Jaguar E-Pace Rollover Stunt: Notes on Stunt Creation

News, notes, questions on the McHenry invented James Bond Astro Spiral Jump Stunt
Post Reply
MSI
Site Admin
Posts: 1846
Joined: Thu Jun 18, 2009 12:37 pm

Jaguar E-Pace Rollover Stunt: Notes on Stunt Creation

Post by MSI »

msmac3D e-pace2.jpg
msmac3D e-pace2.jpg (56.71 KiB) Viewed 183 times
We had previously posted these notes to our post on the And now decided to split it and create as a separate post:

The following are notes listing important issues we encountered while developing the 2017 Jaguar E-Pace Rollover Stunt. We expect to publish a paper including the detailed technical report we prepared and include the many things we learned from working with the many folks assembled for the stunt.
For now we include the following brief summary:
  • We worked with a 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.
      ......However...
  • The following are 3 major issues we encountered working with the stunt team that Jaguar hired for this stunt (and uses in other stunts) which created MAJOR frustrations:
    • 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.
  • (1) MODIFY THE VEHICLE AS REQUESTED AND IN A TIMELY MANNER!
    • 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
          ...but...
          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?
    • Other examples that 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),
        • It's in the Spiral Jump Patent! (***also see figure 5 below)
        • 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 rolling caster works with the drop ramp and does not affect the vehicle roll and yaw
            • whereas because they wouldn't install one and to try to get things moving we tried with a 'non rolling' ball which scraped and dragged on the vehicle during the launch and caused unfavorable yaw/pitch of the vehicle
        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...(see my "Take a Moment and Relax" Video (also a link below)...
        Then
        ---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 brought back on the team and 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...
      ...so many more tests wasted as they couldn't HIT THE MARK!
  • (3) DO NOT DRASTICALLY CHANGE VEHICLE PROPERTIES:
    • 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),
          We wrote a DETAILED TECHNICAL REPORT for the meeting (which they decided to ignore, wonder if Jaguar ever saw it?)
          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).
          However...
          In 15 or more tests with their earthen embankment landing they smashed and failed
          Why?
          they couldn't HIT THE MARK...

The final performance on the tape (see previous thread) wasn't done live on TV as planned.
  • It was an acceptable jump caught on tape.
    They had issues with practice runs wherein they crashed one of the 'show' cars after they missed the mark and it rolled over on landing.
    They then tried another one (or two) and finally had an acceptable landing..
    However they didn't dare try it again on live TV...Roll the tape!...since...A crashing car is not a good promotion for new car sales!!)
The final run used in the promotion was OK & ACCEPTABLE on tape!
  • BUT...NOT LIVE...it was supposed to be performed LIVE and they also planned other live promotions but they were dropped
Jaguar path.png
Jaguar path.png (109.01 KiB) Viewed 183 times
  • 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 DIDN'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
BUT
  • 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 208 times
Update/Upgrade/Enhance your tools with msmac3D! Lease it, Try it!
LINKS:LEASE pricing!, McHenryForum Index, LATEST TOPICS
Question? Comment? Please email forum@mchenrysoftware.com
(c)McHenry Software ALL Rights Reserved.
Post Reply