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ihab.awad(at)gmail.com Guest
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Posted: Tue May 06, 2008 7:45 pm Post subject: Another XL Down - Brazil |
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On 5/6/08, Cndmovn <cndmovn(at)gmail.com (cndmovn(at)gmail.com)> wrote: Quote: | Just looked on the Emhart website and the rivets they manufacture are POP brand rivets that according to the website are not specified for aviation, but instead RV's and boats..... |
That in and of itself is not an issue -- it may or may not be a problem. Sonex (and afaik the RV-12, and maybe even also the Rans S-19) use stainless steel Cherry "N" rivets, which seem like basically the same thing as the POP rivets.
I tried to look up the part numbers from the pictured receipt on Google, but found no useful hits. So I can't tell what material the rivets are made from. If the rivets were aluminum body/aluminum mandrel, for example, *that* would be a big issue!
Ihab
--
Ihab A.B. Awad, Palo Alto, CA [quote][b]
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moorecomp
Joined: 14 Aug 2006 Posts: 32
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Posted: Tue May 06, 2008 9:14 pm Post subject: Re: Another XL Down - Brazil |
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All,
With all the questions regarding the materials used, on top of that, take a look at the placard that was on the panel:
http://portal.ucpel.tche.br/py3vhq/home/Zodiac/fotos/20-04-2008/p3280012.jpg
It reads; "Permitted aerobatics basic only. Never exceed +4/-4 G"
-4 G with substandard materials pretty much guarantees a structural failure.
Slippery airframe, sexy look, high time ag pilot, aerobatics, possible substandard materials=2 people dead. Sad day for all.
Best regards,
Craig Moore A&P
Mancelona, MI
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TxDave
Joined: 22 Jul 2006 Posts: 168 Location: Temple, TX
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Posted: Tue May 06, 2008 9:48 pm Post subject: Re: Another XL Down - Brazil |
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Hey Larry M.,
Evidently, Zenith did not consider the modifications inappropriate. Pictures of the AirFox aircraft are featured in the 601XL photo galleries on the ZAC Web site .
http://www.zenithair.com/zodiac/6-photo104.html
Sebastien Heintz himself attended their rudder workshop and took the photos posted on this page:
http://www.zenithair.com/zodiac/6-photo-workshop-brazil.html
As far as the rivets being suspect...if you read the LARGE print on Aircraft Spruce's (or any other supplier's) listing for Avex rivets, you'll see they are considered to be "non-structural".
The first step in solving a problem is to admit that there is a problem. How many people have to die before we admit there just might be a possibility that a problem exists. Notice I said possibility!
Dave Clay
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Andrewlieser
Joined: 15 Mar 2008 Posts: 43 Location: Chicagoland
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Posted: Wed May 07, 2008 3:42 am Post subject: Re: Another XL Down - Brazil |
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Dave, I too am ready to admit there is a POSSIBILITY that there may be something wrong. My logic being that before I decided to build a Zodiac I researched accident data from everywhere I could on many designs (and found that every airplane/manufacturer/designer or experimental) has experienced losses at some point and this I found to be inherent to our hobby. However none of the designs I researched have had fatal accidents reported with what seems to be this alarming of frequency. If the problem is the builder/pilot/materials one would also have to assume that these rogue builders also exist with other manufacturers/designs as well, yet this type of accident frequency does not bear itself in those designs. I hope and pray for the safety of all on this board that this is not the case and that the Zodiac is the airplane we all believe it to be structurally but right now I have to look at this and say hmmmmmm. Just my opinion right now.
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steveadams
Joined: 10 Jan 2006 Posts: 191
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Posted: Wed May 07, 2008 4:17 am Post subject: Re: Another XL Down - Brazil |
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Boy, I must have missed something. Admittedly my Portugese is very rusty, and there's not much to go on, but I didn't see anything about a break-up, and we're already focusing on the aluminum and rivets used in the construction as a cause? Sounds to me like he stalled it in a steep turn, entered a spin, and didn't recover. Perhaps the modifications did have something to do with the stall/spin behavior of the plane, but the rivets???
