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ddddsp1(at)juno.com
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 Posted: Wed Sep 20, 2006 9:08 pm Post subject: Carbon Fiber tape |
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I was discussing HOW to put the windows in the rV 10 with a guy currently building a Lancair IV retract/pressurized. He suggested putting 1 1/2 inch wide Carbon Fiber tape over the window edges to help prevent them from cracking. He also said he would put it over the seam between the cabin cover and fuselage and the cabin cover and empenage. Does any one have experience with Carbon tape? I knwo West Systems sells some that is compatitble with their epoxy. Would this be a good idea? What has everbody used to fill in the seam between the cabin cover and fuselage/empenage? I think Microballoons would eventually crack in these areas. VIC.........are you seeing any stress cracks on your plane? What did you use in these areas?
Thanks,
DEAN
40449 Cowling/Baffling
________________________________________________________________________
Visit http://www.juno.com/value to sign up today!
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dlm46007(at)cox.net
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| Posted: Wed Sep 20, 2006 9:24 pm Post subject: Carbon Fiber tape |
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Far better to use fiberglass (see my previous posting) especially where the tape would be put over aluminum. Carbon fiber on alumiuium is corrosive.
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AV8ORJWC
Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"
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| Posted: Wed Sep 20, 2006 10:49 pm Post subject: Carbon Fiber tape |
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Use of Carbon and Fiberglas combinations should not be used without clear knowledge of the final result. It will not be as intended. Carbon fiber should always be covered with impregnated fiberglass cloth so that #1, no contact is made with other galvanic materials and #2 there is a sacrificial layer for sanding. If you need the nobility list, let me know offline. The resultant carbon fibers are a bitch to get primed for final paint. The carbon strips used on the canopy and doors of the RV-10 were stiffeners specifically spec’ed by Composites Unlimited (and safely buried underneath glass). Andy Marshall’s book warns of the un-intended consequences.
Dozens of Lancairs have suffered polyester filler collapse and fillet failure with the use of microballoons as a structural matrix. They used it cause it was easier to sand at the time. The alternative made them whine during construction. It takes 12 to 18 months after final topcoat to bitch slap you along the head. ( Pictures available on request). This phenomena is not make nor model specific. Pressurized structures bring a whole new dynamic to the stresses.
- Turban twists on tight -.
John #600
Do not Archive
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of David McNeill
Sent: Wednesday, September 20, 2006 10:23 PM
To: rv10-list(at)matronics.com; claude.r.burgin(at)boeing.com
Subject: Re: Carbon Fiber tape
Far better to use fiberglass (see my previous posting) especially where the tape would be put over aluminum. Carbon fiber on alumiuium is corrosive.
[quote]
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Dave(at)AirCraftersLLC.co
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| Posted: Thu Sep 21, 2006 12:47 pm Post subject: Carbon Fiber tape |
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Carbon tape would be a bit of overkill since it isn't really doing anything structural. IV-P windows have to hold back a lot of pressure. One layer of this P/N from Aircraft Spruce would function the same way: 01-06600
Keep in mind you will now have an epoxied layer right up to the transparent part of the window. You will probably need to paint at least a small margin past the fiberglass, taking away from the clear part. If you're careful you can probably make it 1/4" or less.
I don't think youi need to worry about the cabin roof/fuselage joint. There will be a natrual seam there so paint cracks shouldn't be a problem.
Paint cracks are pretty common almost anywhere there are two materials butted together without a stress relief (think groove in a sidewalk), in this case window and Weld-on . On my 10 I am installing the windows with Silpruf. They are a ways from flying but I will report. It has worked great on other planes but doesn't look quite as clean and smooth as epoxied windows. Just depends on what you want.
Dave Saylor
AirCrafters LLC
140 Aviation Way
Watsonville, CA
831-722-9141
www.AirCraftersLLC.com
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of ddddsp1(at)juno.com
Sent: Wednesday, September 20, 2006 10:05 PM
To: rv10-list(at)matronics.com
Subject: Carbon Fiber tape
I was discussing HOW to put the windows in the rV 10 with a guy currently building a Lancair IV retract/pressurized. He suggested putting 1 1/2 inch wide Carbon Fiber tape over the window edges to help prevent them from cracking. He also said he would put it over the seam between the cabin cover and fuselage and the cabin cover and empenage. Does any one have experience with Carbon tape? I knwo West Systems sells some that is compatitble with their epoxy. Would this be a good idea? What has everbody used to fill in the seam between the cabin cover and fuselage/empenage? I think Microballoons would eventually crack in these areas. VIC.........are you seeing any stress cracks on your plane? What did you use in these areas?
Thanks,
DEAN
40449 Cowling/Baffling
________________________________________________________________________
Visit http://www.juno.com/value to sign up today!
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