McHenry Forum - Crash Reconstruction & Simulation

A NAPARS page on Facebook post : Harking back to Episodes 1 (Minimum Speed Equation) and 4 (Ballistic flight / Vault Equation), we can sometimes use them together to find a takeoff speed for a pedestrian or rider in cases where we don’t have the data to solve either of them directly. Imagine a motor...

NOTE: This is a DRAFT : We only spend an hour or so preparing these visual displays of our msmac3D simulation . We set these up when we find something about the crash interesting. We don't have the measurements and other information to perform a full reconstruction. We don't spend additional time t...

I realized I hadn't updated this post so will summarize the many responses: NOTE this topic applies to any and all simulation programs used to support expert testimony. I have changed the identification of simulation programs to ZZZ, and also did not mention companies so those were changed to XXXX a...

Just came across a video with the removal of the vehicle from the building. so added it to some other videos, enjoy!
What goes up, must come down...



For more information on this please also see:

• Car hurled into upper floor of California building

NOTE: This is a DRAFT : We only spend an hour or so preparing these visual displays of our msmac3D simulation . We set these up when we find something about the crash interesting. We don't have the measurements and other information to perform a full reconstruction. We don't spend additional time t...

Another posting clarified the actual problem, and here's my response: I agree that the problem would make an interesting simultaneous equation/spreadsheet analysis investigation. My first (incorrect) impression of the question was that it was about a vehicle struck 4 times in the rear! and rethinkin...

Also see this post related to documents which should be produced:

• "Expert" claiming proprietary work product on simulation files?

Interesting article: Should Expert Witnesses Always Rely on Peer-Reviewed Methodologies? Which begins: Under Frye , an expert’s opinion must be “generally accepted” within the scientific community, whereas under Daubert , general acceptance is one of several factors to consider. Though notably diffe...

Some back and forth on linkedin i'll summarize and my responses below. They mentioned that the expert on the case was no slouch, and my comments weren't about the expert, it was about the technology! The vehicle movements were wrong from elementary physics (if the right side tires are leaving marks...

Added a little more background and links on CRASH to the thread