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William Dominguez
Joined: 09 Apr 2008 Posts: 118
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Posted: Wed May 07, 2008 5:05 am Post subject: Another XL Down - Brazil |
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Very well said Andrew. If you look at other designs with same or higher numbers of planes flying (Sonex, 701, 601HD/S, KR), you don't see not even a single case of wing structural failure. Except with the RVs, but in all cases of RVs wing failures, the NTSB where able to conclude through metallurgical examination that the pilot exceeded maximum gs. There where no "Structural failure of the wing for undetermined reasons". Furthermore, it is my understanding that Vans Aircraft did produce some changes to beef up the wing. It is also my understanding that cases of RVs wing failure hasn't happened since.
I keep building my XL because I'm pretty confident that whatever it is that is causing these accidents, the source of the problem and a solution will be found either by Zenith, NTSB, Independent analysis, a foreign government accident investigation or a mix of these.
William Dominguez
Zodiac 601XL Plans
Miami Florida
http://www.geocities.com/bill_dom
Andrewlieser <Andrewlieser(at)gmail.com> wrote:[quote] --> Zenith-List message posted by: "Andrewlieser"
Dave, I too am ready to admit there is a POSSIBILITY that there may be something wrong. My logic being that before I decided to build a Zodiac I researched accident data from everywhere I could on many designs (and found that every airplane/manufacturer/designer or experimental) has experienced losses at some point and this I found to be inherent to our hobby. However none of the designs I researched have had fatal accidents reported with what seems to be this alarming of frequency. If the problem is the builder/pilot/materials one would also have to assume that these rogue builders also exist with other manufacturers/designs as well, yet this type of accident [quote][b]
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_________________ William Dominguez
Zodiac 601XL Plans
Miami Florida
http://www.geocities.com/bill_dom |
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frankroskind(at)HOTMAIL.C Guest
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Posted: Wed May 07, 2008 5:15 am Post subject: Another XL Down - Brazil |
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All the conjecture about structurl failure seems to ignore the report-The plane seems to have been in a spin or spiral. A spin is not likely to impose high stresses on the structure, although a bad recovery might, but there was no recovery described. A spiral could result in structural failure as the turn tightens, but there was still no report of a failure, and further, the reason for entry to a fatal spiral while in plain view of the ground seems elusive. Given that the plane had entered clouds, it is more likely that the plane entered an inadvertent spin due to disorientation. If any design defect would seem to have a role, it might be the size of the rudder, if the pilot was unable to apply sufficient rudder to exit the spin, but there is little data to support or refute that conjecture. I would point out that the Alarus comes with a bigger rudder for those who would like to spin the plane. None of this is on point for other accidents involving structural failure, except the one in Britain where the pilot entered clouds and exited with a structural failure. There is a simple way to mitigate the potential risk of this kind of accident- don't enter the clouds. Materials seem irrelevant, unless it can be shown that a material failure led to a loss of control.
Quote: | Subject: Re: Another XL Down - Brazil
From: moorecomp(at)yahoo.com
Date: Tue, 6 May 2008 22:14:31 -0700
To: zenith-list(at)matronics.com
--> Zenith-List message posted by: "moorecomp" <moorecomp(at)yahoo.com>
All,
With all the questions regarding the materials used, on top of that, take a look at the placard that was on the panel:
http://portal.ucpel.tche.br/py3vhq/home/Zodiac/fotos/20-04-2008/p3280012.jpg
It reads; "Permitted aerobatics basic only. Never exceed +4/-4 G"
-4 G with substandard materials pretty much guarantees a structural failure.
Slippery airframe, sexy look, high time ag pilot, aerobatics, possible substandard materials=2 people dead. Sad day for all.
