Before closing up the skin on the left wing, it made sense to plan for and lay out everything needed to use the built-in feature of the Dynon Skyview which allows a display of angle of attack. All that is needed is a pressure signal from a port on the leading edge positioned at a specific angle to horizontal. All the hardware and positioning information is given in the thread shown below on Vansairforce.net. This thread should be read in its entirety.
AOA link here
As suggested, I mail-ordered the parts from McMaster-Carr for the princely sum of about $15 for all the fittings, tubing, etc. The hardware can't actually be installed prior to receiving the airworthiness certificate from the FAA, of course. (Voice from the future: Van's came out with their own version of this with the hole in a slightly different place. The slightly different placement is accommodated in the calibration. Works the same.)
For the port itself, an LP3-6 rivet with the mandrel punched out works great. A short piece of the same 1/8th inch ID tubing used for the static ports fits nicely over shop head, sealed and held in place by a glob of instrument-safe RTV. A 1/16th inch ID tube is coupled to the 1/8th ID tube and run to the wing root for later attachment to the Skyview. A mockup of these parts is shown in picture two. The way it will be installed in the leading edge is shown in picture one.
The method that Joe Gores came up with and detailed in the link above can be used to locate the angular position of the port without actually having to measure any angles. I'm sure that the calibration procedure can accommodate some angular position error in port location. The early users of this method employed a common needle valve used for inflating basketballs (or deflating footballs if you're from New England) for the port. By all reports, the hollow rivet works as well and is indistinguishable from the other few thousand rivets in the wing.
Some have suggested that the 1/16th ID tubing will fit into the existing grommets installed in the ribs for the wing-tip light wires (seen in the picture). I couldn't make this work, even if I removed the string that we all ran according to plans to make is possible to run wires after completion. There's a convenient route for the tubing against the spars, shown in the pic. After closing the wing, everything can be reached with the inspection plate removed (the inspection hole can be seen at the lower right of pic one).
Both wings are now complete and are stored in the wing stand. Work is proceeding on the flaperons.
