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  #1  
Old 06-08-2017, 07:24 AM
dave4754 dave4754 is offline
 
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Default Cowling RV 7 side hinges

I am about to install the long side hinges and wondered if anyone knows what is meant by allowing the " hinge to drift up" at the end. This instruction baffles me and thought I would throw it out there?

Also what did you do to finish the outer skin of the cowling. I have the pink one?

Dave
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  #2  
Old 06-08-2017, 07:38 AM
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Raymo Raymo is online now
 
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It means you won't try to keep the hinge centered on the line between the upper and lower cowl. Allow the hinge center to "drift" up but not too much or you will lose edge distance.

I have a SJ long cowl, which is still bare on the outside but the inside was treated to avoid oil penetration. Same for the edges. There are threads on this topic.
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Last edited by Raymo : 06-08-2017 at 07:40 AM.
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  #3  
Old 06-08-2017, 09:58 AM
dave4754 dave4754 is offline
 
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I found some great work in the archives on it.

Dave
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  #4  
Old 06-08-2017, 10:36 AM
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sglynn sglynn is offline
 
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Default cowl hinge and Evercoat Glazing Putty

I just finished my lower cowl. I finished the surface using Evercoat Polyester glazing putty. It is at autoparts stores. I tried the process of painting thick epoxy resin on it, but the sanding was difficult and result looked bad. But by feeling with hands I could find and fill the pores with glazing putty. When I primed it, the defects showed even more, so I just kept squeezing glazing putty into the pores. It is easy to sand and make smooth.
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  #5  
Old 06-08-2017, 11:44 AM
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jmjula jmjula is offline
 
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Per my friend Roy, I replaced the lower half of each hinge with a hinge that had another 1/4" of width. This allowed us to center the hinge 1/8" above the the line of the cowling.
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  #6  
Old 06-08-2017, 11:46 AM
rv7charlie rv7charlie is offline
 
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If you buy the wider flange hinge stock & use it for the bottom side, you can allow the flange to bridge the seam along the whole length. Helps keep top/bottom aligned, and slightly improve the air seal at the seam.
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  #7  
Old 06-08-2017, 04:03 PM
BillL BillL is offline
 
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Quote:
Originally Posted by dave4754 View Post
I am about to install the long side hinges and wondered if anyone knows what is meant by allowing the " hinge to drift up" at the end. This instruction baffles me and thought I would throw it out there?

Also what did you do to finish the outer skin of the cowling. I have the pink one?

Dave
Dave, logically the cowl split line begins at the center of the crankshaft and extend backwards parallel to the longeron, right? Well, not so fast - I thought this but found that on my SJ cowl it was higher than the split line at the firewall.

So - check that with your Vans cowl to see if that is how they do theirs too.

I do remember that when making an aluminum attachment plate for the SkyBolts, the split line was not straight either, I had to bend it like a banana to get an even projection of material as it progressed to the rear. That may, or may not, be related to the "drift up" comment.
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Last edited by BillL : 06-08-2017 at 04:07 PM.
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