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07-17-2013, 01:21 PM
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Join Date: Nov 2010
Location: West Linn, Oregon
Posts: 1,351
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Getting Baffle Fabric to Seal
I have noticed that some of my baffle fabric isn't sitting as flush against the upper cowl as I would like. I can see some "puckering" or "waves" along the back side where it should be flush with the cowl interior. What is the best way to encourage this to sit flush? A small cut V channel in the pucker?
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CharlieWaffles - But you can call me " Mark"
RV-10
N928MT
Flying - AKA Still Tinkering
Build Project Site
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07-17-2013, 01:25 PM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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I found that too wide a strip is a problem. Have to sneak up on the best width. Don't go too far or it will flip back...
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07-17-2013, 01:26 PM
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Join Date: Nov 2010
Location: West Linn, Oregon
Posts: 1,351
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So cut the baffle back to a shorter height?
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CharlieWaffles - But you can call me " Mark"
RV-10
N928MT
Flying - AKA Still Tinkering
Build Project Site
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07-17-2013, 01:38 PM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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Thats what I did, not saying that will fix yours but it worked for me.
A few short slits in the pucker places should not hurt either as long as the uncut part still contacts the cowl.
Pretty soon you will see marks on the cowl and the rubber and will be able to tell where your leaks are. It happens pretty fast.
Baffle sealing is more art than an exact science. It takes trial and error.
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07-17-2013, 01:41 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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I ended up changing the fabric reinforced stuff for the orange silicone material.
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010 
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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07-17-2013, 02:04 PM
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Join Date: Jan 2005
Posts: 3,642
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Remove the couple outboard rivets, pull fabric down lower and re-rivet. This should have the desired effect. Did for me.
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Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto
Donation reminder: Jan. 2021
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07-17-2013, 05:26 PM
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Join Date: Nov 2010
Location: West Linn, Oregon
Posts: 1,351
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Any good rule of thumb on how much fabric should be in contact with the cowl itself? I'm wondering if my fabric is indeed too tall and is bending over too much.
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CharlieWaffles - But you can call me " Mark"
RV-10
N928MT
Flying - AKA Still Tinkering
Build Project Site
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07-17-2013, 06:07 PM
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Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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Just cut one slit from the point of the pucker out. That'll make that pucker lay down. Later after it imprints, you can reevaluate.
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Actual repeat offender.
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07-17-2013, 10:22 PM
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Join Date: Nov 2005
Location: San Francisco, CA
Posts: 525
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Looks very familiar. I had the same issue in the same corner. In my case, it never ended up laying flush.
I would do as airplaneslakes says. Rerevit with fabric pulled down to contour better with the upper cowling shape. You should end up with puckers or folders in between the rivets which can easily be sealed with a bit of RTV.
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#40533 RV-10 Builder and CFI
1/2006 Started build
10/19/2011 First flight
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