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10-01-2018, 05:45 AM
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Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 1,055
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When you buy it in the can does it come with some kind of straw like WD40 does? Seems the 190ml caulk tube is the easiest to use? This comes in a lot of different packages.....
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Ser 104142, RV-14A flying - N1463 
Ser 83825, RV-8 building - N8638? 
USN Ret, Urologist, AME, Repeat Offender
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10-01-2018, 01:28 PM
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Join Date: Jun 2005
Location: SoCal
Posts: 2,452
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Quote:
Originally Posted by RV-14E
Forward baffle.
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The above RTV strips seem counterintuative to me. In my head the RTV that is not touching the front of the fin would bulge inside the empty space between the fins. limiting the airflow.
Not only is there one "strip" of RTV, there are 2.
Van's instructions tell the builder to do that now?
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Axel
RV-4 fastback thread and Pics
VAF 2020 paid VAF 704
The information that I post is just that; information and my own personal experiences. You need to weight out the pros and cons and make up your own mind/decisions. The pictures posted may not show the final stage or configuration. Build at your own risk.
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10-01-2018, 05:16 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by AX-O
The above RTV strips seem counterintuative to me. In my head the RTV that is not touching the front of the fin would bulge inside the empty space between the fins. limiting the airflow.
Not only is there one "strip" of RTV, there are 2.
Van's instructions tell the builder to do that now?
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If the instructions are followed, the RTV stripes will only be about .030 thick.
Enough to help prevent fretting wear, but not enough to cause any air blockage or leakage.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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10-01-2018, 08:59 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by rvbuilder2002
If the instructions are followed, the RTV stripes will only be about .030 thick.
Enough to help prevent fretting wear, but not enough to cause any air blockage or leakage.
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I dunno 'ole buddy. If the stripes space the wraps away from the fins by .030", there's a .030" wide leak gap along the side edges.
If the goal is to stop fretting and keep all the air where it belongs, gasket the whole inner surface of the wraps.

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Dan Horton
RV-8 SS
Barrett IO-390
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10-02-2018, 09:09 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by DanH
I dunno 'ole buddy. If the stripes space the wraps away from the fins by .030", there's a .030" wide leak gap along the side edges.
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It is a very small amount of surface area coated with a very flexible/compressible material.
My experience is that with the wraps pulled tight it has no influence but I imagine an even coating as in your photo would be the optimal plan.
Especially if you are measuring gaps with a feeler gauge 
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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10-02-2018, 06:30 PM
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Join Date: Mar 2006
Location: Spring Hill, KS
Posts: 365
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Quote:
Originally Posted by DanH
I dunno 'ole buddy. If the stripes space the wraps away from the fins by .030", there's a .030" wide leak gap along the side edges.
If the goal is to stop fretting and keep all the air where it belongs, gasket the whole inner surface of the wraps.

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Dan, what kind of material is that? Did you still place the aluminum wraps over the top of it?
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Mark Navratil
Spring Hill, KS
RV-8A N2D #80583 - built/flew/sold
RV-14A #140017 - wings complete, empacone in progress...
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10-02-2018, 07:43 PM
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Join Date: Apr 2016
Location: Bucking ham, Virginia
Posts: 208
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Material?
Kinda sorta looks like duct tape to me .
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Maule MXT-7(daily flyer)
Lancer 235(partner)
Raidial RV-8R Ephanage Done, Wings Done, Fuselage on it's tall Grove gear & engine hung
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10-02-2018, 08:48 PM
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Join Date: Nov 2012
Location: Half Moon Bay, CA
Posts: 1,035
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Quote:
Originally Posted by czechsix
Dan, what kind of material is that? Did you still place the aluminum wraps over the top of it?
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From a previous DanH post: it's 9 oz glass impregnated with Permatex - put in place wet. The aluminum baffles go over this, per plans. I'm baffling my IO-360 now, and have been scrubbing all relevant posts.
SUPER thanks go out to DanH for his wonderful posts on this subject!
__________________
Bill Bencze
N430WB RV-7 #74152 @ KHAF, tip-up; IO-360-M1B; Hartzell CS. !! Phase 1 !!
2357 hrs over 8.5 years to get to flying. Log at: http://rv7.wbencze.com
VAF 2020 donation happily made
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10-02-2018, 09:12 PM
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Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 1,055
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Yep, I'm really glad I opened this can of worms.... a lot here....
__________________
Ser 104142, RV-14A flying - N1463 
Ser 83825, RV-8 building - N8638? 
USN Ret, Urologist, AME, Repeat Offender
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10-02-2018, 09:14 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by wjb
From a previous DanH post: it's 9 oz glass impregnated with Permatex - put in place wet. The aluminum baffles go over this, per plans. I'm baffling my IO-360 now, and have been scrubbing all relevant posts.
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Yep, Loctite 598 or Permatex Ultra Black, same product. Roll it into the cloth between two sheets of 4 mil plastic. Cut the exact shape you wish to apply. Peel one side, stick it to the fins. Allow to cure, and only then peel the plastic off the outside.
When fastening the aluminum wraps into place for the final time, be sure to run a small bead of sealant across the the top , so air cannot flow between the aluminum and the outside of the fiberglass/silicone gasket. That would be a really useless leak.

__________________
Dan Horton
RV-8 SS
Barrett IO-390
Last edited by DanH : 10-03-2018 at 06:33 AM.
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