N56ML's rudder is 3.5" taller than the KR2S plans call for, and has an aerodynamic balance to lighten the load on it. I say that, but the plans don't actually have a dimension on that, you have to scale it (1/4) to get 40.5" tall at the trailing edge. My rudder is a total of 44" tall at the trailing edge.
The plane slips at a crazy sharp angle and drops like an elevator while doing it, so I like my taller rudder. It was added after initial construction by "scabbing" onto the existing rudder with fiberglass, and then overhanging the vertical stabilizer, which effectively gives me even more rudder. You can see it clearly in the photo at the top of http://www.n56ml.com/. You can see from the photo that the rudder is quite proud to be part of the action... Mark Langford ML at N56ML.com http://www.n56ml.com