Coolbean, I see you are in Liberty, MO... I'm not sure exactly where that is in Missouri, but is it possible you were seeing an agricultural aircraft making an application to a field? I know there's still a little spraying going on up there this time of year. You probably would have seen him pulling up and making what would appear, to anyone unfamiliar with ag flying operations, a turn like you described if he was light. About the only biplane left that is used in ag ops is the Grumman Ag Cat. It has straight wings, but a short fuselage. Myself, and a lot of other ag pilots will make very short turns at the end of a pass, after the load starts coming off and the weight is not such a factor. It involves a pull up, 45 deg. turn, then a 225 deg. turn in the opposite direction to line up for the next pass. About halfway through that turn, you start your decent back into the field. That all happens pretty quick, and at the top of the turn when you start back down, it looks as though the aircaft stalls, but it doesnt. You said the aircraft had a longer fuselage, so it probably wasnt an Ag Cat, but I thought it might be a possibility.