At last years F3A Eurochamps Christophe had an additional piece of thin ply glued to his rudder to create a "T" shape when you look down on it. His original rudder trailing edge was thin (about 1/16 - 3/32" ) and the bit of ply took it out to around 3/8" I would say. He wasn't around to ask but I presume this would give your rudder the aerodynamic characteristics of a rudder with a trailing edge thickness of 3/8?

In Romilly this year BPLR had something similar on his rudder but it was out to about 1/2" and it was faired in. Why not just build a rudder with 1/2" trailing edge thickness?

Apart from a bit extra drag and a softer feel around neutral what does a thicker trailing edge give you?

Thanks,

Angus