Today I focused primarily on constructing the duct between the GIB eyeball vent mount and the NACA scoop (on bottom strake skin).  My plan was to accomplish this in 2 phases.

With the angle of the eyeball vent pointing at the center of the GIB there is a slight dogleg required in the duct, so the first phase was simply to create a duct tube coming off the aft side of the GIB eyeball vent mount.  I taped up a paper towel roll and biased it a bit so it was angled slightly inboard and slightly down.

For the glass —both UNI and BID— I simply dug into my scrap pile for the 2-ply layup to create the duct.

I laid down a 2″ ply of peel ply first, then laid up 2 plies of glass using my scrap glass.  I then peel plied the outer surface of the duct.

While the GIB vent duct layup cured, I cut the last lightening hole in the O₂ bottle sleeve mount on the aft end.  I then installed the mounting sleeve in the bird.

I then slid the O₂ bottle in place to see how it looked.

Here are a couple shots of the lightening hole at the aft end of the O₂ bottle mounting sleeve.

I’ll note that this fiberglass O₂ bottle sleeve mount is way lighter than the metal band system that came with the O₂ system from Mountain High.  I’ll have final comparison weights once I get the velcro straps attached to the front end for securing the O₂ tank in place.

A few hours later, I pulled the peel ply and razor trimmed the added duct segment on the GIB eyeball vent mount.

Here’s a couple more shots of the added duct segment on the GIB eyeball vent mount.

I then took some time to figure out the angles I needed to get the duct from this mount down to the NACA scoop.  After my assessment, I then marked the added duct segment to be trimmed.

After I trimmed the added duct segment on the GIB eyeball vent mount, I mocked it up in place inside the fuselage.

I then spent a good hour+ creating a mold for the second segment of the duct that will connect to the NACA scoop… Phase 2.  After I glassed it (using scrap glass), I then peel plied it.

Again, a few hours later I pulled the foam mold, tape and peel ply to reveal a fairly decent duct segment.

And here’s a shot from the other end… note that I drilled the 4 screw holes in the GIB eyeball vent mount flange.

I actually floxed and glassed the two pieces above back together but failed to get a pic of it… I’ll grab one tomorrow as I hopefully finish installing the GIB fresh air eyeball vent and duct (Phase 3).