The Reconstructionator LITE:

Computer-Assisted Crush Energy
for Law Enforcement Crash Reconstruction Professionals

Screen Shot 2017-09-12 at 11.47.05 PMSponsored by the CATAIR Prairie Region, this ACTAR-accredited advanced course is intended for intermediate to senior crash reconstruction professionals working in law enforcement or forensic engineering.  It is a hands-on and intensive course offering a deep-dive into advanced crash reconstruction topics beyond momentum. The following computer-aided crush energy methods in crash reconstruction will be covered in detail: Momentum from final rest, Crush from vehicle damage, Energy & Force balance as well as inclusion of EDR data to refine speed calculations.  Attendees are welcome to bring complex crashes to the expert round tables in order to refine the solution.

Course Location & Dates

Date & time
November 13-15, 2017
8:30am – 4:00pm

Renneberg-Walker Engineering Associates Ltd
9320 49 St NW
Edmonton, AB, T6B 2L7

$875 for CATAIR members
$950 for non-members

Register now >>


Reconstructionator LITE course location

Learning Objectives


By completing the course, participants will:

  • Refine their capabilities in the multiple facets of crash reconstruction by applying engineering and physics principles to the available physical evidence;
  • Be trained to use a powerful computer-based application to reconstruct collisions more efficiently and with greater certainty in comparison to traditional hand-calculations.

Course Description



By learning advanced methodologies of crash dynamics such as momentum and energy together, experts will gain a detailed understanding of linear and rotational pre- and post-impact speed and speed change calculations. The incorporation of EDR data allows for further refinement of speed calculations.  The benefits, limitations and effects of each method are carefully explored.

Most importantly, the instructors will tie everything together by demonstrating how to integrate the results and data from several methods, sources, and the available physical evidence by using a simple yet versatile tool: The Reconstructionator.  Participants will be trained on how to properly use this tool in their analysis, through several case examples and discussions.

The Reconstructionator is an ExcelTM – based customized application that estimates, based on physical evidence, crash speeds and vehicle dynamics primarily using the following principles of physics and any available electronic data:

  1. Momentum (linear and rotational from the area of impact and vehicle rest positions)
  2. Energy (vehicle crush damage and automated stiffness coefficients from crash tests)
  3. EDR or Telematics data (Recorded pre-impact and/or speed changes)

Course Agenda

Day 1: Newtonian Physics Refresher and Overview of Crash Mechanics
  • Motion, Work, Force, Impulse (8:30 AM – 10:00 AM)
  • Momentum and Limitations (10:00 AM – 12:00 PM)
  • Momentum and speed calculations in the Reconstructionator (12:30 PM – 2:30 PM)
  • Intersection crash case examples (2:30 PM – 4:00 PM)
Day 2: Energy, Crush and Stiffness Coefficients
  • Interpreting crash test data (regulatory and vehicle-to-vehicle) and Limitations (8:30 AM – 10:00 AM)
  • Energy, crush deformation and Force Balance (10:00 AM – 12:00 PM)
  • Automated stiffness coefficients in the Reconstructionator (12:30 PM – 2:30 PM)
  • Head-on crash case examples (2:30 PM – 4:00 PM)
Day 3: EDR Data, Validation, and Reporting
  • Speed changes from momentum and energy (8:30 AM – 9:30 AM)
  • Real-world crash test data and the Reconstructionator results (9:30 PM – 11:00 AM)
  • Inclusion of EDR data to analyze pre-impact yaw rate, crash pulse, delta-t, peak and average crash accelerations (11:00 AM – 12:30 PM)
  • Additional variables to be considered: Restitution, tire forces, in different scenarios and crash configurations (1:00 PM – 3:00 PM)
  • Reporting results, assumptions and error in the Reconstructionator (3:00 PM – 4:00 PM)

Course Audience & Pre-requisites

This advanced course is intended at intermediate to senior crash reconstruction professionals working in law enforcement or forensic engineering.

This 3-day course builds beyond the fundamental technical knowledge and skills required for crash reconstruction. Attendees are required to have:

  • Previous experience with: interpreting physical evidence resulting from traffic crashes, crash investigations, crash analysis, motion analysis, and linear momentum calculations.
  • At least some basic experience using Microsoft Excel is necessary.
  • A science or engineering degree, or level 4/5 Crash Reconstruction Courses with ACTAR or similar accreditation.

Attendees are encouraged to bring a laptop and/or computer tablet with Microsoft Excel installed.


Teaching Team


Sam Kodsi, P.Eng.
Primary Instructor

Sam Kodsi, P.Eng. is a Crash Reconstructionist and the President of Kodsi Forensic Engineering. He is a registered Consulting Professional Engineer (Mechanical) in Ontario and a Certified CDR Analyst. Mr. Kodsi became active in automotive engineering safety including seatbelt effectiveness using biofidelic crash test dummies in 1995 and began specializing in Crash Reconstruction in 1997. Over the last 20 years, Sam has been involved in more than 5,000 motor vehicle collision reconstructions and has testified 67 times as an expert witness in all branches of Ontario courts. Sam is a published author (SAE and ARJ) and volunteers to peer review other international research prior to publication. His continuing education includes a master’s course in Vehicle Dynamics at the University of Illinois and diplomas/certificates in Advanced Crash Reconstruction at the University of North Florida and Human Factors in Vehicle Crashes at Northwestern University. He has a passion for testing, advancing further research and educating. He has been leading lectures and seminars on crash reconstruction, driver behaviour and forensic injury biomechanics for law enforcement, legal, insurance, medical and other professionals for the past 10 or more years.

Course Registration

Interested participants must register for the course through CATAIR Prairie Region. To register, click the button below to download the registration form, and send your completed form to Martin Davidson (CATAIR Prairie Region Treasurer) by email at or by mail to #34, 11410 – 27 Street S.E. Calgary, Alberta T2Z 3R6.



For any questions related to the November 13th course in Edmonton, contact Mark Sawa of CATAIR or by phone at 780-461-7613.

For, general inquiries about the Reconstructionator or Reconstructionator LITE courses and software, contact Kodsi Forensic Engineering at  

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