Best regards,
Craig Moore A&P
Mancelona, MI
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=181664#181664
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Stay in touch when you're away with Windows Live Messenger. IM anytime you're online. [quote][b]
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William Dominguez
Joined: 09 Apr 2008 Posts: 118
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Posted: Wed May 07, 2008 5:20 am Post subject: Another XL Down - Brazil |
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True, there is no mention of in-flight break-up anywhere so far. But the fact that this was an agricultural pilot with 16K hours of flying experience who could not recover from a spin at 3,500 feet in a plane with recent history of wing failures, seem to have created some suspicion. But as you say, the modifications could have prevented the pilot to recover from the spin.
William Dominguez
Zodiac 601XL Plans
Miami Florida
http://www.geocities.com/bill_dom
steveadams <dr_steve_adams(at)yahoo.com> wrote:[quote] --> Zenith-List message posted by: "steveadams"
Boy, I must have missed something. Admittedly my Portugese is very rusty, and there's not much to go on, but I didn't see anything about a break-up, and we're already focusing on the aluminum and rivets used in the construction as a [quote][b]
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_________________ William Dominguez
Zodiac 601XL Plans
Miami Florida
http://www.geocities.com/bill_dom |
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jmaynard
Joined: 27 Feb 2008 Posts: 394 Location: Fairmont, MN (FRM)
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Posted: Wed May 07, 2008 5:26 am Post subject: Another XL Down - Brazil |
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On Wed, May 07, 2008 at 06:02:33AM -0700, William Dominguez wrote:
Quote: | I keep building my XL because I'm pretty confident that whatever it is
that is causing these accidents, the source of the problem and a solution
will be found either by Zenith, NTSB, Independent analysis, a foreign
government accident investigation or a mix of these.
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This is exactly my thought on the subject. Someone will figure out the
problem, and we'll get a fix - whether that fix is structural, training, or
operational.
--
Jay Maynard, K5ZC http://www.conmicro.com
http://jmaynard.livejournal.com http://www.tronguy.net
Fairmont, MN (FRM) (Yes, that's me!)
AMD Zodiac CH601XLi N55ZC (ordered 17 March, delivery 2 June)
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AMD Zodiac XLi N55ZC |
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carlossa52(at)gmail.com Guest
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Posted: Wed May 07, 2008 5:59 am Post subject: Another XL Down - Brazil |
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None of the reports I've read so far mentions weather.
Carlos
Do not archive
On 5/7/08, Jay Maynard <jmaynard(at)conmicro.com> wrote:
Quote: |
On Wed, May 07, 2008 at 06:02:33AM -0700, William Dominguez wrote:
> I keep building my XL because I'm pretty confident that whatever it is
> that is causing these accidents, the source of the problem and a solution
> will be found either by Zenith, NTSB, Independent analysis, a foreign
> government accident investigation or a mix of these.
This is exactly my thought on the subject. Someone will figure out the
problem, and we'll get a fix - whether that fix is structural, training, or
operational.
--
Jay Maynard, K5ZC http://www.conmicro.com
http://jmaynard.livejournal.com http://www.tronguy.net
Fairmont, MN (FRM) (Yes, that's me!)
AMD Zodiac CH601XLi N55ZC (ordered 17 March, delivery 2 June)
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--
Sent from Gmail for mobile | mobile.google.com
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frankroskind(at)HOTMAIL.C Guest
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Posted: Wed May 07, 2008 6:20 am Post subject: Another XL Down - Brazil |
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My understanding of an early report was that the plane entered a cloud. I have deleted the ppost, so I cannot confirm this.
[quote] Date: Wed, 7 May 2008 07:55:36 -0600
From: carlossa52(at)gmail.com
To: zenith-list(at)matronics.com
Subject: Re: Re: Another XL Down - Brazil
--> Zenith-List message posted by: "Carlos Sa" <carlossa52(at)gmail.com>
None of the reports I've read so far mentions weather.
Carlos
Do not archive
On 5/7/08, Jay Maynard <jmaynard(at)conmicro.com> wrote:
> --> Zenith-List message posted by: Jay Maynard <jmaynard(at)conmicro.com>
>
> On Wed, May 07, 2008 at 06:02:33AM -0700, William Dominguez wrote:
> > I keep building my XL because I'm pretty confident that whatever it is
> > that is causing these accidents, the source of the problem and a solution
> > will be found either by Zenith, NTSB, Independent analysis, a foreign
> > government accident investigation or a mix of these.
