I was looking at these... Sullivan Composite Flex Rod 4-40 48" (1) at Tower Hobbies. They do not change with temp. and are carbon filled nylon. The carbon content is however low enough that the do no cause rf noise. I fly Futaba 12fg radio on all my models and rf noise is always a concern . I have over 30 planes but still would hate to loose one of them. What do ya think? Have you guys tried these? I always mount small ply tabs about ever 6" through the fuselage to support the outer tube.