larry(at)macsmachine.com
Guest
|
 Posted: Sun Jun 14, 2009 4:55 pm Post subject: [Probable Spam] Re: Re: I got Zbagged three times on Friday |
 |
|
Hi Dave,
I've commented that the flutter was an unlikely problem for the XLs that
failed. Aside from overloading, mishandling or workmanship, the one
significant change from HD and HDS series design was the longer, thinner
wing and center section that is the shorter focal point for the leverage
of the longer wing. Same fuel loading, baggage, people and engines.
Photos of the damaged parts suggest to me that the failure occurs in the
center section. You only have to count the frequency of fractures and
cracks in the center spar to realize the problem is focused in that
area. The wings are beat up from impact, but the cracks, fractures and
failure of the center spar show an intense concentration of stresses
there before and after impact with the ground.
The numbers prove the center spar is adequate for the designed loads,
but beyond the safety factor, fatigue and an overly responsive elevator
can easily rewrite this equation.
I’d hope too that they are looking at each aircraft's time of
construction, process and design evolution and Airworthiness date.
Something will eventually be discovered that’s specifically relevant.
I began my HDS 1998-9, just before the first updated plans for the XL
were available, or I'd certainly have built the XL for its speed and
flaps etc. Given hindsight of the recent year, I 'd still have gone with
the XL as it's a very capable, modern design. Time will show the XL to
be an aircraft that can be safely flown for thousands of hours over many
years if it’s constructed properly and religiously flown within its
design envelope.
I’d recommend you continue to fly and observe the common sense rules for
your 601XLs and enjoy the benefits before TSA and the “nanny politicos”
take over to protect us from ourselves.
Do fly safe, respectfully,
Larry McFarland 601HDS at www.macsmachine.com
Dave wrote:
| Quote: | Instead of ranting and raving, and launcing ad hominem attacks on
individuals who's reaction to concerns about safety is different than
yours. Why don't you resort to the only truth we know so far.
No known cause of structural failures has thus far been determined,
and all tests so far conducted have revealed no significant
shortcomings in the design.
Any belief that the airframe IS without fault is simply conjecture, as
is the belief that there is a major fault.
*
*
|
| | - 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
