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psm(at)ATT.NET
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 Posted: Sun Dec 23, 2007 2:35 pm Post subject: 601Wing Failures - a different perspective601Wing Failures |
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Hi Mack,
If, indeed, you experience control flutter, the only way to stop it
is to immediately pull up and reduce airspeed. If you survive that
(which is unlikely) then you should land quickly and do a thorough
inspection of the damaged area.
However, I don't think this is a problem with any of the Heintz
designs. The control structures are very rigid and don't lend
themselves to flutter. Also, this is a problem which usually shows
up on high speed airplanes at speeds way beyond those achievable in our planes.
The problem which I think is a remote possibility is some sort of
resonant vibration or oscillation that could occur under some
condition not normally experienced in flight. This is what happened
to destroy many early models of the Lockheed Electra that broke apart
in flight. There was a resonant condition that came up with the
fuselage that was forever fixed with a small design change. Unlike
control flutter, there is no obvious action to take if this occurs to
you in flight. Perhaps a change in flight conditions by a rapid
change in attitude or speed might help.
There is one report I remember of an XL pilot who flew over a power
plant and experienced a loud vibration which he thought was in the
wings. He took some drastic action and the vibration stopped. I
don't think there was any obvious damage from this incident.
This is all very mysterious to me, and I don't know of any way to
prove there is or is not a problem with the design. As I posted
earlier, I added gussets at the top end of the wing attach uprights
in a fashion similar to the gussets on the main landing gear
uprights. This change was approved by ZAC without them saying it
would help but they did say it wouldn't hurt anything. I did it with
the idea of stiffening the fuselage in the wing attachment area.
Paul
XL fuselage
At 02:08 PM 12/23/2007, you wrote:
| Quote: |
Ladies and Gentlemen:
Wing flutter, aileron flutter or whatever -- if any of us experiences this
phenomenon, what is the corrective action? I understand that we have a
minimal amount of time!
Mack
601XL
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planecrazydld(at)yahoo.co
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| Posted: Sun Dec 23, 2007 4:52 pm Post subject: 601Wing Failures - a different perspective601Wing Failures |
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not to be too picky Paul, but I thought I recalled the issue with the early Electras to be a engine/nacelle whirl mode pnenomenon?
Paul Mulwitz <psm(at)att.net> wrote:[quote] --> Zenith-List message posted by: Paul Mulwitz
Hi Mack,
If, indeed, you experience control flutter, the only way to stop it
is to immediately pull up and reduce airspeed. If you survive that
(which is unlikely) then you should land quickly and do a thorough
inspection of the damaged area.
However, I don't think this is a problem with any of the Heintz
designs. The control structures are very rigid and don't lend
themselves to flutter. Also, this is a problem which usually shows
up on high speed airplanes at speeds way beyond those achievable in our planes.
The problem which I think is a remote possibility is some sort of
resonant vibration or oscillation that could occur under some
condition not normally experienced in flight. This is what happened
to destroy many early models of the Lockheed Electra that broke apart
in flight. There was a resonant condition that came up with the
fuselage that was forever fixed with a small design change. Unlike
control flutter, there is no obvious action to take if this occurs to
you in flight. Perhaps a change in flight conditions by a rapid
change in attitude or speed might help.
There is one report I remember of an XL pilot who flew over a power
plant and experienced a loud vibration which he thought was in the
wings. He took some drastic action and the vibration stopped. I
don't think there was any obvious damage from this incident.
This is all very mysterious to me, and I don't know of any way to
prove there is or is not a problem with the design. As I Be a better friend, newshound, and [quote][b]
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