Flybye,

There are two ways that I know of, one I used to convert a similar aircraft and the other as designed in the Dynaflight Decathlon. The first is to have the wing halves butt into the fuselage side on an aluminum tube (bought from Gator RC). I did it on an 86" w/s bird using 1-1/4" tube. Similar to the asssembly design of the pattern aircraft. Have strong support of the tube sleave at the fuselage wall and separately at the wing root and outer end of the sleave in the wing.

The Decathlon built with the wing halves butted directly together on a similar aluminum tube then installed on the fuselage in the conventional manner.

As I recall, the Fly Baby has a healthy dihedral which can cause a bit of a challenge using a straight through tube. On the one I designed, I had to take some of the dihedral out to accommodate the tube. Flight characteristics did not appear to suffer at all.

Send me a PM if you would like more details.

Bedford