Started with drawing the positioning line for the AOA port. Joe the Michigan builder who did the math for the AOA port location gives measurements based on the leading edge rivets. Since his airplane used LP4-3 rivets, I temporally placed LP4-3 rivets into the rivet holes and then made a line tangent to the rivet heads per his instructions. The AOA port may be drilled anywhere on this line. I’m choosing to locate the hole for the port about an inch or so from the rib outboard of the stall warning micro-switch … there will be no interference with the operation of the stall warning micro-switch and it is also far enough away from the access port that making inspections or adjustments to the stall warning indicator should not pose a problem.
A line was drawn tangent to the aft edge of the two leading edge rivets. Anywhere on this line is where the AOA port can be located. For those interested in the math behind this location, it's approximately 30 degrees off the chord and 60 degrees off vertical. As a stall is approached, the port becomes more aligned with the air stream and thus the pressure in the tubing will increase. This pressure increase is analyzed by the Dynon Skyview and displayed on the screen as a bar graph.
Joe’s 30 degree AOA hole location verified by a protractor.
Drawing the pilot hole line for the AOA port.
At this point I’m torn as to which method I want to use to connect the AOA plumbing to the W-1202-L skin. Builders have used rivets with the mandrels removed as ports and others have used a sport ball inflating needle with the threads protruding the wing skin and Tygon tubing slipped over the needle (the original method pioneered by Joe a builder in
Joe's example of the inflation needle method for AOA.
While pondering which AOA method to use, went to work on the inspection access hole in the W-1202-L skin. The ten inspection plate screw holes require being dimpled for #6 screws and the rivet holes for mounting the ten nutplates also require dimpling along with the nutplates themselves. I suggest builders dimple the #6 holes first, then use a small diameter female dimple die to dimple the nutplate rivet holes for flush rivets. If the nutplate rivet holes in the skin are dimpled first, the large head of the #6 dies will likely be up against the rivet hole’s dimple and possibly distort it. The rivet holes in the K-1100-06 nut plates require dimpling as well.
Dimpling the ten screw holes in the inspection hole for #6 screws.
Dimpling a nutplate for flush rivets.
Using the pneumatic squeezer to rivet nutplates onto the W-1202-L wing skin's inspection hole.
Finished inspection access hole in W-1202-L bottom wing skin.
AOA hole location is on the bottom left and circled in red.