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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25627
Location: Livermore CA USA
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 Posted: Fri Oct 02, 2009 5:54 pm Post subject: Side Cowl Pin Size... |
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Dear Listers,
I'm happy to report that the cowling on the 'ol RV-8 is complete and came out very nice. I was able to get the seams all around very nice and tight.
Here's my question. On the bottom cowl firewall pins and the top cowl firewall pins, the plans call out undersized pins. These go in nicely and I've got no complaints.
However, on the side pins that join the top and bottom cowling pieces, the plans call out an AN257-P3 hinge and don't mention using an undersized pin. I am able to get the side pins in and out with a drill but its a lot of work, especially going in, and it just seems like this is going to wear out the hinges after a while.
In the kit, I noticed that Van's shipped two different types of hinges in the three-foot lengths required for the cowling sides. There are two, 3' long AN257-P3 pieces and two, 3' long <other kind of hinge> that seems to be steel instead of aluminium like the AN257-P3. The pin inside of these steel hinges is about 2/3 the size of the pin in the AN257-P3 hinges. So, my logical thinking lead me to think that you're suppose just use the pins from the steel hinges on the sides for easier pin insertion/extraction. Am I reading this right? Or is it just a coincidence that they sent the steel hinges? I don't know what else to do with them.
Thanks!
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's All New RV-8 Construction Blog
Snorkel Intake Installation & Governor Recabling (1700 hours and counting)...
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Matt Dralle
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n223rv(at)wolflakeairport
Guest
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| Posted: Fri Oct 02, 2009 7:39 pm Post subject: Side Cowl Pin Size... |
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You don't use undersized pins on the sides... Try Boelube to
lubricate, the cowl and pins will fit much easier after a few heat
cycles of the engine.
Sent from my iPhone
On Oct 2, 2009, at 9:54 PM, Matt Dralle <dralle(at)matronics.com> wrote:
| Quote: |
Dear Listers,
I'm happy to report that the cowling on the 'ol RV-8 is complete and
came out very nice. I was able to get the seams all around very
nice and tight.
Here's my question. On the bottom cowl firewall pins and the top
cowl firewall pins, the plans call out undersized pins. These go in
nicely and I've got no complaints.
However, on the side pins that join the top and bottom cowling
pieces, the plans call out an AN257-P3 hinge and don't mention using
an undersized pin. I am able to get the side pins in and out with a
drill but its a lot of work, especially going in, and it just seems
like this is going to wear out the hinges after a while.
In the kit, I noticed that Van's shipped two different types of
hinges in the three-foot lengths required for the cowling sides.
There are two, 3' long AN257-P3 pieces and two, 3' long <other kind
of hinge> that seems to be steel instead of aluminium like the AN257-
P3. The pin inside of these steel hinges is about 2/3 the size of
the pin in the AN257-P3 hinges. So, my logical thinking lead me to
think that you're suppose just use the pins from the steel hinges on
the sides for easier pin insertion/extraction. Am I reading this
right? Or is it just a coincidence that they sent the steel
hinges? I don't know what else to do with them.
Thanks!
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's All New RV-8 Construction Blog
Snorkel Intake Installation & Governor Recabling (1700 hours and
counting)...
<2009.09.15 - RV-8 - Cowling Fitting And Installation Complete
( .jpg>
<2009.09.15 - RV-8 - Cowling Fitting And Installation Complete
(9).jpg>
<2009.09.15 - RV-8 - Cowling Fitting And Installation Complete
(11).jpg>
<2009.09.15 - RV-8 - Cowling Fitting And Installation Complete
(1).jpg>
<2009.09.15 - RV-8 - Cowling Fitting And Installation Complete
(2).jpg>
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Terry Watson
Joined: 09 Jan 2006
Posts: 290
Location: Seattle, WA USA
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| Posted: Fri Oct 02, 2009 8:49 pm Post subject: Side Cowl Pin Size... |
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Matt,
Van's sell a hinge pin with a little stainless tab welded to one end.
Whatever the diameter of that hinge pin is would be the right one for the
sides, since that's what the pins are for. I remember that when I did mine
several years ago, I found that most everyone complained that the pins were
hard to get in at first but got easier over time. A little Boelube helps.
It's also important to grind the end down at an angle so you can twist it a
bit to get it into a slightly misaligned hinge hole.
Mine has been sitting in the shop for longer than I care to admit, but it
does get a little easier each time I pull the cowl off to check and change
the dehydrator plugs in the engine.
Terry
RV-8A
--
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John Myers
Joined: 10 Jan 2006
Posts: 11
Location: Cedar Bluff, AL
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| Posted: Fri Oct 02, 2009 10:42 pm Post subject: Side Cowl Pin Size... |
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Matt, I think the pins for the cowl sides are usually approximately .090 in
diameter. Don't know about your hinges. Vans sells the special hinge pins
with the tabs on them and I think they are .090. Go to the Catalog page and
search for Cowl hinge pin. Somewhere on Van's site there is also a doc
about hinges used with Van's kits. There are 1/8 inch (.125) hinge pins,
3/32
or about .093 and 1/16 in (.063) for different apps. I think the MS or AN
257 hinges are the
3/32 ones.
I ended up ordering extruded hinges rather than rolled and used 6 ft hinge
pins cut to length for insertion from inside the cockpit but I am pretty
sure they are about .090 pins as well.
Your 8 really looks good in the pictures. Good luck.
John
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