Since I did a terrible job covering the hinge work on the ailerons I thought I would attempt to redeem myself as I did the tail control surfaces. Pictures are from one elevator.
With the control surface taped to the exact location you want, mark on the stab and control surface where the hinge will be located. Remove the control surface and on the center line drill the 1/8" hole for the hinges. You can see that I cut away a bit of the covering prior to drilling. More on that in the next picture.
I removed a portion of the covering film to countersink the hole for the hinge knuckle. The drill bit to counter sink will just chew into the film and make the hole a mess so take your #11 blade and be careful.
The hinge hole is countersunk into the
control surface using a 1/4" drill bit.
Here you can see how the hinge fits into the hole. There is clearance on the sides of the knuckle for free movement but enough clearance vertically for proper movement. The hinge point is now offset from the leading edge of the control surface to pivot in a scale manner.
Mark vertical lines in your stab pockets and draw a center line to mark where to drill the holes for the hinges.
Drilled out, you now enlarge the holes slightly with your #11 blade for the hinges to seat properly. Trying to ram the hinges into just the round hole can cause the balsa to split so take this little extra step.
All of the tail control surfaces are now hinged. I also fitted the clevis for the elevator push rod to the servo. Something that I had not previously done.
Lastly, I started the install of the pneumatic system for the mains. The air tank is secured to the guide tube for the rudder using cable ties. It is a snug fit but works. The air valve and servo will be located to the other side of where the servos in the tray are. I'll use some luer fittings to make some quick connect/disconnect for the wing. They are made of UV-resistant and chemically resistant HDPE plastic that are rated up to 100psi. Plenty for the 80psi I intend to place on the system.