 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
Craymondw(at)aol.com
Guest
|
 Posted: Tue Dec 14, 2010 8:48 am Post subject: Glasair spars |
 |
|
I just read a report about a wing skin on a Cessna Columbia "disbonding seven feet during a production acceptance flight test." The FAA is issuing an AD and looking into if "unsafe condition is likely to exist in other products of the same type of design." As I was building my Glasair I needed to disbond my rudder skins because of a mistake I made and was surprised how easily they came apart and hoped my wing skins would fair better. I had a friend that manufactured glass sail boats help me and he sanded my spars and wing skins with 80 grit paper and washed them with acetone before laminating them together. During the construction he would comment on the parts and would ask in his thick German accent; ""Vat did Glasair design..a tank?!!" When I incorrectly laminated a foot long fiber glass right angle to the inside of a fuselage skin I at first tried to pop it off using a hammer and chisel and couldn't and ended spending a long time sawing it off with a hack saw blade. Four years later when my nose gear sheared off the plane as I was landing on a sandy soil threshold causing my right wing dug into the ground and cart wheeling the plane. My concern was disbonding of the wing skins. I tapped the entire length of the spar with a coin and couldn't detect any disbonding. My German fiberglass expert friend advised that if my skins hadn't rippled there wouldn't be any disbonding. All of my damage was at the point of contact. My G-Meter was pegged at 14G's and I couldn't decide if the wing actually stood 14 G's or if that was the shock of the nose digging into the ground. Bob Heredeen pulled very high G's in both his Glasair 2 and 3 for years. Also Glasair uses a different resin than Lancair that may be stronger. I completed my plane in the spring of 1991 and had the nose wheel assembly part company in 1996. After I repaired my plane I pulled my chute from my Pitt's S1S and flew up to 6,000 feet and did aerobatics to test my wings and pulled close to six G's. I never bailed out of a plane before and hoped I wouldn't have to. I would also add that there has never been an in flight structural failure of a Glasair. My hope is that the FAA doesn't jump the gun and issue an AD on Glasair's and that they first contact the company and retrieve some data.
[quote][b]
| | - The Matronics Glasair-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?Glasair-List |
|
|
|
| Back to top |
|
 |
bgray(at)glasair.org
Guest
|
| Posted: Thu Dec 16, 2010 6:16 am Post subject: Glasair spars |
|
|
Actually, there has been a structural failure of a Glasair III. It was similar to the Columbia incident. Chip Beck was flying his GIII at an airshow, during his acro routine he experienced a wing skin/spar delamination. Fuel was sloshing all over. He said he was pulling about 9 G’s at the time. The wing was originally closed by Phoenix Composites using a non-standard closing method and material.
Bruce
www.Glasair.org
--
| | - The Matronics Glasair-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?Glasair-List |
|
|
|
| Back to top |
|
|
keepertoad(at)bellsouth.n
Guest
|
| Posted: Thu Dec 16, 2010 9:50 am Post subject: Glasair spars |
|
|
On Thu, 2010-12-16 at 09:13 -0500, Bruce Gray wrote:
| Quote: | The wing was originally closed by Phoenix Composites using a non-standard closing method and material.
|
Would you elaborate on this a little. What exactly was the "method" and "materials". Thanks in advance.
B.J. McClure
Glasair III N300JJ
Thu Dec 16 12:44:20 EST 2010, RHEL 6, Linux 2.6.32-71.7.1.el6.x86_64 x86_64
| | - The Matronics Glasair-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?Glasair-List |
|
|
|
| Back to top |
|
|
bgray(at)glasair.org
Guest
|
| Posted: Thu Dec 16, 2010 10:35 am Post subject: Glasair spars |
|
|
>From what I’ve been told is that they used a mixture of resin, mill fiber, and cabosil. Cabosil in high strength bonds is a no-no. All it does is weaken the bond.
Bruce
www.Glasair.org
--
| | - The Matronics Glasair-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?Glasair-List |
|
|
|
| Back to top |
|
|
Craymondw(at)aol.com
Guest
|
| Posted: Thu Dec 16, 2010 10:53 am Post subject: Glasair spars |
|
|
Know your materials and in critical areas follow the manual. In a message dated 12/16/2010 1:36:08 P.M. Eastern Standard Time, bgray(at)glasair.org writes:
| Quote: |
>From what Iāve been told is that they used a mixture of resin, mill fiber, and cabosil. Cabosil in high strength bonds is a no-no. All it does is weaken the bond.
Bruce
www.Glasair.org
-----Original Message-----
From: owner-glasair-list-server(at)matronics.com [mailto:owner-glasair-list-server(at)matronics.com] On Behalf Of B.J. McClure
Sent: Thursday, December 16, 2010 12:47 PM
To: glasair-list(at)matronics.com
Subject: RE: Glasair-List: Glasair spars
On Thu, 2010-12-16 at 09:13 -0500, Bruce Gray wrote:
The wing was originally closed by Phoenix Composites using a non-standard closing method and material.
Would you elaborate on this a little. What exactly was the "method" and "materials". Thanks in advance.
B.J. McClure
Glasair III N300JJ
Thu Dec 16 12:44:20 EST 2010, RHEL 6, Linux 2.6.32-71.7.1.el6.x86_64 x86_64
|
[quote][b]
| | - The Matronics Glasair-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?Glasair-List |
|
|
|
| Back to top |
|
|
keepertoad(at)bellsouth.n
Guest
|
| Posted: Thu Dec 16, 2010 11:04 am Post subject: Glasair spars |
|
|
Thanks. Appreciate the info.
On Thu, 2010-12-16 at 13:24 -0500, Bruce Gray wrote: [quote] >From what I’ve been told is that they used a mixture of resin, mill fiber, and cabosil. Cabosil in high strength bonds is a no-no. All it does is weaken the bond.
Bruce
www.Glasair.org
--
| | - The Matronics Glasair-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?Glasair-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
