What size pattern plane?

I used 4-40 on both of mine, where it was called for. The Excelleron 90 uses pull-pull for both the rudder and elevator so the only place for the rods were on the ailerons, where I did use the larger size rods. They were threaded on one side and I soldered on the other side.

The Venus II also has 4-40 rods for the ailerons, but I used Sullivan Carbon Composite flex rods for the elevator, a pair of them side by side, and one of their large ones for the rudder. The tube has been secured in several locations along the inside formers. Very sucure and responsive.

CGr.