larry(at)macsmachine.com
Guest
|
 Posted: Mon Jun 15, 2009 4:45 pm Post subject: [Probable Spam] Quick open poll about wing failures. |
 |
|
William Dominguez wrote:
| Quote: | Now that this topic have again resurfaced, lets cool down and do a little
open poll in the meanwhile. This is an open poll so every one is free to
keep their own count of the results.
Please respond to this thread with the number associated with your
response. You can optionally leave any comment if you wish.
When it comes to wing failures accidents in the Zodiacs 601XL fleet,
which of the following views best describe your own;
1) What wing failure accidents? There have not been any confirmed
wing failures, its all speculation.
2) There is no design issue with the plane, the reason for the accidents
are pilot error.
3) I don't know if there is a design issue or pilot error, I will hold
judgment until this whole thing clarify further.
4) There must be a design flaw with the plane and Zenith should
address it.
William,
(1) I don’t think there have been failures of “the wings”. The longer
thin-section wing may be culpable in aggravating a max-loaded short
center spar. The spar angle seems nearly 10-degrees out of plane with
flight loads (positive) and landings (negative). These may place
critically uneven stresses in the actual center spar section.
(2) I suspect long term some XL center spars may suffer from harsh
stresses at the landing gear attachment and yield to excessive
elevator force in flight with max loads. These all remain to be proven.
(3) (I lean toward item 3.) It shouldn't be said that “pilot error” is
a cause as the published performance envelope could well include the
loads at which the failures occurred.
Neither source of failure, pilot or design, have been absolutely proven.
(4) The term “design flaw” should not be used until the degree of a
design compromise that actually contributes to failure is clearly
obvious. I'm sure Zenith, in good faith, is studying this to put a
one-time approach or possible modification in place. Today there’s
good FEA mechanical software out there that makes best use of linear
algebra and calculus and it almost casually allows anyone to ask good
questions. I think the answers eventually will suggest a real cause.
Do fly safe,
Larry McFarland 601HDS at www.macsmachine.com
<http://www.macsmachine.com/>
|
| | - The Matronics Zenith-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
