ORIGINAL: dflynt

I received a ZNLine Supreme kit last week. I would be grateful if anybody could answer some of these questions:

1. Where should the CG be located?

I'll have the best answer soon. Marco will probably give Troy the best answer though.

2. I would like to mount one servo in each stab half. Set up this way, will the plane balance near the CG with a YS DZ140 and hyde mount, or will it be tail heavy?

Current experience says that this will be tail heavy. Tray mounted servo(s) are the way to go. Keep the tail light.

3. The stab has a balsa block insert in each stab half, with a hole that is cut to fit a gator rc phenolic tube socket. I want to use a PBG carbon fiber tube and socket, but the socket is about 1.5 mm less diameter than the hole in the stab halves. Any ideas how to build up the PBG carbon socket to fit the hole, without adding much weight? I was thinking about a wrap of light fiberglass cloth, and epoxying that in place.

Jig your tube set-up so that the tube will be horizontal to the table at the proper height so that when the stabs are in their saddles flat on the table the tube centers in the holes. Using a thick epoxy/microballoon mixture, fill your holes and slide the stabs onto the tube. Use a ruler along the elevator cut-out to ensure the stabs are straight in line. Let it dry and remove from the jig. ENSURE TO WAX THE TUBE. Please look for the thread in this forum entitled ZNLine Factory; Enigma Building for photos and further descriptions on the stab socket installation. I think the photos of the jig and descriptions will give good information there. I prefer the sockets to have a little play and use a jig to mount them for really nicely aligned pieces after all is glued up.

4. What are the two round balsa plugs to be used for? They are about 3/8 inch thick by 3/4 inch diameter.

Those are end caps for the wing tube sockets.

5. There is a short piece of carbon fiber socket that fits the wing tube, that must be intended to support the wing tube in the fuselage. But the fuselage already has the tube socket supports molded into the fuse. I don't understand how or whether this short piece of carbon fiber tube socket is to be used. Anybody know?

Cut that piece so it fits nicely between the molded in sockets. Slide the wing tube through (wax the wing tube). When your wings are properly set against the fuselage and you are happy with the wing-root/fuselage mating, wrap a piece of light-weight glass (about 1" wide by 4" long) a couple of wraps around each socket/socket joint and impregnate with epoxy. You shoud have your incidence set and wing attachments done so that when you glue in the socket all stays perfectly in place.

BTW, the kit is beautiful. The fuselage is the best I have seen. It's hard to imagine how to improve the quality of these kits, but they keep getting better. The seam is absolutely level and perfect on the top and bottom. There is about 1/10th of a millimeter of flashing along the seam to sand down. There are absolutely no chips or bubbles along any of the sharp edges. There are no voids between the cloth and primer gel coat. It's almost ready to paint as is.