Here's the 2012 Sportsman routine flown in an RV-4 with inverted fuel and oil from left wing view point. http://www.youtube.com/watch?v=nCBww83aHds I have other youtube videos approaching the limits of the RV capabilities, but didn't even attempt the maneuvers until I had several hundred hours of acro experience. Definitely agree with Frank about not enough rudder, and I don't snap the RV since it's not structually designed for that. That keeps you from going into Intermediate level, but that doesn't mean you can't fly most of the Intermediate maneuvers using a Free style in Sportsman. I'm working on a Sportsman free style that sequence that highlights the attributes of the RVs which are speed and vertical up lines.
Bill
RV-4 slider