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Dang…Cracked My Canopy!! 😉

Ironflight

VAF Moderator / Line Boy
Mentor
But hold on…it was my “practice canopy”!

When I bought the untouched F1 QB kit from Vince a little over a year ago, we found that the canopy had been stored in some way that it developed a big divot in the top - like someone stored it upside down in a hot place while it was sitting on a 4x4 or something. Not fixable according to Airplane Plastics, so we sourced a new (tinted) one from them, and reached the point this week where it has been warm enough to start fitting. As anyone who has carved on an RV-like canopy knows, the task looks daunting - if not impossible - before you get started. Nothing sits in its final location until you carve on it, but you can’t carve on it until it’s in its final place - or can figure out where to carve. So you sneak up on the fit… and sometimes you learn that you have over-trimmed it because you didn’t know what you didn’t know.

I have fit quite a few canopies in my life, and still take it with caution - and since I happened to have this extra canopy that was destined for the scrap bin, yet would serve as a fit-dummy to the frame, I decided to use it first. After doing all my trimming to the point where I was ready to split off the windshield, I transferred what I had learned to the actual “good” canopy, and very quickly had it fitting perfectly. Then I had to figure out where to do the “big cut” - so again I draped the practice glass on the frame first, and developed a process for figuring out the cut line.

It was while doing the big cut on the practice canopy that it shifted on the table and “snap” - I had a six inch crack. I wasn’t too broken up over it - the thing was already unusable for flight….and it was still going to serve its purpose for procedure development, so I stop-drilled and taped the crack, and pressed on. Got a great fit, learned what I needed, and did the same thing (without the crack of course!) on the final piece of plastic, and I am very happy with the fit. And… the practice piece is still available for further “practice”.

When you buy a Sonex canopy, they won’t sell you just one. The canopy costs a couple hundred bucks - the shipping is well more than that - so they require you to buy two because so many people screw up the first one, and who wants to pay the shipping twice? It costs the same to ship two…. Now it might seem a luxury to buy an extra Van’s canopy, but do the math. Vince tells me that a canopy sells for about $1450. The shipping for the new one I got (from Ohio) was about $650. Building a Rocket (or modern RV) is going to run close to $200K these days… so that extra canopy doesn’t look so bad if you had to pay the shipping for a new one all by itself. Not saying it’s something everyone (or anyone for that matter….) SHOULD do - but it’s worth thinking about “outside the box”…..

Pics:

“Yup - you can just sit there on the floor you cracked canopy you….”
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Stop drilled and taped (on both sides) so that I could keep using it for fitting…not totally worthless!
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Much mo’ better … the final tinted canopy fitting is coming along nicely!
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Might be interesting to use the cracked canopy as an escape tool test. I think your scientific way of looking at things would bring something new to the discussion.
I think this would be a great idea. Instead of just sitting in there making airplane noises, put that bad canopy on a frame, close it, and see what it takes to escape through it.
 
Might be interesting to use the cracked canopy as an escape tool test. I think your scientific way of looking at things would bring something new to the discussion.
Great idea.
Local EAA Chapter 105, often considered Vans home wing, did this. Perhaps someone can find the article. I did a quick search with no luck. I can see Len in my mind beating on it!

It’s amazing to me how these crack, seemingly out of nowhere. I took all my trimmings and bent them, twisted, froze, beat on them, and couldn’t make a crack but they were not a full canopy. It’s tough stuff, until it isn’t.
 
Might be interesting to use the cracked canopy as an escape tool test. I think your scientific way of looking at things would bring something new to the discussion.
That’s actually been done quite a few times, and results posted here on VAF….I think I saw it just the other day (but might have been on another forum….). When the Rocket is finished, there might be a neighborhood canopy breaking party…we’ll see….
 
I had my old scratched canopy laying around for awhile. I decided to try breaking it up with my escape tool which was pretty easy but probably wouldn’t be if I was in an upset plane.

Later, I wished I had kept my old canopy to use for making a sunscreen pattern.
 
That’s actually been done quite a few times, and results posted here on VAF….I think I saw it just the other day (but might have been on another forum….). When the Rocket is finished, there might be a neighborhood canopy breaking party…we’ll see….
I just this week posted our EAA chapter's canopy breaking party results:
 
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