Guys,
The holes that allow for the screw to attach the tank to the wing are enlarged when I countersink for the screw. I am using a .032" test skin(thickness of tank skin) to test fit and when it is flush with the spar, the hole in the spar flange is large (close to .370). I searched this web page and that seems to be okay. I called Vans support and they said to not use a .032 skin as a guide to establish the depth of the countersink into the spar, but to countersink the spar until the screw is flush with maybe a slight halo. I have only done one hole and woulod appreciate some help.
The holes that allow for the screw to attach the tank to the wing are enlarged when I countersink for the screw. I am using a .032" test skin(thickness of tank skin) to test fit and when it is flush with the spar, the hole in the spar flange is large (close to .370). I searched this web page and that seems to be okay. I called Vans support and they said to not use a .032 skin as a guide to establish the depth of the countersink into the spar, but to countersink the spar until the screw is flush with maybe a slight halo. I have only done one hole and woulod appreciate some help.