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  #41  
Old 07-11-2019, 02:48 PM
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Brantel Brantel is offline
 
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Quote:
Originally Posted by bkervaski View Post
Looks like a combination of both. The proseal and skin get "tacky", perhaps temperature related, and that's enough to hold it in place until the edge digs in as you raise it.

The red line shows where the QB sealant was applied and can potentially (likely, eventually) cause the issue.

Per the manual, there should be no sealant on top of F-01455 aft of F-01471 and no opportunity for the canopy forward edge to grab the sealant.

Edit: In fairness to the QB folks, I didn't have many issues with my QB fuse and wings, they were very well built, only minor issues, I would buy a QB again. However, to have my beautifully painted canopy take a hit like this is a bit heartbreaking and the month of downtime it's going to cause me is frustrating.

Bill,

Can you tell me what drawing number this clip came from?
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  #42  
Old 07-11-2019, 02:52 PM
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Quote:
Can you tell me what drawing number this clip came from?
Page 35-22 of the RV-14 manual.
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  #43  
Old 07-11-2019, 02:55 PM
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Quote:
Originally Posted by bkervaski View Post
Page 35-22 of the RV-14 manual.
Thanks, I am trying to steal ideas on how to improve my RV7 TU front seal.
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  #44  
Old 02-09-2020, 01:58 AM
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I am now in the club despite having removed proseal during the build after being warned in this tread.

I had totally forgotten about the potential issue, I was just in the hangar to install my autopilot servos. Hangar was cold and moist, 2 degrees centigrade so the proseal can apparently be sticky enough even at cold temps

IŽll bring tools and try to make it look good next weekend.

(Are we 100% sure that it is the proseal that is the reason, could it have been a little to much forward force on the canopy when opening, making the metal catch?)
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  #45  
Old 02-09-2020, 07:26 AM
Nova RV Nova RV is offline
 
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Magnus, I think the issue is that the clearance that you make (per plans) during construction is not enough to account for any temperature changes or slight shifting of the canopy assembly forward. Mine did this also and I noticed the gap I had changes quite a bit. In fact, I opened up the gap slightly where the clips are so it wouldn't catch and then about 6 months later I had it catch again and bend. This time I removed the canopy, increased the gap another 1/32", bent the hooked part of the clips down further, and fixed the bent skin then repainted the front of the canopy. So far no issue again but I watch the gap to make sure it's stable. I don't think the proseal is the issue really other than it can push the skin up and bend when the canopy assembly shifts around and moves slightly with temperature.
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  #46  
Old 02-09-2020, 08:09 AM
Stockmanreef Stockmanreef is offline
 
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I had this happen during fitting of the canopy--still in the build phase. I think that my plan is not only to consider the gap, but also I am considering the top lip of the front top skin. I plan to file it on top to "round off" the top edge of the skin. I am hoping that this will help to prevent the canopy from catching on the skin.

You can see in the picture in the previous post the sharp edge of the skin where the red line hits the skin. That is what I am going after.

Thoughts?
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  #47  
Old 02-09-2020, 08:26 AM
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The canopy moves up and forward simultaneously.. post a pic of your top seal.. I can tell by that if you’ll have the same issue ..
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  #48  
Old 02-09-2020, 11:46 AM
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I´ll post pictures after the next weekend. If I can get a helper, I will remove the canopy for fixing.

Ken: I think I will do a little of that as well
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  #49  
Old 02-10-2020, 04:54 AM
mturnerb mturnerb is offline
 
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I tried to use one of the aftermarket covers for the hinge and got the dreaded "Pop" when opening canopy. I removed the canopy and was able to satisfactorily fix the bend at edge. This event occurred after I had removed all the proseal of concern as discussed earlier in this thread. I ended up easing back the edges in the areas most likely to catch, including around the hinge covers, and going back to the factory hinge covers. Cosmetically this is not even noticeable unless you look at many RV-14s daily.

Fortunately for me this happened before paint so I didn't have to fix paint.

I wonder if Van's might want to look at this part of the design. The tolerances are so close and the impact of the most minimal binding at the front edge is so "heartbreaking" that this could probably use a bit of re-work either in the design or the instructions for builders. From what I can tell, if the D-seals are set back a bit from the edge there should be a good seal even if the gap at canopy edge is slightly wider.

I haven't done any precipitation stress tests so not sure my theory holds water. I tend to be a fair weather pilot and if leaving aircraft on the ramp for any period of time I'll put a cover on. I did put a little piece of clear paint protective film over the hinge covers after paint as I feel this area might be a bit vulnerable, even with properly installed foam seals and gasket dressing.
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Last edited by mturnerb : 02-11-2020 at 11:48 AM.
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  #50  
Old 02-11-2020, 11:35 AM
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Steve Melton Steve Melton is offline
 
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I saw this post and presumed these were RVPlasticParts.

Would a larger chamfer on the canopy side be beneficial?



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