Why a Swept-Wing?

"machf" wrote in message
news
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.

On Mon, 12 Jan 2004 08:04:07 -0800, "Tarver Engineering"
wrote:


"machf" wrote in message
news
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.
Ah, z-transforms... It's been quite a while, but I used to be pretty good at
that stuff.

--
__________ ____---____ Marco Antonio Checa Funcke
\_________D /-/---_----' Santiago de Surco, Lima, Peru
_H__/_/ http://machf.tripod.com
'-_____|(

remove the "no_me_j." and "sons.of." parts before replying

"machf" wrote in message
...
On Mon, 12 Jan 2004 08:04:07 -0800, "Tarver Engineering"
wrote:


"machf" wrote in message
news
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.