McHenry Forum - Crash Reconstruction & Simulation

This Q&A moved from the ECF Thread to here: Q: In the ECF thread you mention "Looking at the Brach book Table 6.2, the listing for the RICSAC staged collision analysis, the value for MU for identical impacts varies arbitrarily" and also present values for RICSAC 9 from the book in Figu...

We moved the following Question and Full Response from the ECF thread since more related to Planar Impact Models: Q: In planar impact mechanics spreadsheet in the Brach book "Vehicle Accident Analysis and Reconstruction Methods" , there are PDOF angles, not correction factors. For example,...

Dug up some of the comparisons of Measured time histories v msmac3D
More refinement and discussion to follow

NOTE: DEC 16 2020: A question on the Momentum "Cone of Departure" came up and we had our response here but decided to split into a separate topic. We are doing an evaluation of a referenced full scale test between a tractor trailer and a pickup truck published in article in Collision - Co...

On another forum in a discussion of the 'cone of departure' referred to in momentum crash reconstructions there was a reference to a full scale test documented in SAE paper 2000-01-0464 . The following is additional information on that paper, the test and the crash reconstruction with sideslap! Here...

Dec 16, 2020 this Question, from another forum, was originally posted to Some Momentum Misconceptions , however once we saw a full scale test on the topic we spun if off to a separate topic. On our response to this thread ( see below ) we posted a video so why not bring it to the top, read through ...

The Coordinate Sign Convention for Vehicle Dynamics as follows: X forward, Y to the right, Z down (towards the earth as in Positive Gravity) The msmac3D , HVOSM and SMAC programs ALL use the same conventions. When HVOSM was first developed in the late 60s space travel was on the rise so they wanted ...

Realized we hadn't moved The Astro-Spiral Jump Patent from old website to the new website so adding it here for now. For those of you who wonder how it was done and/or want to give it a try, here's how: Spiral Patent cover page.png Raymond .R. McHenry, “Spiral Jump Apparatus”, US Patent No. 3,814,02...

Joining Forces on Distracted Driving The blog was co-authored by: Bruce Landsberg , Vice-Chairman, National Transportation Safety Board Lorraine Martin , President & CEO, National Safety Council Which begins... By now, we all should be aware of the deadly consequences of distracted driving . Ye...

Just for fun in response to the Flat Spin 360 Kia K5 Stunt we thought it might be interesting to simulate the real test To quickly create a Simulation of Reality in the event The Universe IS a Simulation! :-) (OK, that's a joke!) For some additional understanding about the stunt Note we have previou...