You can use just about any string or thrread of the correct size. (#8 builders twine would be a bit oversize... [img]i/expressions/face-icon-small-wink.gif[/img] ) I've used Fishing line or stranded steel "Control Line" flying wire.

The Tiger's flying wire rigging pattern can be done in one continuous string, with a rubber band tensioner at the LE of the lower wing inside the fuselage, or in the false fuel tank in/on the upper wing. Because of this, if you plan ahead you can make things quite easy on yourself for hooking the wires up at the field. (for a sport scale plane, competition scale needs the turnbuckles and other details...) Eye bolts on the upper wings, and J hooks on the lower would allow quick connection. A couple of rubber bands and some Christmas ornament type hooks will hold the disconnected wires wrapped over the upper wing and prevent tangling when the plane is dissasembled for transport..