Understanding Delta V from Damage by George M
Understanding Delta V from Damage
by George M. Bonnett, JD
"Voodoo Physics,” "Black Magic,” "Sorcery,” "Wizardry,” and "Witchcraft" are just some
of the terms of endearment that have been applied to the determination of speed from damage. The
calculation of speed change, or Delta V, from damage has been shrouded in mystery for many
reconstructionists. How is it done? Why is it done? How does it work? IPTM’s article,
Understanding Delta V from Damage, written by George Bonnett, may help solve this mystery for you.
The author begins by discussing the limitations and attributes of the Crash3 damage analysis
method of determining Delta V. He then provides you with each of the 16 steps required to determine
Delta V. Mr. Bonnett also includes three different methods of determining the critical
centroid of damage. The errors in two popular and published methodologies are explored and
examined using both mathematics and computer graphics.
In addition to discussing and graphically proving a new method for using both equidistant
and non-equidistant “C” measurements, the author shows you the computer algorithm used for the
computations including centroid of damage. This method removes the mystery surrounding the
determination of Delta V from damage so you can see why crush analysis can be a useful tool
when investigating a collision.
George Bonnett is a combat proven Marine Corps aviator turned police officer turned attorney
turned crash reconstructionist turned software developer and author (REC-TEC). His whole life has
depended on minute attention to detail. In this article, he gives you the benefit of his years of
experience.
Specifications: 22 pages; 8½”x11"; saddle stitched; Publisher: IPTM (August 2005)
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