>
> This is exactly my thought on the subject. Someone will figure out the
> problem, and we'll get a fix - whether that fix is structural, training, or
> operational.
> --
> Jay Maynard, K5ZC http://www.conmicro.com
> http://jmaynard.livejournal.com http://www.tronguy.net
> Fairmont, MN (FRM) (Yes, that's me!)
> AMD Zodiac CH601XLi N55ZC (ordered 17 March, delivery 2 June)
>
>
>
>
>
--
Sent from Gmail for mo======
With Windows Live for mobile, your contacts travel with you. Connect on the go.
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larry(at)macsmachine.com Guest
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Posted: Wed May 07, 2008 7:03 am Post subject: Another XL Down - Brazil |
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Hi guys,
The website construction pictures of the highly modified 601 show wet
wings that could create weight management problems in flight. The site also
showed flush rivets being installed and filler being used over the wave
created by them. Probably a moot point with regard to the crash, but
the aircraft
was boldly modified with the same enthusiasm of an automobile
customizer. I was impressed with the looks and the speed implied by the
cabin modifications,
but the rest of the components, rudder pivots, cables and linkages could
easily played into this crash if the plane was being flown hard.
Zenith can't police anyone that departs the plans and construction
design details to build a "neat revised version of the 601" and there
were plenty of comments
that this was not a wise thing for them to do, let alone providing
offerings of a "kit with these revisions". What it was about bold
pilots probably applies to bold
builders that depart from the original design.
I'd advocate that you stay safe by keeping faith with the original
Zenith plans and materials. The rivets specified by Zenith may not meet
Aerospace requirements,
but they offer consistency in performance and installation for the design
Larry McFarland 601HDS at www.macsmachine.com
TxDave wrote:
Quote: |
Hey Larry M.,
Evidently, Zenith did not consider the modifications inappropriate. Pictures of the AirFox aircraft are featured in the 601XL photo galleries on the ZAC Web site .
http://www.zenithair.com/zodiac/6-photo104.html
Sebastien Heintz himself attended their rudder workshop and took the photos posted on this page:
http://www.zenithair.com/zodiac/6-photo-workshop-brazil.html
As far as the rivets being suspect...if you read the LARGE print on Aircraft Spruce's (or any other supplier's) listing for Avex rivets, you'll see they are considered to be "non-structural".
The first step in solving a problem is to admit that there is a problem. How many people have to die before we admit there just might be a possibility that a problem exists. Notice I said possibility!
Dave Clay
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=181668#181668
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ashontz
Joined: 27 Dec 2006 Posts: 723
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Posted: Wed May 07, 2008 8:49 am Post subject: Re: Another XL Down - Brazil |
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As far as the structural failure accidents, I'm thinking aileron flutter. Even so, what did Vans do to beef up the RV wings?
[quote="William Dominguez"]Very well said Andrew. If you look at other designs with same or higher numbers of planes flying (Sonex, 701, 601HD/S, KR), you don't see not even a single case of wing structural failure. Except with the RVs, but in all cases of RVs wing failures, the NTSB where able to conclude through metallurgical examination that the pilot exceeded maximum gs. There where no "Structural failure of the wing for undetermined reasons". Furthermore, it is my understanding that Vans Aircraft did produce some changes to beef up the wing. It is also my understanding that cases of RVs wing failure hasn't happened since.
I keep building my XL because I'm pretty confident that whatever it is that is causing these accidents, the source of the problem and a solution will be found either by Zenith, NTSB, Independent analysis, a foreign government accident investigation or a mix of these.
