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dogsbark(at)comcast.net Guest
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Posted: Fri Nov 28, 2008 9:11 pm Post subject: Delamination |
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Okay composite experts....I need your help, please.
I just got the engine cowl fit to the plane after many hours of work. Much to my disappointment, I noticed a "crunching" noise in a few spots on the upper cowl if I leaned on them. A total of four handsized areas are delaminating. There are other small areas as well. There is no deformation inside or out, but a clear void is there. The honeycomb is not visible in these areas when looking from the outside. Also, there is a small dab of filler on one of the voids that was there when I received the cowl.
Pictures are at: http://websites.expercraft.com/seanb/index.php?q=log_entry&log_id=32934 If you double click the photos, you can get a closer look at the detail.
I have zero experience with composites. Is there a solution to this that's feasible? Can I inject epoxy into the voids and work it around to fill them? Or, do I need to remove these areas down to the substrate and then build them back up? How much of a structural issue could this be?
Of course I don't want to start over. Anything reasonable is worth trying.
Thanks for any help or recommendations.
Sean Blair
#40225
[quote][b]
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Dave(at)AirCraftersLLC.co Guest
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Posted: Fri Nov 28, 2008 10:55 pm Post subject: Delamination |
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Sean,
Give me a call (# below). The things you mentioned are feasible, but might not be necessary.
Dave Saylor
AirCrafters LLC
140 Aviation Way
Watsonville, CA
831-750-0284 CL
www.AirCraftersLLC.com
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of dogsbark(at)comcast.net
Sent: Friday, November 28, 2008 9:09 PM
To: rv10-list(at)matronics.com
Subject: RV10-List: Delamination
Okay composite experts....I need your help, please.
I just got the engine cowl fit to the plane after many hours of work. Much to my disappointment, I noticed a "crunching" noise in a few spots on the upper cowl if I leaned on them. A total of four handsized areas are delaminating. There are other small areas as well. There is no deformation inside or out, but a clear void is there. The honeycomb is not visible in these areas when looking from the outside. Also, there is a small dab of filler on one of the voids that was there when I received the cowl.
Pictures are at: http://websites.expercraft.com/seanb/index.php?q=log_entry&log_id=32934 If you double click the photos, you can get a closer look at the detail.
I have zero experience with composites. Is there a solution to this that's feasible? Can I inject epoxy into the voids and work it around to fill them? Or, do I need to remove these areas down to the substrate and then build them back up? How much of a structural issue could this be?
Of course I don't want to start over. Anything reasonable is worth trying.
Thanks for any help or recommendations.
Sean Blair
#40225
[quote]
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
href='3D"http://www.matronics.com/contribution"'>http://www.matronics.com/contribution
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
href='3D"http://www.matronics.com/Navigator?RV10-List"'>http://www.matronics.com/Navigator?RV10-List
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
href='3D"http://forums.matronics.com"'>http://forums.matronics.com
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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indigoonlatigo(at)msn.com Guest
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Posted: Sun Nov 30, 2008 8:03 am Post subject: Delamination |
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Delamination suggests that it was at one time laminated and became delaminated. I would disagree C these areas in the pictures look as though they where never laminated. Looks as though the vacuum did not pull the honeycomb down onto the outside skin.
This is a quality control issue and IMOO should have never been received by Van's from their fabricator let alone sent on to you from Vans.
Thanks for the pictures C it will give others what to look for before starting in on a fiberglass part.
JOhn Gonzalez
Date: Sat C 29 Nov 2008 05:08:57 +0000
From: dogsbark(at)comcast.net
To: rv10-list(at)matronics.com
Subject: Delamination
.ExternalClass p {;}
Okay composite experts....I need your help C please.
I just got the engine cowl fit to the plane after many hours of work. Much to my disappointment C I noticed a "crunching" noise in a few spots on the upper cowl if I leaned on them. A total of four handsized areas are delaminating. There are other small areas as well. There is no deformation inside or out C but a clear void is there. The honeycomb is not visible in these areas when looking from the outside. Also C there is a small dab of filler on one of the voids that was there when I received the cowl.
Pictures are at: http://websites.expercraft.com/seanb/index.php?q=log_entry&log_id=32934 If you double click the photos C you can get a closer look at the detail.
I have zero experience with composites. Is there a solution to this that's feasible? Can I inject epoxy into the voids and work it around to fill them? Or C do I need to remove these areas down to the substrate and then build them back up? How much of a structural issue could this be?
Of course I don't want to start over. Anything reasonable is worth trying.
Thanks for any help or recommendations.
