022 11:57 am »
Does Ariane 5 carry an explosive charge in case of a problem and high destruction needed?

Offline Jim

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Re: Arianespace Q&A
« Reply #30 on: 02/06/2022 12:19 pm »
Does Ariane 5 carry an explosive charge in case of a problem and high destruction needed?

Yes, see the first launch.

Offline Jim

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Re: Arianespace Q&A
« Reply #31 on: 02/06/2022 12:19 pm »
Does Ariane 5 has a hold down system?

Couldn't find anything, but saw this tweet:

https://twitter.com/marinakoren/status/1474021598009167877?t=XoGa7g2IErmXoc9MGBezhg&s=19

Titan III & IV did the same thing

Offline skater

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Re: Arianespace Q&A
« Reply #32 on: 02/07/2022 12:21 pm »
Does Ariane 5 has a hold down system?

Couldn't find anything, but saw this tweet:

https://twitter.com/marinakoren/status/1474021598009167877?t=XoGa7g2IErmXoc9MGBezhg&s=19

Titan III & IV did the same thing

Sorry for being dense, but Ariane V, Titan III and IV are not bolted down at all?! If so, I'm sure someone did the math, but I'm still quite surprised!

Offline Hobbes-22

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Re: Arianespace Q&A
« Reply #33 on: 02/07/2022 12:34 pm »
That's one advantage of solid boosters: they're so heavy you can put them on a launch platform and move the platform without them falling over.

Offline Jim

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Re: Arianespace Q&A
« Reply #34 on: 02/07/2022 12:35 pm »

Sorry for being dense, but Ariane V, Titan III and IV are not bolted down at all?! If so, I'm sure someone did the math, but I'm still quite surprised!

The Titans only used their solids for launch and hence there was no need to hold down for liquid engine start.
The thrust of the core of the Ariane was not enough to lift the vehicle, so no need for hold down. 
The mass of the solids on both vehicles is what keeps them stable.

Delta II did not have a hold down for launch.  It did have some screws for support and winds that were withdrawn remotely during the beginning of the countdown. Once the vehicle was loaded with propellant, they were not needed.  Also, the core engine was not enough thrust to lift the vehicle.

Offline Hog

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Re: Arianespace Q&A
« Reply #35 on: 02/10/2022 12:40 am »
That's one advantage of solid boosters: they're so heavy you can put them on a launch platform and move the platform without them falling over.
SLS is bolted down to the ML and unbolted prior to launch.  No more NSD blowing frangible nuts at T-0 like STS launching from MLP.  The sidemount shuttle introduced some interesting load paths that aren't present with SLS. ie twang loading.
Paul

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