Re: Naming 'the stick'


"George William Herbert" <gherbert@xxxxxxxxx> wrote in message
news:11bcs8u6sp6trd4@xxxxxxxxxxxxxxxxxxxxx
> Murray Anderson <murraya@xxxxxxxxxxxx> wrote:
> >"George William Herbert" <gherbert@xxxxxxxxx> wrote:
> >> I would appreciate seeing some documentation or other
> >> supporting evidence that 100klb upper stages were
> >> intended or are supported by the existing EELVs.
> >>
> >> I certainly don't want to claim you couldn't make the
> >> design modifications... adding tank strength is not
> >> a fundamentally hard thing. But it requires a whole
> >> new structural and flight analysis, so it's a Big Deal.
> >
> >The latest Atlas Mission Planner guide, page 8-9, figure 8.3.1-2, gives
39.4
> >tons to 100 nm orbit for the Atlas V Heavy with wide-body Centaur stage.
The
> >stage is intended to be variable-length with minimal propellant loading
1.5
> >x current Centaur. So the CCB must be capable of taking a load of over 70
> >tons, perhaps with some reinforcement, though that isn't mentioned.
There'd
> >have to be a new trajectory analysis because of the different wind loads
on
> >the wider upper stage.
> >See http://www.ilslaunch.com/missionplanner/pdf/AMPG10_Sec_8.pdf
>
> 1) Sec 8 differs in the Rev 10 all-one-document version to the
> separate Sec 8 by itself rev 10 version you reference above.
> I should send a note to ILS tomorrow. Their document revision
> control broke.
>
> 2) The design for the A-V CCB originally intended to carry a standard
> Centaur and payload only, not the wide body model. It wasn't in the
> design or planning scope at the time. CCB upgrades are said to
> be required to support the heavier stages.
>
>
> -george william herbert
> gherbert@xxxxxxxxx
>

Yes, the latest full version has 43.7 tons for Atlas V Heavy 100 nm orbit.
Perhaps they've been reading this newsgroup :)

Murray Anderson


.

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