I seem to recall 22K or so with the OS91. We used a fish scale, which was just a spring with weight markings on it, hooked to the back of the plane. 10 pounds was about the best I could get, but I fly at 5000' altitude. I usually went slightly on the larger side on the outlet for more static thrust for easier takeoff and climb out due to the altitude. I also seem to recall 110% to 115% inlet area, but maybe that is just my failing memory?

Scott