Watched my Father Inlaw fly my ultimate biplane. Had a very successful flight! YAY!! The last one for the year though.  Got it up and did a few really cool maneuvers and then we heard a high pitched swooshing noise, and the propeller flew off in mid-air! Yeah, so we're not going to be finding that out in the field. But my Father In Law made a great landing anyways! But now I have to buy a new propeller and spinner and some parts for the engine that are long gone. So...until next year...