In a recent chat with a Strength coach from a major NFL team, he revealed they were using Brower to measure 10 yard dash times. When the coach learnt that magnitudes of performance he was trying to measure was LESS than the error he was getting from using single beam gates, he was shocked.
Lets assume a 1.8 second 10m dash time.
That would be an average velocity of 5.6m/s
Given the acceleration is not linear, lets assume the actual velocity is about 7m/s. So 7 meter per second (or 7.5 yards per second)
Assume your athletes thigh is 0.5m from kneecap to butt.
Near enough to half a yard. How much earlier can the knee arrive at your single beam gate, and trigger a split, than the body would?
0.5/7 seconds, that’s how long. That’s 0.07 seconds… 7/100th’s
That relates to 0.07/1.8 = 4% error!!
With Speedlight the body breaks both beams and this error just does not occur.
Food for thought?