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Bret Smith
Joined: 09 Jan 2006
Posts: 178
Location: Mineral Bluff, GA
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 Posted: Sat Jan 24, 2009 8:23 pm Post subject: Improvements to "Hinged" wingtip installation |
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Mark,
Well, after three days I have the hinges riveted to the wing, the tips trimmed and sanded and the hinges bonded and riveted to the right wing tip. Then, I ran out of 206 hardener...
I still have not been able to find some 0.50" UHMW block for the pin retainers. Any suggestions?
Bret Smith
RV-9A N16BL
Blue Ridge, Ga
www.FlightInnovations.com
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Fiveonepw(at)aol.com
Sent: Friday, January 18, 2008 2:38 PM
To: rv-list(at)matronics.com
Subject: Improvements to "Hinged" wingtip installation
For those of you who asked, I've added the complete prodedure for installing the wingtips with hinges to my ExperCraft website- go to:
http://websites.expercraft.com/n51pw/index.php?q=log_entry&log_id=23961
Click Next Entry>> at the top of each page for the rest of it. There are 27 more pages, so if you want to slog through the whole thing, get comfy... 
Thanks again to Rob Riggen for making ExperCraft the excellent service it is! Find it here:
http://www.expercraft.com/
and my homepage: http://websites.expercraft.com/n51pw/
From The PossumWorks in TN,
Mark Phillips, RV-6A "Mojo"
Start the year off right. Easy ways to stay in shape in the new year.
[quote]
href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
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Bret Smith
RV-9A (Emp) |
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bobbyhester(at)newwavecom
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| Posted: Sat Jan 24, 2009 8:54 pm Post subject: Improvements to "Hinged" wingtip installation |
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http://www.aircraftspruce.com/catalog/mepages/nylon.php
Order 6"x6" 1/2"=.25 sq ft = $9.55
Bret Smith wrote: [quote] Mark,
Well, after three days I have the hinges riveted to the wing, the tips trimmed and sanded and the hinges bonded and riveted to the right wing tip. Then, I ran out of 206 hardener...
I still have not been able to find some 0.50" UHMW block for the pin retainers. Any suggestions?
Bret Smith
RV-9A N16BL
Blue Ridge, Ga
www.FlightInnovations.com
From: owner-rv-list-server(at)matronics.com (owner-rv-list-server(at)matronics.com) [mailto:owner-rv-list-server(at)matronics.com (owner-rv-list-server(at)matronics.com)] On Behalf Of Fiveonepw(at)aol.com (Fiveonepw(at)aol.com)
Sent: Friday, January 18, 2008 2:38 PM
To: rv-list(at)matronics.com (rv-list(at)matronics.com)
Subject: Improvements to "Hinged" wingtip installation
For those of you who asked, I've added the complete prodedure for installing the wingtips with hinges to my ExperCraft website- go to:
[url=http://websites.expercraft.com/n51pw/index.php?q=log_entry&log_id 3961]http://websites.expercraft.com/n51pw/index.php?q=log_entry&log_id 3961[/url]
Click Next Entry>> at the top of each page for the rest of it. There are 27 more pages, so if you want to slog through the whole thing, get comfy...
Thanks again to Rob Riggen for making ExperCraft the excellent service it is! Find it here:
http://www.expercraft.com/
and my homepage: http://websites.expercraft.com/n51pw/
From The PossumWorks in TN,
Mark Phillips, RV-6A "Mojo"
Start the year off right. Easy ways to stay in shape in the new year.
[b]
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2thman(at)cablespeed.com
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| Posted: Sun Jan 25, 2009 8:26 am Post subject: Improvements to "Hinged" wingtip installation |
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I read with interest the discussion presented I think by Mark Phillips of a
technique for using hinges on the wingtip to avoid the multiple screws for
attachment apparatus. In the Lancair world many have been using a similar
technique for several years and it has been shown to be much more esthetic,
lighter weight and, as the author suggested, more durable because the paint
doesn't get dinged up and scratched during service events.
The difference is that in our world of plastic airplanes, metal hinges are
replaced with graphite ones to save additional weight, to decrease
substantially installation work and to increase durability by replacing
metal to composite bonds with composite to composite adhesive bonds that
will not be subject to deterioration under vibration and stress loads.
The dilemma faced with RV aircraft that use composite wingtips and cowls
attached to
metal fuselage and wings is that there is a greater challenge to bond these
dissimilar materials and to decide where the interface is best chosen -
between aluminum hinge and composite wingtip or between composite hinge and
aluminum wing?
In my experience I have learned that aluminum surfaces corrode into aluminum
oxide, which then wears away a minute layer during vibration and stress.
With metal hinges, this relentless constant process results in an
increasingly sloppier fit that starts at day one. Sometimes it results in
unsightly black streaks on the aircraft surface radiating from the source in
the direction of the airflow during flight. Sometimes it results in broken
hinge tabs over time after the attached part develops greater play when
forces are applied.
Carbinge graphite hinges don't exhibit these characteristics. They have
nylon sleeve bearings that don't wear. They save weight and the bonding
attachment is continuous all along the joint rather than point attached at
measured intervals. Modern high peel strength adhesives are available that
can provide very acceptable margins of safety when bonding to aluminum in
applications like wing tip attachment. As long as the metal is prepped
appropriately, the shear strength of the bond will be powerful enough to
easily suspend the entire wing from the hinge; in fact it could support the
entire aircraft.
For more detail and discussion of the technique with photos and additional
ideas about Carbinge Keepers to improve esthetics and ease of service use,
see www.carbinge.com. There is a page on wingtip installation as well as
discussion on cowl attachment. There is information on the engineering
tests we used to establish load limits for the device. If you look at the
photos you will note the samples were attached to aluminum tabs that the
testing device actually grabbed on to. These were attached using the same
high peel strength adhesives recommended for installation of Carbinge and
the adhesive bonds performed flawlessly during all tests.
Please note this is a shameless plug for a product. Read what you see here
in that context, but realize that the writer has knowledge of many
installation examples that have been successful for up to ten years over
thousands of hours of flight time in aircraft that perform at speeds and in
environments markedly more stressful than RV's are ever expected to achieve.
Regards,
John Barrett
Leading Edge Composites
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