I did an odd thing this morning. First of all I got up early, that is not a musician's thing to do, but an area bowhunter wanted to show me his new chrono duber. I loaded a lefty marked 54@28 Wing with a B50 endless, a lefty 51@26 Robertson Purist with a fast flight, and my 55@26 'sunset' with a B50 flemish. I shot the same arrow marked at 26&1/4 bop out of all three. Since I do not know how the thing was calibrated the number does not matter, but i shot all three bows twice and my arrow speeds from max to minimum were only 3fps apart with no speed winner. Either my shooting is very consistent and those three bows shoot the same speed or that chrono is stuck.