I don't have a pic of the relief slot, it's filled now.
Basically, with a cutting disc, make a 3/4 x 3/32'ish slot and then drill the end of it out with a radius greater then the width of the slot to prevent cracking/spreading.
Make sure the slot fits comfortably within the parameters of the top of your fairing on the plexiglass, mine went over a bit so my fairing is a probably a 16th or so higher than the instructions.
The location is going to have to be where you need the relief, mine was dead center.
This just allows more torsional (twisting?) movement on both sides of the slot so there isn't a bunch of stress built-up in one area that leads to a crack later.
Edit: If you haven't riveted the side skins on yet it's going to be better to shave some material off the bottom of the canopy and continue working towards a better fit, I didn't really have this luxury. In my judgement, trying to pull the canopy out of the dimpled side skins and get it back in a few times to get it right would have caused more cosmetic damage that it was worth, assuming it would even be possible.
Hope this helps!
#140376 RV-14A QB IO-390 Thunderbolt
Progress: Engine and Fuel System Testing
Last edited by bkervaski : 02-08-2018 at 07:39 AM.