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  #1  
Old 10-12-2013, 07:34 PM
acroboy's Avatar
acroboy acroboy is offline
 
Join Date: Jan 2008
Location: McKinney, Texas
Posts: 15
Angry Canopy Mistake

Ok, I've messed up! I drilled the front latch hole (for C-409) through the canopy frame and into the instrument panel (F-403). The problem is I managed to align the hole exactly with the nutplate that attaches the fwd top skin (F-421). Anyone have any clever ideas how I can get myself out of this mess? I might be able to use a thin stop nut instead of the nutplate but I doubt it. In any case the screw and nut will interfere with the nylon block (C-410). I've included a few pictures to show my predicament.





Brad, McKinney TX
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  #2  
Old 10-13-2013, 12:32 AM
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Dbro172 Dbro172 is offline
 
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Default

Move the nut plate.
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  #3  
Old 10-13-2013, 02:26 AM
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Default Or.....

Swap the nut plate for one with both rivets on one side.....it looks (might be the angle) that the hole will only interfere with the bottom portion of the nut plate.
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  #4  
Old 10-13-2013, 06:11 AM
fixnflyguy fixnflyguy is offline
 
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Location: Winston-Salem, N.C.
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Default Leave it

I think you will be fine. On mine, I installed a phenolic block about 1/4" thick on the forward side that the pin fits snuggly into, but I believe it could just as easily be installed on the AFT side as there is quite a bit of room between the canopy frame and the panel. Any extra pin length can be trimmed off, as it doesn't need to be that long, and actually causes problems with the forward skin panel interference. I believe many others have done the same. I also put a microswitch on the forward side that is contacted by the pin when fully closed, which extinguishes a bright red LED indicating the canopy is fully locked.
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  #5  
Old 10-13-2013, 09:27 AM
sf3543 sf3543 is offline
 
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Location: San Antonio, TX
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Do away with the nut plate. Make your block out of delrin and just drill a hole so you can use the block as a substitute for the nut plate. You don't even need to thread it since it will act as a self locking nut. Just drill the hole undersize for the screw and screw it in.
That will also help hold the block in place.
You could even put number 4 screws where the rivet holes are to fill them in and hold the block even more firmly.
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Last edited by sf3543 : 10-13-2013 at 09:29 AM.
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  #6  
Old 10-13-2013, 10:25 PM
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acroboy acroboy is offline
 
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Thanks for all the great ideas. I will probably go with Steve's idea of using the block as my nut plate. I figure I can always helicoil it if the plastic starts to wear. As far as I can tell there isn't room for any kind of nut plate. I had thought of trying a pk-7 clip nut since it might be slightly thinner. No matter which way I go, even the screw must be very short in order not to interfere with the shaft. The idea of using the block on the aft side is definitely worth considering as well as long a I penetrate the panel with enough margin.
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  #7  
Old 10-14-2013, 08:48 AM
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On mine I just modified the nylon block to fit around the offending nut plate. Ground clearance with dremel tool, etc.

If the nut plate and installed screw don't prevent the canopy latch rod from fully engaging you have no problem. I'd do this before going the helical, tapping the nylon block route. Works fine on my airplane this way.
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  #8  
Old 10-14-2013, 09:13 AM
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n82rb n82rb is offline
 
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i just did away with the block and used a .125 or .250 inch aluminum doubler on the panel instead.

bob burns
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  #9  
Old 10-14-2013, 10:15 AM
nauga nauga is offline
 
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Add me to the list of people that carved a cavity in the holddown block to clear the nutplate.
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  #10  
Old 10-14-2013, 05:33 PM
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N184DA N184DA is offline
 
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Location: Tacoma, WA
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Quote:
Originally Posted by nauga View Post
Add me to the list of people that carved a cavity in the holddown block to clear the nutplate.
Me as well,,
And in addition to modifying the block with a dremel to snug up against the nut plate,, I also cut the block in half, and have equal portions of the block on both sides of the panel.

And, I also have a "special" screw for that hole, in that it is trimmed very short, and does not protrude beyond the nut-plate. Another one of those "custom-features" for my airplane
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