Solution: a retractable pitot tube. Credit for this idea: Gene comes through again.
Here's photos as to how we do it:
First of all, this is what it looks like when it's extended. We've placed the pitot tube through the leading edge of the wing, which is also our front spar. Although this photo shows a carbon fiber spar, it works equally well with aluminum spars. Also note that the location of the pitot tube is very close to the wingtip, so there is very little stress on the spar at this point. (I have to have a very good reason to drill through a spar.)
|Retractable Pitot Tube in Ultralight Aircraft|
Here is the same Pitot Tube, retracted into the wing.
|Retractable Pitot Tube, inside ultralight aircraft wing|
My shop foreman, Gene, has also fabricated some very nice boots and 'Remove Before Flight' flags for the Pitot Tubes. Simply made out of nylon webbing, a metal clip, and rubber tubing, it slips over the front of the Pitot Tube.
|Rubber Boot, "Remove Before Flight" on front of Pitot Tube on ultralight aircraft|
|Mating the Pitot Tubing|