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Jari Kaija
Joined: 23 Feb 2006
Posts: 69
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 Posted: Mon Jun 26, 2006 9:03 am Post subject: CH701 wing strut attachement vs. Savannah accident |
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I'm not sure, If you know this already, but it surely makes me do inspection
hole to my wings!
One year ago (2005) two pilots died in Norway, when Savannah lost
one of it's wing. Savannah uses exactly same kind of wing strut
attachement as CH701 uses and it fails by stress.
There is links for pictures and service instruction:
http://www.ilmailu.org/forum/index.php?action=dlattach;topic=500.0;id=362
http://www.ilmailu.org/forum/index.php?action=dlattach;topic=500.0;id=363
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http://www.jarikaija.com
http://www.project-ch701.net
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john.marzulli(at)gmail.co
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| Posted: Mon Jun 26, 2006 9:59 am Post subject: CH701 wing strut attachement vs. Savannah accident |
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I thought the Savannah did not use jury struts, so even if the main strut connection was the same between the two the amount of stressed placed on the 701's connection would be less... right?
On 6/26/06, Jari Kaija <jari.kaija(at)pp.inet.fi (jari.kaija(at)pp.inet.fi)> wrote:
--
John Marzulli
http://701Builder.blogspot.com/
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Jari Kaija
Joined: 23 Feb 2006
Posts: 69
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| Posted: Mon Jun 26, 2006 10:44 am Post subject: CH701 wing strut attachement vs. Savannah accident |
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> I thought the Savannah did not use jury struts,
Yep. That is right.
> so even if the main strut connection was the same between the two the amount of
> stressed placed on the 701's connection would be less... right?
More or less. Still, jury struts wont help with straight pull and push movement, what
this aluminium "upper strut fitting" have to endure.
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http://www.jarikaija.com
http://www.project-ch701.net
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ihab.awad(at)gmail.com
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| Posted: Mon Jun 26, 2006 11:15 am Post subject: CH701 wing strut attachement vs. Savannah accident |
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On 6/26/06, Jari Kaija <jari.kaija(at)pp.inet.fi> wrote:
| Quote: | More or less. Still, jury struts wont help with straight pull and push
movement, what this aluminium "upper strut fitting" have to endure.
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Yes and no. Could be that the struts are deflecting off axis due to
aero loads (e.g., fluttering about in the slipstream), leading to
fatigue and cracking of that joint.
Ihab
--
Ihab A.B. Awad, Palo Alto, CA
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dougsnash(at)yahoo.com
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| Posted: Mon Jun 26, 2006 12:21 pm Post subject: CH701 wing strut attachement vs. Savannah accident |
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Forgive me if I am overstepping my limits here since I
have never posted to this list before but here goes.
My understanding of the Savannah incident is that the
aircraft in question was stressed during a windstorm.
It had been tied down by the strut attach fitting and
therefore the fitting received the brunt of the forces
from the wind. The owner had replacement parts on
order to repair the aircraft and decided to continue
flying until they arrived. The pictures in the
original post show the catastrophic result.
Again. This is only my understanding and not
necessarily what actually happened.
Chris briefly mentioned this incident at a seminar
last summer at Oshkosh and stated it was not an issue
with the CH-701.
Doug MacDonald
CH-701 scratch builder
NW Ontario, Canada
do not archive
__________________________________________________
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larry(at)macsmachine.com
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| Posted: Mon Jun 26, 2006 1:32 pm Post subject: CH701 wing strut attachement vs. Savannah accident |
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Jari,
Where is the failure specifically? Does it separate at the bolt shown
in the picture, or between bolts not seen below?
Has anyone said?
Larry McFarland - 601HDS
Jari Kaija wrote:
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Jari Kaija
Joined: 23 Feb 2006
Posts: 69
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Jari Kaija
Joined: 23 Feb 2006
Posts: 69
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| Posted: Mon Jun 26, 2006 2:09 pm Post subject: CH701 wing strut attachement vs. Savannah accident |
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| Quote: | Jari,
Where is the failure specifically? Does it separate at the bolt shown in
the picture, or between bolts not seen below?
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It's just before the first bolt (second picture in first www-link). Picture
number
four shows also started cracking on the other wing at the same point.
With my wing skin I can't even see that point good enough. "Stress
corrosion" is
one of the annoying thing to find at early stages (penetration chemicals
helps).
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cffd(at)pgrb.com
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| Posted: Tue Jun 27, 2006 11:20 am Post subject: CH701 wing strut attachement vs. Savannah accident |
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The 701 plans show a rivet between the strut attachment and the angled brace that is attached to the "L" on the wing (this brace without rivet is clearly seen in the referenced picture). This rivet will provide support midway on the strut attachment and keep it from flexing. In fact, the directions on my 701 plans (not SP) and manual have a reminder to specifically put that rivet in. Chris H. must have been aware of the potential failure of the strut attach bracket without the rivet.
Chuck D.
N701TX
[quote] ---
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ggower_99(at)yahoo.com
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| Posted: Thu Jun 29, 2006 9:17 pm Post subject: CH701 wing strut attachement vs. Savannah accident |
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The Savannah is a "pirate" copy, so is not the same design quality as the 701.
Stay with the original always.
No more said.
Saludos
Gary Gower
MacDonald Doug <dougsnash(at)yahoo.com> wrote:
[quote]--> Zenith-List message posted by: MacDonald Doug
Forgive me if I am overstepping my limits here since I
have never posted to this list before but here goes.
My understanding of the Savannah incident is that the
aircraft in question was stressed during a windstorm.
It had been tied down by the strut attach fitting and
therefore the fitting received the brunt of the forces
from the wind. The owner had replacement parts on
order to repair the aircraft and decided to continue
flying until they arrived. The Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls. Great rates starting at 1˘/min.
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