Zipline Braking 4-minute Spring Installation--Momentum Engineering

For over seven years, I have investigated over 60 Plaintiff aerial adventure ride (zip line) braking accidents, so please consider my evaluations, analogies, and suggestions for the industry standards of zipline braking. ("Zipline Injuries on the Rise," Bush & Richardson. 2016) https://www.hg.org/legal-articles/zip...

Over 50% of all zipline braking accidents are braking-related. More often than not are heavier zipliners (more massive) speeding past 6 mph. The colder the zipline the faster the zipliners, because a 1/2-inch steel cable shrinks two inches every twenty degrees, thus reducing the curvature.

The ACCT standards say an emergency brake is needed when a participant arrives below 6 mph. But, the momentum (energy generated) looks at various zipliner (participant) weights (80-160-240 lbs.). More weight, now you have more energy to stop. Now add 20 mph zipliner speeds (gravity=acceleration=m/s^2) to the belly (lowest point) of the cable, and the zipliner is going uphill, the three zipliners can generate (350-700-1050 kg*m/s) energy. So, predicting the speed of everyone's arrival (e.g., 6 mph) is impossible. Because every zipliner has different variables (e.g., mass, surface area, positioning).

I am asking the standards to test several zipliner weights so the zipline can document the test data to ensure every zipline with an arrival speed over six mph must have an emergency brake.

All ziplines must test their arrival speeds often and with maximum zipliner weights.