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Old January 14th 04, 03:06 AM
Tarver Engineering
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"machf" wrote in message
...
On Mon, 12 Jan 2004 08:04:07 -0800, "Tarver Engineering"
wrote:


"machf" wrote in message
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On Sun, 11 Jan 2004 09:57:12 -0800, "Tarver Engineering"


wrote:

Actually, once the notch filter was adjusted such that the wing did

not
delaminate, there was no benifit to forward swept wings.

Uh... excuse me, but what's a "notch filter" in this context?


In the feedback control system of the X-29 was a z-transform type filter

at
3.2 Hz. This was a simple third order filter in the original airframe.
Once the filter was altered to eliminate the flutter problem on the

second
airframe, there was no manuverability advantage. The first airframe

having
a delaminated wing by that time.

Oh, I see... I forgot that the X-29 had to rely heavily on electronics,

and
thought maybe it was some mechanical equivalent or something. Thanks for
clearing that up.


It could have been done mechanically, as the Russians have proven.

Ah, z-transforms... It's been quite a while, but I used to be pretty good

at
that stuff.


One of the people that worked for me at NASA got tasked with commenting the
original FORTRAN and came to me for help understanding what Mr. Main had
written. He was completely dissatisfied with what a third order filter does
and was certain the software did nothing.