I didn't physically measure prop diameter but the hub says 5 x 4. What it may lack in performance against customized props seemed to be compensated by its durability. Hence a "rubber ducky" moniker. I remember now I used to run a narrow blade T/F 5.25 X ?? white Nylon w/ red markings that worked well but ruined blade root area with the electric starter and was looking for a replacement...

From memory: I have a couple 4.5 x 4 molded in neon yellow I got from Cox International that may be why the engine seemed very happy with (when it had the large-bore venturi) but never seemed to pull this airplane with authority.

Fuel line was purchased at a hobby shop counter when they sold the stuff by the foot a long time ago so I don't know what brand.