DON"T DO THIS!
There's a variation of the thing we did as a kid called ghostriding where instead of the bikes we jumped off of while they were moving, they jump out of cars that are moving.
This is a "sport" for the stupidest of the stupid and I don't condone it at all. However, a variation of this where you leave somebody behind the wheel and have a participant, properly trussed up in protective gear, dismount from the back of a vehicle going 50, 80, 100 mph or more to try to stay on his feet and slide as far as possible might be a balance of danger and entertainment that I could get behind.
That being said I'm not sure if there's a combination of helmet, elbow and knee pads, back braces etc that could protect somebody loosing their balance while they slide along the pavement at 120 miles per hour.
One way to find out I guess.-- doctorremulac3, Jun 05 2019 Sort of... https://www.drivesp...ycle-1526544820.jpgPeople hang on to the back of their motorbike with titanium (I think) on their boot-heels. [neutrinos_shadow, Jun 05 2019] If it's a reasonably flat road, you really only have to worry about friction. You want something which:
(a) doesn't have too low friction, or you'll skid a long way (b) doesn't have too high friction, or you'll roll instead of skidding (c) can absorb your kinetic energy without wearing through (d) through ablation or insulation, doesn't transmit all that energy as heat to your skin.
An 80kg person travelling at 120mph needs to dump about 120kJ of kinetic energy. That's a trivial amount of energy.-- MaxwellBuchanan, Jun 05 2019 (e) And sparks. The protective boots should throw lots and lots of sparks.
I suppose if you wanted to be a sick cookie you could have the protective areas of the suit, knee pads, helmet etc. throw sparks as well just in case.
Hey, if you've gotta wipe out, might as well make a show of it. Let's face it, anybody who would pay to see such an event wouldn't exactly ask for their money back if there were a disaster.
Just sayin'.-- doctorremulac3, Jun 05 2019 It was a stupid thing to do but I was once with some people who had a person lay on top of the car roof, gripping it tightly at the unrolled windowsides as the car drove along
...and I tried it ...and it was fun-- beanangel, Jan 02 2020 Wasn't there a Mythbusters episode where they showed that it was impossible to shake off someone clinging to the roof of a car, even if the windows are rolled up?-- notexactly, Jan 03 2020 there are numerous roller skate skiis-- theircompetitor, Jan 03 2020 Most humans require no more than two.-- 8th of 7, Jan 03 2020 Sounds like some sort of horizontal practice catapult is needed.-- wjt, Jan 04 2020 random, halfbakery