Sean Blair
#40225
[quote]
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
[b]
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AirMike
Joined: 27 Feb 2007 Posts: 514 Location: Nevada
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Posted: Sun Nov 30, 2008 8:11 am Post subject: Delamination |
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I would request a replacement from Vans. They are usually quite good about things like this, and even if you get it "fixed" it may delaminate further in the near future necessitating a replacement. This could be quite costly and now you have a template. What is your build number so that those in the same group can check theirs??
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n801bh(at)netzero.com Guest
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Posted: Sun Nov 30, 2008 12:23 pm Post subject: Delamination |
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I agree with John on this completly. Vans should have examined this as they received it from their vendor and for sure not shipped it to the end user. From the pics it looks like Sean has spent alot of time fitting the whole assembly nicely. Even if Vans does replace it Sean has hours and hours of rework time. Not what a homebuilder looks forward to.
do not archive
Ben Haas
N801BH
www.haaspowerair.com
-- John Gonzalez <indigoonlatigo(at)msn.com> wrote:
Delamination suggests that it was at one time laminated and became delaminated. I would disagree, these areas in the pictures look as though they where never laminated. Looks as though the vacuum did not pull the honeycomb down onto the outside skin.
This is a quality control issue and IMOO should have never been received by Van's from their fabricator let alone sent on to you from Vans.
Thanks for the pictures, it will give others what to look for before starting in on a fiberglass part.
JOhn Gonzalez
Date: Sat, 29 Nov 2008 05:08:57 +0000
From: dogsbark(at)comcast.net
To: rv10-list(at)matronics.com
Subject: Delamination
Okay composite experts....I need your help, please.
I just got the engine cowl fit to the plane after many hours of work. Much to my disappointment, I noticed a "crunching" noise in a few spots on the upper cowl if I leaned on them. A total of four handsized areas are delaminating. There are other small areas as well. There is no deformation inside or out, but a clear void is there. The honeycomb is not visible in these areas when looking from the outside. Also, there is a small dab of filler on one of the voids that was there when I received the cowl.
Pictures are at: http://websites.expercraft.com/seanb/index.php?q=log_entry&log_id=32934 If you double click the photos, you can get a closer look at the detail.
I have zero experience with composites. Is there a solution to this that's feasible? Can I inject epoxy into the voids and work it around to fill them? Or, do I need to remove these areas down to the substrate and then build them back up? How much of a structural issue could this be?
Of course I don't want to start over. Anything reasonable is worth trying.
Thanks for any help or recommendations.
Sean Blair
#40225
Quote: |
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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AV8ORJWC
Joined: 13 Jul 2006 Posts: 1149 Location: Aurora, Oregon "Home of VANS"
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Posted: Sun Nov 30, 2008 12:46 pm Post subject: Delamination |
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Visual inspection of all VAN parts is SOP along with inventory of received goods. Tap Testing of composite parts is a wise idea. If you need directions, on how to Tap Test, write me and I will forward the process. The old Blue/Green composite material is far different from the newer pink panther version two . All builders should look at their First Generation Blue/Green components to make sure they do not have production DELAM. The Second Generation Pink production parts seem to have a slight improved product, mold and final finish.
I can feel Sean's pain. Thank goodness it was not found after the final topcoat was applied.
John C
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of n801bh(at)netzero.com
Sent: Sunday, November 30, 2008 12:20 PM
To: rv10-list(at)matronics.com
Subject: RE: Delamination
I agree with John on this completly. Vans should have examined this as they received it from their vendor and for sure not shipped it to the end user. From the pics it looks like Sean has spent alot of time fitting the whole assembly nicely. Even if Vans does replace it Sean has hours and hours of rework time. Not what a homebuilder looks forward to..
do not archive
Ben Haas
N801BH
www.haaspowerair.com
-- John Gonzalez <indigoonlatigo(at)msn.com> wrote:
Delamination suggests that it was at one time laminated and became delaminated. I would disagree, these areas in the pictures look as though they where never laminated. Looks as though the vacuum did not pull the honeycomb down onto the outside skin.
This is a quality control issue and IMOO should have never been received by Van's from their fabricator let alone sent on to you from Vans.
Thanks for the pictures, it will give others what to look for before starting in on a fiberglass part.
JOhn Gonzalez
Date: Sat, 29 Nov 2008 05:08:57 +0000
From: dogsbark(at)comcast.net
To: rv10-list(at)matronics.com
Subject: Delamination
Okay composite experts....I need your help, please.
