McHenry Forum - Crash Reconstruction & Simulation

Following information recently posted up to INCR on drag factor measurements
a couple of devices/Companies mentioned:

• Vericom and
• Vbox
  • We've had the pleasure of working with the Vbox folks on the 2018 Jaguar E-Pace rollover rollout stunt project
    • great product and great people!

Some information in the INCR thread:

• The Vericom became much more reliable when they included some GPS, (The newer Vericoms correct for pitch. There is a default value built in, which may be changed by the user) so that I had an independent start speed, along with the motion timer.
• A group recently completed a series of skid tests with/without abs on 4 different vehicles (2016 Corolla, 2019 BMW 3-Series, Dodge Charger, Chevy Tahoe) using Vericom, VBox Sport and the newest Racelogic device: VBox Performance Touch. The results are being compiled but preliminary results show all 3 are giving similar results. From the tests done with the same vehicles on this same surface last year (and including a Ford interceptor and Chevy pickup) the ABS f does vary from vehicle to vehicle but the skidding (ABS = off) is about the same.

Some related threads and references:

• 1998 SAE paper Rolling Resistance of Vehicle in Park and various gears
• 1999 NHTSA study ABS Performance over a Broad Range of Surfaces
• 1999 Rolling Resistance of flat or underinflated tires?
• 2005 NHTSA study NHTSA Light Vehicle ABS Performance Test Development
• 2010 SAE paper "Braking on Dry Pavement and Gravel With and Without ABS" for skid test results for multiple cars on the same surfaces"