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  #1  
Old 08-28-2021, 08:35 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,174
Default Silpruf RV-10 window process

I’m closing in on how I want to do this RV-10 window install. Current approach is a hybrid:
- Silpruf to install
- A bid of carbon over the top between the glass and cabin top/doors.

Reason being I don’t like the look of the adhesive showing through the glass, and I want the “belt and suspender” approach of using both.

My question for those that have done the Silpruf process, how many wingnut clecos will I need and what size?

Thanks,
Carl
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  #2  
Old 08-28-2021, 08:46 AM
lr172 lr172 is offline
 
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Location: Schaumburg, IL
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Know nothing about silpruf, however, I did use sikaflex on my 10 windows. You need to check into the elasticity of the silpruf. The Sika is over 300% stretch/compressioun and I get a good amount of movement of the window with resulting shape change from concave to flat to convex, based upon the ambient temps. If this also occurs with silpruf, your fiberglass covering will either crack or lift off if you cover that joint. This doesn't happen with the Lord, as it affords very little elasticity and instead the tension is being held in the acrylic.

Larry
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Last edited by lr172 : 08-28-2021 at 08:50 AM.
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  #3  
Old 08-28-2021, 08:52 AM
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Carl Froehlich Carl Froehlich is offline
 
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Larry,

How many clecos and what length (1/2” or 1”) did you need?

Carl
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  #4  
Old 08-28-2021, 09:10 AM
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digidocs digidocs is offline
 
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Carl,

I think there is a good chance this combination won’t work well.

- Silpruf is silicone based and even a *tiny* amount of silicone residue will prevent a good epoxy bond on the carbon layup. Silicone residue is also extremely difficult to completely remove.

- Silpruf is very flexible and can allow slight motion between the cabin and windows. This is a good thing overall. However carbon epoxy is very stiff and this mismatch has a good chance in resulting in cracks in the carbon/epoxy or disbonds with the underlying window.
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  #5  
Old 08-28-2021, 09:28 AM
KatanaPilot KatanaPilot is offline
 
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Location: Locust Grove, GA
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I just did our RV-10 windows using Sika and estimate I used about a dozen of the 1”clecos to do two windows at a time. Don’t know if the shorter ones will work, but these are what I had. I made small aluminum blocks with an AN960 washer superglued to the block, which was used to clamp the window. All of my cleco holes are outside the perimeter of the window.

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DA20-A1 "Princess Amelia" - gone home to Amelia Island
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RV-10 under construction at Synergy Air South

Last edited by KatanaPilot : 08-28-2021 at 09:43 AM. Reason: Corrected text
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  #6  
Old 08-28-2021, 09:31 AM
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Carl Froehlich Carl Froehlich is offline
 
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I tend to agree with the issue about flexibility - and my just go back to using Hysol instead of Silpruf or Sika.

Either way I would appreciate recommendations on how many wingnut clecos and what size (1/2” or 1”) I will need.

Carl
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  #7  
Old 08-28-2021, 09:32 AM
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Carl Froehlich Carl Froehlich is offline
 
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Thanks Krea.

Carl
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  #8  
Old 08-28-2021, 03:46 PM
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rickrv8 rickrv8 is offline
 
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I used a few more than Krea. I used 16 on each rear window and 19 on each of the door windows. I purchased longer clecos but ended up shortening them to work properly. I do agree with the others, expansion and contraction will cause issues if you also fiberglass the exterior.
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  #9  
Old 08-28-2021, 05:40 PM
TomSpencer46 TomSpencer46 is offline
 
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Location: ferrisburgh Vt
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I did not see where I would use wingnut cleco's again. I bought hardware store machine screws and made small wooden blocks to clamp the windows in. I used silpruf first made small spots around the parameter let them cure then with a razor trim them so the window is flush. Worked great.
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  #10  
Old 08-30-2021, 07:14 AM
lr172 lr172 is offline
 
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I used 4 or 5 1/8" clecos to hold the window on. I needed a minimum adhesive depth, so CA glued some washers around the holes in the F/G. However, I drilled through the plexi for the clecos, as I covered the seam and window with a high flex filler.
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Last edited by lr172 : 08-30-2021 at 07:16 AM.
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