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New world record with an electric racing car: From 0 to 100 in 0.956 seconds

ethz.ch

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Re: New world record with an electric racing car: From 0 to 100 in 0.956 seconds

#71

Post by lucgommans »

tzot wrote: post #22
hprotagonist wrote: post #10

how many gees is that?

$ units You have: 100 km per hour / 0.956 sec You want: gravity * 2.9629132 / 0.33750567

Protip: no need for a dedicated unit conversions utility, this awesome calculator has it built in:

    $ apt install qalc
    $ qalc
    > 100 km/h / 0.956 s to gee
      (100 * (kilometer / hour)) / (0.956 * second) =
      approx. 2.9629132 gees

Re: New world record with an electric racing car: From 0 to 100 in 0.956 seconds

#72

Post by rjmunro »

mrb wrote: post #56
rob74 wrote: post #28

Earlier quoted context omitted.

Thanks! I was about to ask how many Gs this translates too, my physics are a bit rusty...

In GNU units you can just do: $ units -t '100 kph / (.956s) / gravity' 2.9629132

That query works in Wolfram Alpha too: https://www.wolframalpha.com/input?i=100+kph+%2F+%28.956s%29...

Re: New world record with an electric racing car: From 0 to 100 in 0.956 seconds

#73

Post by hedora »

tekla wrote: post #46
cogman10 wrote: post #38

Could we maybe change the title here and change it to 100mph? I realize this is the original article title but EV + 0 to 100 led me to believe the article was talking about battery charging speed.

Who the hell would think that a 1s battery charging time with a racing car would make any sense at all?

Pit stop times matter, and supercapacitors exist.

I'd love to watch that race, especially if the cars were sucker cars like the one in the article, and the drivers got to wear high-G fighter jet suits.

The best supercapacitors apparently have 20x the energy density of the best batteries. Apparently, self-discharge can be as low as 20% per day, which rounds to zero for racing. They only cost 10x more than lithium batteries, which again, for racing rounds to zero. Discharge current blows lithium-ion so far out of the water that I couldn't find a rule of thumb ratio.

https://supercaptech.com/battery-vs-supercapacitor/

edit: I had the energy density backwards; supercapacitors are at 10% the density of lithium ion. Still, the other advantages stand. I wonder how hard it would be to add an inductive charger to a straightaway...

Re: New world record with an electric racing car: From 0 to 100 in 0.956 seconds

#74

Post by bborud »

elmerfud wrote: post #4

The impressive thing to me is the level of traction needed to do something like this. It seems they're taking old tricks and building a "sucker car". https://www.roadandtrack.com/motorsports/a32350/jim-hall-cha... Still neat stuff. Race sanctioning bodies will need to update their rules or these will just be one off bragging rights.

Then there's the Brabham BT46 "Fan car" that actually raced in F1. Once. Before it was banned. :-)

https://youtu.be/B294RfWj1QE?si=jxYpIgwtH44at6Bq

Re: New world record with an electric racing car: From 0 to 100 in 0.956 seconds

#75

Post by madamelic »

xwowsersx wrote: post #60
mattferderer wrote: post #51

Out of curiosity, what's the point of a driver in something like this besides to have a human in the vehicle adding weight? Are they doing much? Serious & maybe very ignorant question. - Edit - For clarification, my reason for asking was due to this occurring in less than 1 second. I don't understand what the driver does as I'm assuming they have no gears to shift or turns to make.

I assume it's because racing, as a sport, is a lot less interesting without the variable of a human with particular skills operating the vehicle. I doubt crowds would be as interested in watching cars race on autopilot, though it'd still be kind of cool, I guess.

> racing, as a sport, is a lot less interesting without the variable of a human with particular skills operating the vehicle.

If full self-driving gets much better, I think it could be fun to see this happen. It would be like a hackathon with teams swapping out and improving on strategies through laps. The qualifiers could happen on electric miniatures then the final round would get a full car to race on a track.

Re: New world record with an electric racing car: From 0 to 100 in 0.956 seconds

#76

Post by londons_explore »

I think hub motors like this are the future. Frees up space under the car for more battery. Removes the complexity of drive shafts and universal joints. Gives software full traction control. Reduces design time for new vehicles (just route a power and data cable to a wheel and you have a vehicle). Is the first step to all-electric braking.

The downside is more unsprung mass. But modern motors are getting lighter and lighter. And without a drive shaft, wheels could do crazy things like moving in and out to avoid potholes, or dynamically adjust camber to match the road you're on.

Re: New world record with an electric racing car: From 0 to 100 in 0.956 seconds

#78

Post by jbm »

tsunamifury wrote: post #57

On a related note in the sports car community its been interesting to watch Acceleration stop being a mark of a performance car. There is even a lot of chatter around this being the end of the supercar segment since there are family wagons that can now do 2 second 0-60 runs. On top of that the speed is now too much for anyone to reasonably use off a drag strip or circuit. Now there is a huge emphasis on engagement, d…

We see this same sentiment in comments on this very website. Comments like "Straight line acceleration doesn't matter", for example.

Except, as a driver, I never accelerate in a tight curve. Once I got an EV, aggressive drivers were no longer able to block me from merging into traffic; if anything, I was able to easily get away from them if necessary.

I believe what we are seeing is car enthusiasm being pushed further into the long tail. Aesthetics, self-sufficiency through repair, exotics, etc, will always have a place, but speed off-track is over. ("Drive feel" is the new "gold cable connectors".)

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