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  #11  
Old 01-11-2018, 12:15 PM
Canadian_JOY Canadian_JOY is offline
 
Join Date: Aug 2007
Location: Ontario, Canada
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Great write-up indeed. I didn't know the Plasti-Fix product existed. Good to know.

Given the highly hazardous abrasive application process you used, I'm glad to see you had canine supervision to ensure you did it right! :-)
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  #12  
Old 01-11-2018, 01:10 PM
Bevan Bevan is offline
 
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Location: BC
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Excellent workmanship, and result write-up. Thanks for documenting it for should it be needed in the future.

Bevan
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  #13  
Old 01-11-2018, 01:21 PM
jklusman jklusman is offline
 
Join Date: Feb 2013
Location: Lafayette, IN
Posts: 7
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Thanks for the super documentation, Scott. The canopy on my RV-8 has a 5-inch crack in almost the same location. It has been stop-drilled twice and seems to be stabilized. This canopy was installed using machine screws. I didn't build the aircraft, and when I bought it, the crack to the first stop-drill was covered with a decal. After the crack extension, probably caused by temps near zero in the hanger, I paid more attention to closing the canopy and noticed that latching it caused a slight distortion of the frame to the left. So, I now close the canopy the final 1/4 inch when getting ready for T/O by pushing on both sides of the front frame. Don't know if that will make a difference, but it sure can't hurt. I leave the canopy open 1/2 inch when it's in the hanger. I've bookmarked your page just in case...
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  #14  
Old 01-11-2018, 07:49 PM
RViter RViter is offline
 
Join Date: Jun 2009
Location: Mesa, AZ
Posts: 195
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Kept expecting a surprise ending - a faux Targa strip painted on the inside/outside of the Plexi that would look like a design feature.

Since I'm not an RV-8 owner the position of such a faux strip and the possibility of simply obscuring visibility is difficult to judge but considering the visual effect, would it otherwise work?

Thanks for the write-up and details of a repair option.
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  #15  
Old 01-11-2018, 08:35 PM
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Scott Chastain Scott Chastain is offline
 
Join Date: Jan 2005
Location: KMCE
Posts: 683
Default Labor Hours

Quote:
Originally Posted by Saber25 View Post
. . . How many labor hours involved?

Every time I look at my 30 year old canopy I knock on wood...it was possibly the most difficult part of the construction.

Cheers, Hans
Hello, Hans,

I did not keep track of the hours, but if I had to guess, I'd say I spent about 4 hours jigging, 2 hours opening, 2 hours filling, and maybe 6 hours polishing. The actual prep work for the cut, fill, and for polishing took probably 5 hours total. All said, the entire repair took probably 20 hours of work tops, and I am a super slow builder.

Congratulations on having a crackless 30-year-old canopy! That is the mark of a true craftsman.
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  #16  
Old 01-11-2018, 08:50 PM
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Scott Chastain Scott Chastain is offline
 
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Location: KMCE
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Default Targa Strip

Quote:
Originally Posted by RViter View Post
Kept expecting a surprise ending - a faux Targa strip painted on the inside/outside of the Plexi that would look like a design feature.

Since I'm not an RV-8 owner the position of such a faux strip and the possibility of simply obscuring visibility is difficult to judge but considering the visual effect, would it otherwise work?

Thanks for the write-up and details of a repair option.
Hi, Gary,

I knew going into the repair option that, aesthetically, the canopy was going to be scarred for life. As it is, passengers are just going to have to deal with a battle scar staring them right in the face, at least until the canopy gets replaced. I won't mind flying with a little reality reminder stitched over my left shoulder. I'll be flying something airworthy. That's what matters for now.

Smooth Air!
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  #17  
Old 01-11-2018, 09:08 PM
moosepileit moosepileit is online now
 
Join Date: Dec 2010
Location: Floyds Knobs, IN
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Could make it look like the SMDC in some ejection seat systems.
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  #18  
Old 01-11-2018, 09:43 PM
Captain Avgas Captain Avgas is offline
 
Join Date: Oct 2005
Location: Melbourne, Australia
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Quote:
Originally Posted by Scott Chastain View Post
As the polishing progressed, small occlusions became visible along the upper edges of the V-groove.

The cause of the occlusions was unknown. Great care was taken to clean the plastic prior to bonding. Nevertheless, whether or not the imperfections would develop into full-blown cracks was yet to be seen.
Scott, a fascinating and instructive post with great pix. However a couple of questions for you.

Can you tell me why you used the PPG DX330 Acryli-Clean to prep the canopy. My understanding from reading the product tech info is that the DX330 is not suitable for acrylic (despite the name). The PPG SX103 might have been the more appropriate product. Is it possible that the occlusions you developed arose through using the wrong cleaner.

I am surprised that when you were using a Polyvance adhesive (ie Plastifix Clear) you did not use the Polyvance cleaner (1000-A Super Prep Plastic Cleaner) to maintain compatibility.

And finally, the fact that the Plastifix Clear was not in reality clear at all (but translucent) must have been disappointing. Is it possible that a Weldon Product might have been more transparent.
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  #19  
Old 01-12-2018, 08:48 AM
Rupester Rupester is offline
 
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Location: Mahomet, Illinois
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Great post, Scott. A practical and innovative solution to a relatively common problem that doesn't offer a lot of fix options. If I were faced with the same problem, I'd go the same way. No way do I want to look at all those hours for building a second canopy in its entirety.
Thanks!!!!!
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  #20  
Old 01-12-2018, 11:57 AM
RV7ForMe RV7ForMe is offline
 
Join Date: Jul 2015
Location: Europe
Posts: 317
Default Thank you!

Hope I never need this but I have downloaded it with pictures and put into my folder for future reference if the pictures were to disappear!

Thank you for writing it up.
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