ATK's Liberty rocket hopes to launch in 2015

In article 79c45ec3-c78e-4d00-aa66-a17fc77ebba7
, says...

On May 10, 6:25 am, JF Mezei wrote:
http://www.bbc.co.uk/news/science-environment-18017216

-Uses an extended SRB for first stage (I believe only a 4 segment one)

-Uses Ariane 5 liquid first stage as its second stage with modified
Vulcain engine for air-start. (interesting that they think they can do
it with Vulcain but it was too difficult for Shuttle main engines)

Why not use an Ariane 5 rocket or Delta 4 and focus on the capsule ?

Shuttle was 56m tall
Ariane 5 is 51m tall
Liberty would be 91m tall.

whats their cure for solids vibration?

This has been talked about to death in terms of Ares I. I'm sure ATK
will use all the tricks NASA was going to use on Ares I on Liberty.

The shuttle ride was rough until the solids dropped off. I'd imagine
Liberty will be similar, even with all of the "fixes".

AND the shuttle had a much larger and somewhat more flexible mass to absorb
a bit of the vibration.



Jeff

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Greg D. Moore http://greenmountainsoftware.wordpress.com/
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