I just got the engine cowl fit to the plane after many hours of work. Much to my disappointment, I noticed a "crunching" noise in a few spots on the upper cowl if I leaned on them. A total of four handsized areas are delaminating. There are other small areas as well. There is no deformation inside or out, but a clear void is there. The honeycomb is not visible in these areas when looking from the outside. Also, there is a small dab of filler on one of the voids that was there when I received the cowl.
Pictures are at: http://websites.expercraft.com/seanb/index.php?q=log_entry&log_id=32934 If you double click the photos, you can get a closer look at the detail.
I have zero experience with composites. Is there a solution to this that's feasible? Can I inject epoxy into the voids and work it around to fill them? Or, do I need to remove these areas down to the substrate and then build them back up? How much of a structural issue could this be?
Of course I don't want to start over. Anything reasonable is worth trying.
Thanks for any help or recommendations.
Sean Blair
#40225
[quote] [b]
| - The Matronics RV10-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?RV10-List |
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kearney
Joined: 20 Sep 2008 Posts: 563
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Posted: Sun Nov 30, 2008 1:55 pm Post subject: Delamination |
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Hi John
Would you post the “tap test” instructions? It would be a good thing to have in the archive.
Cheers
Les
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of John Cox
Sent: November-30-08 1:44 PM
To: rv10-list(at)matronics.com
Subject: RE: RV10-List: Delamination
Visual inspection of all VAN parts is SOP along with inventory of received goods. Tap Testing of composite parts is a wise idea. If you need directions, on how to Tap Test, write me and I will forward the process. The old Blue/Green composite material is far different from the newer pink panther version two . All builders should look at their First Generation Blue/Green components to make sure they do not have production DELAM. The Second Generation Pink production parts seem to have a slight improved product, mold and final finish.
I can feel Sean's pain. Thank goodness it was not found after the final topcoat was applied.
John C
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of n801bh(at)netzero.com
Sent: Sunday, November 30, 2008 12:20 PM
To: rv10-list(at)matronics.com
Subject: RE: RV10-List: Delamination
I agree with John on this completly. Vans should have examined this as they received it from their vendor and for sure not shipped it to the end user. From the pics it looks like Sean has spent alot of time fitting the whole assembly nicely. Even if Vans does replace it Sean has hours and hours of rework time. Not what a homebuilder looks forward to..
do not archive
Ben Haas
N801BH
www.haaspowerair.com
-- John Gonzalez <indigoonlatigo(at)msn.com> wrote:
Delamination suggests that it was at one time laminated and became delaminated. I would disagree, these areas in the pictures look as though they where never laminated. Looks as though the vacuum did not pull the honeycomb down onto the outside skin.
This is a quality control issue and IMOO should have never been received by Van's from their fabricator let alone sent on to you from Vans.
Thanks for the pictures, it will give others what to look for before starting in on a fiberglass part.
JOhn Gonzalez
Date: Sat, 29 Nov 2008 05:08:57 +0000
From: dogsbark(at)comcast.net
To: rv10-list(at)matronics.com
Subject: Delamination
Okay composite experts....I need your help, please.
I just got the engine cowl fit to the plane after many hours of work. Much to my disappointment, I noticed a "crunching" noise in a few spots on the upper cowl if I leaned on them. A total of four handsized areas are delaminating. There are other small areas as well. There is no deformation inside or out, but a clear void is there. The honeycomb is not visible in these areas when looking from the outside. Also, there is a small dab of filler on one of the voids that was there when I received the cowl.
Pictures are at: http://websites.expercraft.com/seanb/index.php?q=log_entry&log_id=32934 If you double click the photos, you can get a closer look at the detail.
I have zero experience with composites. Is there a solution to this that's feasible? Can I inject epoxy into the voids and work it around to fill them? Or, do I need to remove these areas down to the substrate and then build them back up? How much of a structural issue could this be?
Of course I don't want to start over. Anything reasonable is worth trying.
Thanks for any help or recommendations.
Sean Blair
#40225
012345678901234
[quote][b]
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dogsbark(at)comcast.net Guest
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Posted: Sun Nov 30, 2008 3:24 pm Post subject: Delamination |
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Hey everyone,
Thanks so much for the assistance both on the phone and through the list. Your efforts are appreciated.
I will lean toward a replacement cowl. For now, I think just the top....but I wonder if there may be thickness differences or any other tollerence issues mating the green and the pink halves together. Did Van's change vendors altogether? M&W does the green one I have.
