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Tube sockets are super easy to build from 1/32" soft stock that's been glassed on one side. Kevlar tow (glass, or carbon may be used also) is doped on the outside producing a very strong, stiff and light socket. The second photo shows how light exactly
Third photo shows the second panel being used to mold the LE from 1/16" balsa. The best thing about molded leading edges is their excellent fidelity and radius accuracy. Also, making two identical LEs becomes a trivial matter.
The fourth photo shows sheeting and spars. Spars are bass capped balsa. I didn't have carbon sheet but had 1/32" bass. A little heavier but not terrible
The final photo shows the lightened rib stack. The saving in weight is about 15 grams per rib stack which doesn't sound like much. But when you consider the uncut stack weighed 34 grams, it's about a 40% saving. Ribs 1 and 6 will also take a 1/32" ply cap surrounding the socket.
At this stage, I've got the first set of sheets sanded and ready for the carbon tissue inside. Then I will assemble the first panel.
Taking a quick weight tally I think the panel will build at about 150 grams. Then there are aileron facings and LEs/TEs to add. We'll see where we end up. My plan is to cover with Esaki and paint