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Ariane 5 launch today, livestream.

H2O.

By H2O.
in Science & Spaceflight

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Hcube

Hcube

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Need. To. Sleep... I hope the launch is early in the window

EDIT : Stream started !

I whish the french guys spoke french... their english is... weird. FR subbed in english would have been good

Edited by Hcube
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Hcube

Hcube

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http://www.arianespace.tv/ ? nothing particular here. It works fine... Although im in France, maybe the stream does not get updated everywhere at the same time

Always impressed by how thin and small the umbilical tower is for Ariane 5

- - - Updated - - -

LIFTOFF !

Edited by Hcube
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Camacha

Camacha

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What is the TTW of the Ariane 5? It really seemed to sprint out of the blocks, not the slowly heaving itself into the skies other large rockets seem to do.

Always impressed by how thin and small the umbilical tower is for Ariane 5

It does not seem exceptionally slim to me. Maybe compared to the classic towers, but those were quite beefy.

Edited by Camacha
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Hcube

Hcube

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What is the TTW of the Ariane 5? It really seemed to sprint out of the blocks, not the slowly heaving itself into the skies other large rockets seem to do.

Liftoff TWR is 1.82 , but Ariane 5 does not clear its tower faster than Vega. Vega lifts off like a bullet.

Have you noticed how the actual liftoff is 7seconds after the 0:00 mark ? i wonder why the Vulcain 2 ignition sequence isn't started 7seconds sooner... All the other rockets time the ignition sequence so that the liftoff occurs at 0:00

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Camacha

Camacha

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Liftoff TWR is 1.82 , but Ariane 5 does not clear its tower faster than Vega. Vega lifts off like a bullet.

I might be mistaking, but is the Ariane not well over 4 times heavier? Though 1,82 still seems like quite a lot and pretty much confirms what you see at launch :)

Edited by Camacha
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Hcube

Hcube

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I might be mistaking, but is the Ariane not well over 4 times heavier? Though 1,82 still seems like quite a lot and pretty much confirms what you see at launch :)

Yeah Vega is about the size and mass of one of Ariane 5 's EAP (SRBs).

The Ariane being heavier means nothing about its TWR relative to vega, since it also has more thrust... or were you talking about something different ?

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Camacha

Camacha

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Is there any somewhat detailed info on the ascent profile of this mission? I am somewhat curious about how it works exactly, as they seemed to have burned continuously since launch until the release of the first satellite.

The Ariane being heavier means nothing about its TWR relative to vega, since it also has more thrust... or were you talking about something different ?

I was referring to my earlier comment about the heavier rockets typically heaving themselves into the skies, rather than the bottle rocket Ariane 5 seems to be. If Vega is indeed faster, its TTW has to be higher of course (since other factors like drag will not play that big of a role).

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Hcube

Hcube

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Is there any somewhat detailed info on the ascent profile of this mission? I am somewhat curious about how it works exactly, as they seemed to have burned continuously since launch until the release of the first satellite.

I was referring to my earlier comment about the heavier rockets typically heaving themselves into the skies, rather than the bottle rocket Ariane 5 seems to be. If Vega is indeed faster, its TTW has to be higher of course (since other factors like drag will not play that big of a role).

Oh i see what you meant.

Not sure about the ascent profile data ; but i'm pretty sure that if you dig deep enough you will find some very interesting info. It seems that the CNES, ESA and Arianespace websites give very limited info on this.

What orbits were the payloads delivered to ? GTO ? If so, the second stage may have burnt non-stop between LEO injection and boost to GTO, and then released the satellites soon after shutdown while coasting to apoapsis.

Edited by Hcube
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Scotius

Scotius

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We are launching our satellites, probes, stations, men and women to space on top of pillars of roaring continuous explosions - space exploration is all about hubris and awesomeness :D Besides... old gods resided in the clouds and on mountain tops - now we can look down at them FROM SPACE! (and rain debris on their homes).

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H2O.

H2O.

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Have you noticed how the actual liftoff is 7seconds after the 0:00 mark ? I wonder why the Vulcain 2 ignition sequence isn't started 7seconds sooner... All the other rockets time the ignition sequence so that the liftoff occurs at 0:00

I guess it is because they use the burn-time of the vulcain for calculations and don't want to be disturbed by another number on TV that will simply be burn time + 7 (just a guess).

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