So gave the B60 a cruise stability test and the model exhibited both positive static and positive dynamic stability. Test parameters... ISA, no winds, 4500' msl, half tanks, centered CG, 30" @ 2600rpm. Set a stable cruise after speed settled for the power setting. PIO by pushing the nose down 5 degrees and let go with a fingertip on the yoke just to maintain wings level. The pitch oscillations reduced in magnitude until about 5 minutes later the aircraft was in level flight with no oscillations.