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Old 02-14-2012, 09:04 PM   #31
Urwumpe
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Quote:
Originally Posted by MattBaker View Post
 Hop on the train when everything is done already by someone else?
And the upper stage seems to be fine, why build a new one that has never flown? Vega seems to work fine, so don't bring in new risk factors.
It is no new plan to give Vega a German or French upper stage because of their expertise with liquid propellant engines. It simply never happened because of the way how ESA is permitted to spend the money.

In simple words: ESA has to spend their money like the member nations pay. That means that the small nations also need to get a chance to lead a bigger project, and not just have Germany, France and UK lead everything. A Ukrainian upper stage was the prize for not one country swapping places with Germany on a project that the other country can not do as well (yet).

Now that the first phase of Vega is done, Germany can really jump on the train for the follow up work, but that is politics again.
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Old 02-16-2012, 02:08 PM   #32
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Parabolic Arc: Officials Eye New Upper Stage for Vega Rocket
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Old 02-16-2012, 02:32 PM   #33
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Ukraine has the experience of building the proven RD-series ex-Soviet rocket engines, and can do it for cheap, I guess it was also a consideration.

My question would be : by how much a high-tech LOX/LH2 upper stage (like the Ariane's one) would boost the payload capacity of Vega ? And it is economically viable (what makes a light launcher attractive are low manufacturing & operation costs) ?
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Old 02-16-2012, 03:57 PM   #34
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What thrust range are we talking about for this upper stage? If it's in the 30,000 lbf range, Just wait for the Aerojet NGE to arrive.
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Old 02-16-2012, 04:46 PM   #35
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It's the AVUM of Vega, so basically nothing for orbit insertion, more for fine-adjusting of your orbit.
So we're talking about 2,45 kN or 550 lbf.
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Old 02-16-2012, 04:48 PM   #36
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Ok, that's not a very common cryogenic engine size. Going to have to be custom made for the AVUM stage.
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Old 03-12-2012, 07:10 PM   #37
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ESA: Building Vega meant testing materials to their limits
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Old 06-21-2012, 05:21 PM   #38
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Space News: 2014 Vega Launch Booked for Kazakh Satellite:
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PARIS — Kazakhstan’s DZZ-HR optical Earth observation satellite will be launched aboard Europe’s new Vega small-satellite vehicle in mid-2014 under a contract announced June 20 by the Arianespace launch consortium of Evry, France.

The 900-kilogram DZZ-HR is under construction by Astrium of France as part of a broad space-cooperation agreement signed by the French and Kazakh heads of state in 2010. It will be able to detect objects as small as 1 meter in diameter from a sun-synchronous orbit 750 kilometers in altitude.

{...}
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Old 02-04-2013, 03:48 PM   #39
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ESA: First stage of Vega VV02 arrives at Europe's Spaceport
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