Re: Feedline on the exterior

In article <0001HW.BF105E08029CBFCCF0284550@xxxxxxxxxxxxxxxxx>, Herb Schaltegger <herb.schaltegger@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> On Fri, 29 Jul 2005 22:17:43 -0500, Jim Anderson wrote
> (in article
><rjCGe.47368$5N3.32818@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>):
>
>> 'm still curious about the net effect of
>> having the PAL ramp in the first place on aerodynamics.
>
> The PAL ramp is there to help prevent side loads on the fluid lines due
> to flows across (tangentially) the ET, not flows along it lengthwise.
> It's questionable exactly how much side-loading there really is and if,
> in fact, a PAL ramp of the kind used is really necessary at all.

FWIW, at an earlier press conference, a SSP manager said that they ran a
lot of wind tunnel and computational fluid dynamics (CFD) tests with and
without the PAL ramp.

He then said something to the effect of '...the aero guys *demanded*
this' as it was seen as the most effective way of dealing with that issue.

http://www.spaceflightnow.com/shuttle/sts114/050728hallock/

(The quote is at the end of the article.)

-Dan
.