The RV-4 canopy acts as an airfoil. I think I saw someone having calculated the uplift of the canopy, presumably at VNE. Now I can't find that post.
I'm trying to design brackets to allow for second hole in instrument panel and F-407 for taxi position. Like this https://drive.google.com/open?id=1mB...iQRdM-_7wu1naK
in my RV-3B. But I'm trying to make it as small as possible to reduce impact on panel space.