Very good report, Bill

The Nimbus 3 and the Genesis 2 have very small *tip spoilers*, in addition to
normal differential ailerons. They seem to work by add a bit of drag, way out
near the tip and help counter the adverse yaw. They are about 4" X 18" and move
up twice as fast as the aileron, so that full aileron gives a spoiler standing
up at 90 degrees. The early Genesis 2 had these tip spoilers actuated by the
rudder pedals, but later models used the stick to actuate them. The return
spring used on the tip spoilars gives just enough input to keep the stick
centered. I like that because I know the stick is perfectly centered, by just
relaxing my grip, a tad.
JJ Sinclair