At this point the installs were complete!!
I ordered a 50mm carbon wing tube from Graph Tec RC.
http://www.graphtechrcshop.com/produ...&categoryId=24
They were nice enough to cut it to the correct length for me.
The aluminum tube weighed 1 pound, 6.3 ounces (22.3 ounces).
The carbon tube of the correct length weighed 12.8 ounces, a savings of 9.5 ounces.
I wanted to mention the length of the stock wing tube. I had my carbon tube cut to the exact length of the stock tube. My tube was about 10mm too long. I contacted Andreas. He said the wing tube may, indeed, be too long. He does that to ensure it is never too short, doesn't quite reach the plywood rib at the end of the wing tube socket in the wing, and the result is a wing failure. Removing the little bit of extra length is easy to do and the pilot is confident the wing tube reaches to the end of the socket in the wing.