William Dominguez
Zodiac 601XL Plans
Miami Florida
http://www.geocities.com/bill_dom
Andrewlieser <Andrewlieser> wrote:[quote] --> Zenith-List message posted by: "Andrewlieser"
Dave, I too am ready to admit there is a POSSIBILITY that there may be something wrong. My logic being that before I decided to build a Zodiac I researched accident data from everywhere I could on many designs (and found that every airplane/manufacturer/designer or experimental) has experienced losses at some point and this I found to be inherent to our hobby. However none of the designs I researched have had fatal accidents reported with what seems to be this alarming of frequency. If the problem is the builder/pilot/materials one would also have to assume that these rogue builders also exist with other manufacturers/designs as well, yet this type of accident
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William Dominguez
Joined: 09 Apr 2008 Posts: 118
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Posted: Wed May 07, 2008 9:46 am Post subject: Another XL Down - Brazil |
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I'm not familiar with the details, but it was mentioned by a poster of this list a while back. Do a search for "wing failure" in the RV list for some discussions.
William Dominguez
Zodiac 601XL Plans
Miami Florida
http://www.geocities.com/bill_dom
ashontz <ashontz(at)nbme.org> wrote:[quote] --> Zenith-List message posted by: "ashontz"
As far as the structural failure accidents, I'm thinking aileron flutter. Even so, what did Vans do to beef up the RV wings?
[quote="William Dominguez"]Very well said Andrew. If you look at other designs with same or higher numbers of planes flying (Sonex, 701, 601HD/S, KR), you don't see not even a single case of wing structural failure. Except with the RVs, but in all cases of RVs wing failures, the NTSB where able to conclude through metallurgical examination that the pilot exceeded maximum gs. There where no "Structural failure of the wing for undetermined reasons". Furthermore, it is my understanding that Vans Aircraft did produce some changes to beef up the wing. It is also my understanding that cases of RVs wing failure hasn't happened since.
I keep building my XL because I'm pretty confident that whatever it is that is causing these accidents, the source of the problem and a solution will be found either by Zenith, NTSB, Independent analysis, a foreign government accident investigation or a mix of these.
William Dominguez
Zodiac 601XL Plans
Miami Florida
http://www.geocities.com/bill_dom
Andrewlieser wrote:[quote] --> Zenith-List message posted by: "Andrewlieser"
Dave, I too am ready to admit there is a POSSIBILITY that there may be something wrong. My logic being that before I decided to build a Zodiac I researched accident data from everywhere I could on many designs (and [quote][b]
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_________________ William Dominguez
Zodiac 601XL Plans
Miami Florida
http://www.geocities.com/bill_dom |
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PatrickW
Joined: 27 Oct 2006 Posts: 380 Location: Fort Worth, Texas
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Posted: Wed May 07, 2008 9:53 am Post subject: Re: Another XL Down - Brazil |
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William Dominguez wrote: | I'm pretty confident that whatever it is that is causing these accidents, the source of the problem and a solution will be found either by Zenith, NTSB, Independent analysis, a foreign government accident investigation or a mix of these. |
We shouldn't hold out much hope for any of these groups finding a solution, with the possible exception of Zenith. I would hope that they would be free to communicate any findings without fear of legal backlash, instead of keeping mum. We builders are as likely as anyone to figure out what's happening.
It's only a matter of time before somebody with a BRS actually survives a structural failure and then is able to give a first hand account of what happened. With the summer flying season upon us, I think we'll have a few more data points by the time Oshkosh rolls around. Survivable data points, I pray...
William Dominguez wrote: | Furthermore, it is my understanding that Vans Aircraft did produce some changes to beef up the wing. It is also my understanding that cases of RVs wing failure hasn't happened since. |
Does anyone know what those changes were? How did the "old" Van's wing compare with the current Zodiac XL wing...?
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Iberplanes
Joined: 10 Dec 2007 Posts: 174 Location: Igualada - Barcelona - Spain
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Posted: Wed May 07, 2008 10:30 am Post subject: Another XL Down - Brazil |
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was not installed. I have confirmed this today on a direct email to a Brazilian friend.
[quote] ---
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_________________ Alberto Martin
601 XL - Jabiru 3300
http://www.iberplanes.es
Igualada - Barcelona - Spain |
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Iberplanes
Joined: 10 Dec 2007 Posts: 174 Location: Igualada - Barcelona - Spain
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Posted: Wed May 07, 2008 10:36 am Post subject: Another XL Down - Brazil |
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no clouds were on the comments I´ve read.