I agree with John Gonzalez's thought of the problem occurring during production. It seems not enough vacuum was present to make all areas establish proper contact and remove all voids. There is no deformation though. Only the exterior displays this degree of seperation. It's still puzzling to me that there is a nickel size area of filler directly above one of the largest voids.
My build number is 40225. I purchased the entire airframe, with finish kit, within a year of my start date of May 2004. John Cox's advise of visual inspection of all parts being SOP prior to construction is a good idea. I've been fairly good about this....I guess not this time.
Well....I'll move on from here. Does anyone know where I can get pink microbaloons in case the second one doesn't turn out as well?
Thanks again everyone!
Sean Blair
#40225
Colorado Springs...snowing
---
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AV8ORJWC
Joined: 13 Jul 2006 Posts: 1149 Location: Aurora, Oregon "Home of VANS"
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Posted: Sun Nov 30, 2008 4:14 pm Post subject: Delamination |
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I am at work till 0700Z. A quick look in the AC43.13 that you all have handy on the workbench shows the passage as Section 8 "Tap Testing" and listed as paragraph 5-105 to be found on page 5-53. The document is available on the web for those that don't like the 8 pound tree trunk sitting around.
I will cut and paste into a PDF file unless someone beats me to it.
Caveat - I have seen tapping so strong handed that the simple US quarter can leave dents into the outer substrate. Learn to Lightly tap on a good area to establish the acoustic ring. Move to the offending area and you will never forget a void, defect, water or other occlusion.
Good Luck
From: owner-rv10-list-server(at)matronics.com on behalf of dogsbark(at)comcast.net
Sent: Sun 11/30/2008 3:23 PM
To: rv10-list(at)matronics.com
Subject: Re: Delamination
Hey everyone,
Thanks so much for the assistance both on the phone and through the list. Your efforts are appreciated.
I will lean toward a replacement cowl. For now, I think just the top....but I wonder if there may be thickness differences or any other tollerence issues mating the green and the pink halves together. Did Van's change vendors altogether? M&W does the green one I have.
I agree with John Gonzalez's thought of the problem occurring during production. It seems not enough vacuum was present to make all areas establish proper contact and remove all voids. There is no deformation though. Only the exterior displays this degree of seperation. It's still puzzling to me that there is a nickel size area of filler directly above one of the largest voids.
My build number is 40225. I purchased the entire airframe, with finish kit, within a year of my start date of May 2004. John Cox's advise of visual inspection of all parts being SOP prior to construction is a good idea. I've been fairly good about this....I guess not this time.
Well....I'll move on from here. Does anyone know where I can get pink microbaloons in case the second one doesn't turn out as well?
Thanks again everyone!
Sean Blair
#40225
Colorado Springs...snowing
---
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AV8ORJWC
Joined: 13 Jul 2006 Posts: 1149 Location: Aurora, Oregon "Home of VANS"
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Posted: Sun Nov 30, 2008 11:24 pm Post subject: Delamination |
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For those who do not sleep and eat with the AC43.13 next to their bed or table:
Our Qualification Test for NDI or NDT, had the applicant tap test a sample of composite honeycomb about 8" x 6" x 0.6250" and identify the various pitch changes. This included an area of resin rich, resin lean, delaminations like in Sean's cowl, a potted stainless insert and an area of crush damage to the honeycomb underlayment. The applicant could not see the underside until after marking with a grease pencil the virgin topside for scoring. Abarus in Nevada is the best in the West for Professional Composite Training at a high price tag.
In actual practice we are looking in the field for delamination, moisture penetration and separation of differing materials. One of the big challenges was a void in the adhesion of Nickel Sheathing on the leading edge of Composite propeller blades. Another was significant water infiltration through the porosity of natural topcoat epoxy paint under the engine area. We are now using Thermography and Acoustic Ultrasound techniques to find errant moisture. Sorry to those of you who are bored with such things.
For the rest of the RV-10 community, a careful study of Sean's great pictures is enough to drive home the potential of exterior BID separation from honeycomb. If in Northern California, sign up for Dave Saylor's next class and "Press to Test" on the subject. This is a big help in composite products.
John Cox
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Les Kearney
Sent: Sunday, November 30, 2008 1:54 PM
To: rv10-list(at)matronics.com
Subject: RE: Delamination
Hi John
Would you post the “tap test” instructions? It would be a good thing to have in the archive.
Cheers
Les
Pictures are at: http://websites.expercraft.com/seanb/index.php?q=log_entry&log_id=32934
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AC43.13-1B_Tap_Testing.pdf |
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AC43.13-1B_Laminate_Repairs_of_Fiberglass.pdf |
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