McHenry Forum - Crash Reconstruction & Simulation

Recently came across this poster I had saved to my phone back in 2017 which was created by Jaguar on the stunt. I now actually looked at it and some interesting items:

• 765 hours of 'engineering simulation time'??
  • what's that all about? simulation & engineering time?
  • The simulations we performed were at max a week of our time so 30-40 hours max
    • and then the actual simulations are faster than realtime so of that 30-40 hours manpower time, maybe 5 min total actual simulation time??
      • The rest of the time it was review, refine, check, compare...etc
    • There was a lot of wasted time traveling and standing around waiting on the stunt team to modify the vehicle (we told them to do many things pre-test time but they didn't so a LOT of wasted time)
      • Also,the early tests were with a 'non rolling' device instead of caster because the stunt team would not/did not install a rolling caster (we even gave them one to install...but they didn't/wouldn't)
    • see discussion for notes on the stunt creation
  • Wonder where'd that "765 hours" came from?
• 10 mm margin for error??
  • which they characterize as same diameter as a drawing pin??!!
    • ahhhh...maybe that ruler was in inches...they assumed it was metric/mm? 10 inches or so is about the correct margin of error...
    • maybe 10 mm for the scale model stunt! see the Spiral jump patent from 1974!
    • basically the stunt driver had to hit within 6" to 1 FOOT of the sweet spot which the Jaguar stunt driver couldn't do...
      • The initial test run at the London’s Excel convention centre one of the stunt assistants/understudies nailed it with soft perfect landing!
      • But then the main stunt driver couldn't hit the mark and repeat it and so it wasn't done live
• 33 barrel roll tests
  • yes...there were...
    BUT
  • We only participated in maybe 13 of them
    • The tests we participated in were
      • wasted because no rolling caster (6 tests)
      • or with driver missing mark into bag landing (3 tests)
      • and (back to auto steer) only 3-4 tests were required to get the takeoff and roll correct and with simulation predicted landing ramp position
      • However because of a "secret change" by the stunt team to the vehicle suspension before the first ramp to ramp jump, it failed to land properly (see notes)
  • So then we were dropped from the team and the stunt team blindly wasted 19 tests!! trying to hit the mark and get the landing right on a dirt embankment
    • We could have easily helped them and accomplished a consistent landing in a few runs had they used us and maybe used some things to help the driver 'hit the mark'!) (lights? drive by wire? guide rails to ease car to sweet spot?

• The time and Gforce items i will have to check into and get back to you on...

Be sure to see

• Jaguar E-Pace Rollover Stunt Designed by McHenry with msmac3D
• Jaguar E-Pace Rollover Stunt: Notes on Stunt Creation