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Jaguar E-Pace Rollover Stunt Designed by McHenry with msmac3D

Posted: Thu Jul 13, 2017 4:23 pm
by MSI

Above msmac3D and Jaguar E-Pace Rollout(30 sec)

Re: Jaguar E-Pace Rollover Stunt Designed by McHenry with msmac3D

Posted: Thu Sep 07, 2017 3:47 pm
by MSI
Her's another video with Preliminary msmac3D simulations and 3D graphics

Re: Jaguar E-Pace Rollover Stunt Designed by McHenry with msmac3D

Posted: Tue Jan 12, 2021 10:25 am
by MSI
We had posted the following comments to a our recent post on the However we now post it here:

From our experience working with the stunt team behind the Jaguar E-Pace rollover stunt we would love to try working on the design and preparation for a stunt with a different stunt team like the Father/daughter stunt team that did the Kia flat spin 360 stunt!

Someday we expect to make public our detailed technical report on the Jaguar stunt creation experience.
  • To include all the great things accomplished with the great team assembled by Will Roberts for the project:
    • StarEvents UK who were professional, responsive to all fabrication details on ramp, etc,
    • vbox for immediate and excellent vehicle dynamic measurements,
    • bagjump for the landing bag which allowed tweaking of the takeoff to get the proper trajectory,
    • vehico with a great automatic driver for preliminary testing,
    • and many more!
      It was a great project working with all these companies and people.
  • To provide a list of IMPORTANT ITEMS that must be communicated to and provided by the stunt team.
    • The stunt team that Jaguar hired for this stunt (and uses in other stunts) were a MAJOR frustration:
      • they left to the last moment all vehicle preparations, they didn't prepare the vehicle as requested, and this caused many delays, mistakes and problems which wasted time and drove up costs.
    • For example
      • On more than one occasion NO CHANGES to the vehicle were made prior to the stunt test date
        • So I and ALL the others arrived (I had to travel from USA to UK! Others from other places) and WE ALL sat around for a day or more as they worked on the vehicle
          • In modern cars it is IMPORTANT to be sure to disable anti-roll and other stability items
            • They need to be disabled since we are rolling and spinning the vehicle!!
            Jason Arst was our main vehicle dynamics components check person
            He told them the many items to disable and check
            they didn't do ANY of it until we were all there so wasted time and tests while we worked to disable
        • SO added costs and wasted time
        • why not either DO THE WORK beforehand or DELAY the date of the test?
      • Another example of wasted time and budget:
        • Rolling Caster: We asked for and needed a rolling caster attached to the vehicle (a not so secret component of the stunt),
        • They never installed a caster per our insistent and repeated instructions
          • we gave them one to install, they didn't even try to install it!
        • So the early tests were a waste of time and money as they did not work well
          • the caster works with the drop ramp and helps control the vehicle roll and yaw

          and so after a half dozen or so bad tests...
          • the obnoxious ADman in charge foolishly kicked me off the team and assigned the task to the clueless stunt team
            They chopped up parts of the ramps and blindly tried to get it working (without the required caster!)...
            So...I had a brief pause...(no point me watching them try to figure out how to do the stunt w/o a caster)
            • ...I was at the track in Bedford, UK which had a lovely natural area behind the stands away from the activity...
              so i relaxed and filmed some snails taking life with grace and serenity...
          ---with help of my main contact in UK we went and got a caster fabricated to add to the vehicle (amazing fast work by the fabricators of StarEvents!

          ......and after a couple of failed attempts by the stunt team to make the stunt work without a caster...
          we were allowed to install the caster on the car, repair the ramps back to my specifications, and run a test
          the stunt worked as predicted and expected!
    • (2) HIT THE MARK a stunt driver needs to be able to "hit the mark":
      • In any stunt or maneuver there is a sweet spot or target location that the vehicle must pass as close as possible to in order for the stunt to work properly.
        • ESPECIALLY for a precision stunt like the spiral jump.
        • The original stunt was part of a touring traveling thrill show so the mark was not that precise BUT it must be within +/- A FOOT!!!
        • There were many runs by vehico automatic steering which HIT THE MARK and looked good, but then...
          • a bunch of wasted runs with the stunt driver who COULD NOT HIT THE MARK!
      • We suggested maybe try drive by wire or some form of a light signal to help guide to the sweet spot...NOPE...he refused... many more tests wasted as they couldn't HIT THE MARK!
      • This is an extremely important MAIN POINT...
        Once a vehicle/simulation is synced and worked out DO NOT radically change the vehicle!
        • ANY changes to the vehicle suspension will change the vehicle launch trajectory and so change the path of the vehicle in flight particularly in a stunt like the spiral jump.
          • The spiral jump stunt dramatically bottoms out the suspension on the up-ramp as it rolls the vehicle rapidly to spin 360 degrees from launch to landing.
          • Vehicle properties, particularly the suspension, are EXTREMELY IMPORTANT!
        • After the final preparation tests ended late one night (11 PM!) we spent all night comparing and syncing the 2 tests
          • The tests were extremely consistent in their vehicle vbox response measurements) and we had the simulation matched up
          • We used the simulation to determine the optimum location for the landing ramp for the FIRST ramp-to-ramp test (which HAD to be run the next day)...
        • The stunt team secretly and foolishly made significant changes to the suspension!!
          • Made it stiffer with tape wrap, etc which they later said was "to soften the landing"
            ...which begs the question...
            • the test was without a driver as we used the vehico automatic driver so why soften?
            • and they did this without saying a word, without discussion?
              Why not let us know since
            we would have said NOOOOOOOOOO!!!!
        • The stiffening of the suspension caused a change in the vehicle trajectory in the air such that it veered to the left about a foot or more and so caught the edge of the landing ramp and crashed.
        • More wasted time and money!
          • In a meeting after that test (we were not invited, however we did write a DETAILED TECHNICAL REPORT for the meeting which they decided to ignore)
            The stunt team convinced the obnoxious ADman in charge to once again drop me and let the stunt team blindly mess up the landing (which they did!)
            I did not participate any more in helping them make for a proper landing
            the stunt team took over and switched to a tacky dirt pile landing placed no doubt at the location where i told them to for the first ramp to ramp test (and probably returned the suspension back to original configuration).
            In dozens of tests they smashed and failed as they couldn't HIT THE MARK...
          • The final performance on the tape (see previous thread) wasn't' done live as planned (it was an acceptable jump caught on tape, they didn't dare try it live)
The final run used in the promotion was OK & ACCEPTABLE on tape!
  • BUT...NOT was supposed to be performed LIVE and they also planned other live promotions but they were dropped
  • The takeoff and flight was beautiful based on our design and setup
  • The landing was hard due to the stunt team dirt pile landing area and because they couldn't HIT THE MARK!

Would love to try working with another stunt team to demonstrate how a stunt team using simulation can take some or all of the guesswork out of developing a stunt and SAVE TIME and MONEY
  • only if the stunt team works TOGETHER not AGAINST the simulation team and follows recommendations and DOES NOT SECRETLY change the vehicle before a test.

***...shhhh...don't tell...A secret of the astro spiral jump...from Patent 3,814,021, Figure 5! (It is essential for the stunt!)
Part of Fig5 from spiral jump patent.png
Part of Fig5 from spiral jump patent.png (51.5 KiB) Viewed 1545 times