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carl.froehlich(at)verizon
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 Posted: Sat Nov 03, 2012 2:19 pm Post subject: Air box mod to fix filter deformation |
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All,
This is a mod to the air box I did on the RV-10, and just now back fitted onto the RV-8A.
Over the years with the RV-8A I’ve had to repair the air box and replace the filter. As you can see from the first photo, the bottom of the filter deforms (curves in). This tends to shorten the filter such that it drops out of the top and impairs the seal with the top plate. I also had to add fiberglass to the bottom of the air box as the relative motion between the bottom of the air filter the air box eroded away the fiberglass bottom.
The fix was to add a .032” aluminum plate to the bottom of the air box. The plate eliminates the bottom erosion and the added brackets hold the filter shape. A side benefit is that alternate air door now sandwiches the bottom fiberglass between two piece of metal making a sturdier install. I also took the step to add proseal between the aluminum plate and the air box bottom.
Carl
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at6c(at)bellsouth.net
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| Posted: Sat Nov 03, 2012 4:27 pm Post subject: Air box mod to fix filter deformation |
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Why? My RV8 has gone through 5 inspection and this has not been seen.
George
On 11/3/2012 5:18 PM, Carl Froehlich wrote:
[quote] <![endif]--> <![endif]-->
All,
This is a mod to the air box I did on the RV-10, and just now back fitted onto the RV-8A.
Over the years with the RV-8A I’ve had to repair the air box and replace the filter. As you can see from the first photo, the bottom of the filter deforms (curves in). This tends to shorten the filter such that it drops out of the top and impairs the seal with the top plate. I also had to add fiberglass to the bottom of the air box as the relative motion between the bottom of the air filter the air box eroded away the fiberglass bottom.
The fix was to add a .032” aluminum plate to the bottom of the air box. The plate eliminates the bottom erosion and the added brackets hold the filter shape. A side benefit is that alternate air door now sandwiches the bottom fiberglass between two piece of metal making a sturdier install. I also took the step to add proseal between the aluminum plate and the air box bottom.
Carl
[b]
| | - The Matronics RV8-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?RV8-List |
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dan.pat.b(at)gmail.com
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| Posted: Tue Nov 06, 2012 5:38 pm Post subject: Air box mod to fix filter deformation |
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My RV-7A first flight was on Aug 6, 2009 - one year later during the annual condition inspection I discovered the filter bottom outside edge had worn completely through the fiberglass in several places and the alternate air door assembly had pulled away from the airbox - I built up the box with two layers of fiberglass cloth/resin on the inside of the box and three layers on the outside - I also fabricated an .032 AL ring to reinforce the inside of the box where the alternate air door assembly fasteners come through. I haven't had any isssues since but I'm keeping a close eye on it. I've heard and read several similar stories - maybe Van has already tackled the problem - if not, that airbox needs some re-design / re-engineering. Dan Bergeron
RV-7A N307TB
366 hours since first
flight 8/6/09
On Sat, Nov 3, 2012 at 8:26 PM, George <at6c(at)bellsouth.net (at6c(at)bellsouth.net)> wrote:
[quote] Why? My RV8 has gone through 5 inspection and this has not been seen.
George
On 11/3/2012 5:18 PM, Carl Froehlich wrote:
| Quote: |
All,
This is a mod to the air box I did on the RV-10, and just now back fitted onto the RV-8A.
Over the years with the RV-8A I’ve had to repair the air box and replace the filter. As you can see from the first photo, the bottom of the filter deforms (curves in). This tends to shorten the filter such that it drops out of the top and impairs the seal with the top plate. I also had to add fiberglass to the bottom of the air box as the relative motion between the bottom of the air filter the air box eroded away the fiberglass bottom.
The fix was to add a .032” aluminum plate to the bottom of the air box. The plate eliminates the bottom erosion and the added brackets hold the filter shape. A side benefit is that alternate air door now sandwiches the bottom fiberglass between two piece of metal making a sturdier install. I also took the step to add proseal between the aluminum plate and the air box bottom.
Carl
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