Just finished weighing the right wing, after removing it from the bag system.
Now this wing has:
phenolic tube support, phenolic tube, spar extensions, root ply cap, & top and bottom sheeting
weight is 13.61 ounces at the tip
and 25.25 ounces at the root
total weight so far is 2.42 pounds.
I also had weighed the balsa sheeting before using it and it was 6.17 ounces for the top and 6.01 for the bottom = 12.18 ounces
let's see if it all adds up
21.625 + sheeting 12.18 ounces = 33 ounces, without the glue
total wing weight is 38.7 ounces
38.7 minus 33 ounces = 5.7 ounces
so according to my calculation, the glue weight is 5.7 ounces total, for one wing
so this is very much in line with what I thought, of about 3 ounces per side.
on another build, when I had done this step, using polyurethane glue, and the 48" carbon square rods, the weight was at 2.5 pounds.
So so far, I do not see much of a difference, I am stumped!
the big difference, was, that using the bag technique, i did not do any heavy lifting.
SO makes me wonder, If you use poly-urethane glue, does it "evaporate" to some extent, and lose its water weight as it cures?
I know I had used 6 ounces per side, and thus 12 ounces. SO I would have expected these wings to be much lighter.
This is called a paradigm shift!