McHenry Forum - Crash Reconstruction & Simulation

Here are the redacted conclusions from our initial report to which the pc-crash expert wrote the aforementioned rebuttal report: and note line feeds added for readability SUMMARY AND CONCLUSIONS The PC-CRASH program includes a simplifying assumption of an instantaneous exchange of momentum. In real ...

WHY Use Simulation to “Test and Refine” Traditional Crash Reconstruction Results This topic is a follow-up on some other related topics: Should an Expert Rely Solely on PC-Crash for an Opinion? Simulation Analysis: Effects of Input Variations Classic Example of Sensitivity of Momentum Solutions The...

March 2024: Interesting coincidence. Earlier this year we were contacted by Chris Distin who's written a book on the movie with the stunt And the interesting coincidence: From the book a few items: The jump was filmed on the 1st of June 1974 , the 31st day of movie production. The patent had been a...

March 2024, Ray is 95 and healthy and doing great.

• Unfortunately in June 2023, Connie, his wife and my mother, passed away.
  • Constance McHenry Obituary

March 2024: edited updated and added the graphics

March 2024, added mention and link For restitution effects, please see Effects of Restitution on the Application of Crush Coefficients for details on effects of restitution, which "reduces the residual deformation while increasing the total impact speed change". In this forum topic, we foc...

Q: The argument behind the idea that we're getting to dV from damage and stiffness (and, of course, BEV) made me hesitate...maybe I read stuff wrong before and it IS dV we should be using. But, by my way of thinking, if I work it all the way back to Emori, for example, the input was always the spee...

Q: (Posted to a Facebook forum) Can anyone here share a rollover formula? A: One of the responses was: During WREX 2016 a presenter gave a presentation on a new rollover formula. S=sqrt 13(d). The distance is from trip to final rest. I have used it several times and get within 5mph of the minimum sp...

Q: Got into a discussion with someone and we ran into a "conundrum." It has to do with a reading of the various papers and such as it relates to stiffness coefficients. So say we have a set of crash test data and we want to find stiffness coefficients. The discussion hinges on the velocit...

4.5.5 uploaded!