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  #11  
Old 10-01-2018, 06:45 AM
JDA_BTR JDA_BTR is online now
 
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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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  #12  
Old 10-01-2018, 02:28 PM
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Originally Posted by RV-14E View Post

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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  #13  
Old 10-01-2018, 06:16 PM
rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by AX-O View Post
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?
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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  #14  
Old 10-01-2018, 09:59 PM
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Originally Posted by rvbuilder2002 View Post
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.
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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  #15  
Old 10-02-2018, 10:09 AM
rvbuilder2002 rvbuilder2002 is offline
 
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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.
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
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  #16  
Old 10-02-2018, 07:30 PM
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Quote:
Originally Posted by DanH View Post
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.

Dan, what kind of material is that? Did you still place the aluminum wraps over the top of it?
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  #17  
Old 10-02-2018, 08:43 PM
VA Maule VA Maule is offline
 
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Default Material?

Kinda sorta looks like duct tape to me .
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  #18  
Old 10-02-2018, 09:48 PM
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Originally Posted by czechsix View Post
Dan, what kind of material is that? Did you still place the aluminum wraps over the top of it?
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!
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  #19  
Old 10-02-2018, 10:12 PM
JDA_BTR JDA_BTR is online now
 
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Yep, I'm really glad I opened this can of worms.... a lot here....
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  #20  
Old 10-02-2018, 10:14 PM
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Quote:
Originally Posted by wjb View Post
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.
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.

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Last edited by DanH : 10-03-2018 at 07:33 AM.
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