Re: Griffin Wants Inline SDLV and 5 Segment SRB/CEV

Scott Lowther <scottlowther@xxxxxxxxxxxxxxxxxxxxxx> wrote in
news:xYGxe.97$JO3.35@xxxxxxxxxxxxx:

> Jorge R. Frank wrote:
>
>>Scott Lowther <scottlowther@xxxxxxxxxxxxxxxxxxxxxx> wrote in
>>news:M7Axe.343$j21.231@xxxxxxxxxxxxx:
>>
>>>Kim Keller wrote:
>>>
>>>>>It wouldn't entirely surprise me to see the first qualification
>>>>>launche of the 5-segment stick booster (no upper stage) by late
>>>>>2006, using Pad 39B and the third MLP as infrastructure.
>>>>>
>>>>There's no way the avionics and the TVC system will be ready for
>>>>test by then.
>>>>
>>>Errrrrmmmm... the TVC system is available *now.*
>>
>>In two axes (pitch and yaw, or more precisely rock and tilt) only. A
>>single SRB has no roll control.
>>
> Yes, the roll control system will need development. But that's not
> "thrust vector control."

Technically, yes, you are correct. Pitch and yaw is adequate to determine
the direction of the thrust vector, while roll is just the rotation about
the thrust vector. Kim and I should have been more precise in our
terminology.

However, that does not change Kim's basic point: without roll control,
there is no way in hell that The Stick will be ready for qualification
flights by late 2006. And honestly, I'd be pleasantly surprised if ATK was
ready to demonstrate SRB roll control *in ground test*, let alone flight
test, by the end of *2008*.

--
JRF

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