Alberto Martin
Iberplanes IGL
http://www.iberplanes.es
Igualada - Barcelona - Espaņa
[quote] ---
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601 XL - Jabiru 3300
http://www.iberplanes.es
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Andrewlieser
Joined: 15 Mar 2008 Posts: 43 Location: Chicagoland
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Posted: Wed May 07, 2008 10:40 am Post subject: Re: Another XL Down - Brazil |
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I've been looking around the internet here because I to would be interested to know what Vans did to beef up there wing and found an old RV-3 accident report that was actually quite thorough and it relates to a sequence of wing failures they had with the RV-3 at that time and the integrity of Vans to recognize these failures as result in part because of the design as well as provide a solution (I believe CH would do exactly the same if there is a flaw discovered). Here is the link if anyone is interested:
http://www.ntsb.gov/ntsb/brief2.asp?ev_id=20001211X09658&ntsbno=FTW98FA145&akey=1
Also let me preface this by saying "I am not suggesting anything" and "this is purely just for comparison" but I found it interesting that the new RV-12 wing has 13 ribs per wing, more than the Zodiac XL yet they have very similar specs (XL wing span 27 ft, RV-12 is 26'8ft / XL wing area 132 SQF, RV'12 is 127SQF, XL wing loading is 9.85 lbs psf, RV-12 is 10.4 lbs psf). Again this is just for comparison and my own inquizitive mind that is all.
Of all this I do believe that the folks at Zenith will figure this out and I too will continue to build.
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_________________ Andrew Lieser
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Andrewlieser
Joined: 15 Mar 2008 Posts: 43 Location: Chicagoland
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n801bh(at)netzero.com Guest
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Posted: Wed May 07, 2008 10:45 am Post subject: Another XL Down - Brazil |
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I didn't see the "entered a cloud" in any of the translations. That comment came from one poster and where he dug that up is beyond me.
do not archive
Ben Haas
N801BH
www.haaspowerair.com
-- Frank Roskind <frankroskind(at)HOTMAIL.COM> wrote:
All the conjecture about structurl failure seems to ignore the report-The plane seems to have been in a spin or spiral. A spin is not likely to impose high stresses on the structure, although a bad recovery might, but there was no recovery described. A spiral could result in structural failure as the turn tightens, but there was still no report of a failure, and further, the reason for entry to a fatal spiral while in plain view of the ground seems elusive. Given that the plane had entered clouds, it is more likely that the plane entered an inadvertent spin due to disorientation. If any design defect would seem to have a role, it might be the size of the rudder, if the pilot was unable to apply sufficient rudder to exit the spin, but there is little data to support or refute that conjecture. I would point out that the Alarus comes with a bigger rudder for those who would like to spin the plane. None of this is on point for other accidents involving structural failure, except the one in Britain where the pilot entered clouds and exited with a structural failure. There is a simple way to mitigate the potential risk of this kind of accident- don't enter the clouds. Materials seem irrelevant, unless it can be shown that a material failure led to a loss of control.
Quote: | Subject: Zenith-List: Re: Another XL Down - Brazil
From: moorecomp(at)yahoo.com
Date: Tue, 6 May 2008 22:14:31 -0700
To: zenith-list(at)matronics.com
--> Zenith-List message posted by: "moorecomp" <moorecomp(at)yahoo.com>
All,
With all the questions regarding the materials used, on top of that, take a look at the placard that was on the panel:
http://portal.ucpel.tche.br/py3vhq/home/Zodiac/fotos/20-04-2008/p3280012.jpg
It reads; "Permitted aerobatics basic only. Never exceed +4/-4 G"
-4 G with substandard materials pretty much guarantees a structural failure.
Slippery airframe, sexy look, high time ag pilot, aerobatics, possible substandard materials=2 people dead. Sad day for all.
Best regards,
Craig Moore A&P
Mancelona, MI
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=181664#181664
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