Glad you found it interesting. Here's another item to disturb the
bureaucrats and bean counters. When the original nozzle plates were
procured, two spare plates were also purchased and placed in the base
warehouse as spares, in case one of the originals were damaged during
use. The need was obvious to the original project managers and went
unquestioned for many years. Then, as USAF staff turned over during the
years, someone decided that spares must be justified. If they weren't
used within some specified time period, then they were deemed surplus!
It didn't matter that the plate material was no longer manufactured, or
that procurement would take quite a period of time, even if a source
could be found.
Cooler heads prevailed, and, last I heard, the spares were still there.
Sometimes the writers of rules just don't understand that there must be
exceptions!
Jim Nichols
Tullahoma, TN USA
On 12/14/2013 10:33 AM, Chris Barker wrote:
> Thanks, Jim.
>
> I rather enjoy that sort of machinery; it’s quite reassuring that it’s
> possible (was possible) build devices of that complexity but which have
> relatively simple components. I’d guess that that assignment was a valuable
> part of your overall training and experience.
>
> Chris
>
>
> On 13 Dec 2013, at 01:42, Jim Nichols <jhnichols@xxxxxxxxxxxxx> wrote:
> snip
>> By moving all jacks simultaneously, starting together, and stopping as
>> each reached the next contour setting, we were able to minimize the
>> transient stresses. ( I had to calculate the stresses at each of about
>> 50 contour steps, to prove this was a safe approach to moving the
>> plates.) Aerodynamic shapes were provided in 0.10 Mach increments, with
>> guiding contours in between to limit the stress level of each change.
>> All jacks had to be checked and found to be "on contour" before the next
>> step was initiated.
>>
>> It was quite an assignment for a guy whose only previous experience was
>> as a USAF Lieut. serving as a project engineer in a wind tunnel at W-PAFB.
>>
>> Thanks for allowing me to go back in time. Probably a lot more than you
>> really wanted to know.
--
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