Re: Naming 'the stick'

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

.

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