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

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

#211

Post by westurner »

HPsquared wrote: post #104
underlines wrote: post #91

Earlier quoted context omitted.

radicalbyte, you're absolutely right that the use of fans in Micromouse increases the traction, and therefore the speed at which the maze is solved. Suction allows for impressive performances. However, a small caveat that might be worth considering is that while the suction indeed increases speed, it might be more accurate to say that it primarily improves acceleration instead of car speed: The issue often lies with…

Speed = ∫(acceleration) dt

Derivatives of relative displacement as defined by a distance metric in a [e.g. metric tensor] space:

  Length = Point2 - Point1
  Length * Time^-1 = Velocity or Speed
  Length * Time^-2 = Acceleration
  Length * Time^-3 = Jerk
  Length * Time^-4 = Snap or Jounce
  Length * Time^-5 = Crackle
  Length * Time^-6 = Pop
Displacement (geometry) > Derivatives: https://en.wikipedia.org/wiki/Displacement_(geometry)#Deriva...

Fourth, fifth, and sixth derivatives of position: https://en.wikipedia.org/wiki/Fourth,_fifth,_and_sixth_deriv...

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

#212

Post by timc3 »

AtlasBarfed wrote: post #202
adfiognionio wrote: post #147

Earlier quoted context omitted.

This is really quite wrong. Performance car /= sports car. Sports cars are light and nimble by definition. They are usually fast, but this is not a rule. There have always been sedans that are faster in a straight line than most sports cars. There have always been sports cars that are not very fast at all. None of this is new, and claiming otherwise is ahistorical. Even back in the '60s, a sports car enthusiast would…

And the Tesla plaid is the fastest nurburgring sedan ever made. Go ahead, say that's not a sports car.

Its not a sports car. Besides, BMW M4 CSL, Jaguar XE project 8, BMW M3, Mercedes AMG 63 GT have faster lap times.

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

#213

Post by 0xDEF »

hanniabu wrote: post #188
underlines wrote: post #91

Earlier quoted context omitted.

radicalbyte, you're absolutely right that the use of fans in Micromouse increases the traction, and therefore the speed at which the maze is solved. Suction allows for impressive performances. However, a small caveat that might be worth considering is that while the suction indeed increases speed, it might be more accurate to say that it primarily improves acceleration instead of car speed: The issue often lies with…

[flagged]

So many old polite people on the Internet are going to be accused of being AI chatbots.

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

#214

Post by spixy »

namdnay wrote: post #194
londons_explore wrote: post #76

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…

Modern motors get lighter in part because they can offer lower torque with a smaller rotor but compensate with higher rpm. That’s not possible for a hub motor

Can you compensate smaller rotor with larger stator (magnet), so rpm could stay the same?

And why you cannot have small hub motor with high voltage (kilovolts) and very high rpm?

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

#215

Post by pedalpete »

I was wondering how this compared to motorcycles, and didn't realize that today's production motorcycles are not significantly faster than modern hypercars, the fastest motocycle clocking in at 2.2 seconds [1]

Ignoring the million dollar sports cars, other cars such as Porsche 911 turbo s from 2020 is 2.1s.[2].

I know, Tesla and Lucid, etc are also crazy fast, but I believe their quoted 0-60 times are all with a roll-out.

[1]https://en.wikipedia.org/wiki/List_of_fastest_production_mot...

[2]https://en.wikipedia.org/wiki/List_of_fastest_production_car...

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

#216

Post by lucgommans »

chungy wrote: post #189
lucgommans wrote: post #177

Earlier quoted context omitted.

You never use a calculator?

I use calculators plenty, but I neither have that one installed nor use it. On my PC, I use either grpn or units. More often, I pull out my HP 48G+.

GRPN for anyone else who doesn't know it: http://lashwhip.com/grpn.html

What I meant to say is that, if one uses a featureful calculator like qalc, then you get unit conversion included without needing two separate utilities. Of course, if you've used a(n obscure) calculator for decades then it may be easier to learn to use a separate unit convertor instead

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

#217

Post by xcv123 »

epolanski wrote: post #193
js2 wrote: post #68

Impressive but for reference, about half the acceleration of a Top Fuel dragster, which are also still getting faster. Here's Brittany Force who holds the current records (fastest time, fastest speed): https://www.nhra.com/news/2022/brittany-force-sets-national-... 0 to 338.43 mph in 3.665 seconds over 1000 feet. (The cars got too fast for 1,320 feet and have been racing 1000 feet since 2008.)

Aren't electric cars bound to beat any dragster car eventually? You get max torque instantly.

Depends on how fast you can release that energy from the batteries. Not as instant. Chemical explosions are rapid.

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

#218

Post by uberman »

hedora wrote: post #82
uberman wrote: post #40

Earlier quoted context omitted.

about 0.11 football fields were required to reach 100km/h

That seems high. What was the mass-to-energy conversion efficiency?

13.5 yards to go from 0 to 60mph seems high? How far did you anticipate it would take to reach that speed?

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

#219

Post by tstrimple »

pedalpete wrote: post #215

I was wondering how this compared to motorcycles, and didn't realize that today's production motorcycles are not significantly faster than modern hypercars, the fastest motocycle clocking in at 2.2 seconds [1] Ignoring the million dollar sports cars, other cars such as Porsche 911 turbo s from 2020 is 2.1s.[2]. I know, Tesla and Lucid, etc are also crazy fast, but I believe their quoted 0-60 times are all with a roll…

Cars designed for high speed will have a significant advantage over a motorcycle through capturing down forces to dramatically increase the amount of friction between the tires and the surface before losing grip and spinning out. Motorcycles can own the power to weight ratio category, but they can't use all that power because at that point the wheels just spin.

I found it super interesting when I learned that one of the biggest advances in maze solving races is that someone ended up putting a fan in their little "mouse" to push down so the wheels could get more traction.

https://hackaday.com/2008/11/26/vacuum-micromouse/

More details on maze racing from Veritasium: https://www.youtube.com/watch?v=ZMQbHMgK2rw

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

#220

Post by chen_dev »

radicalbyte wrote: post #7
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.

In Micromouse ( https://en.wikipedia.org/wiki/Micromouse ) - a competition where autonomous devices solve a mouse maze - the fastest competitors are all using fans to increase traction (and thus speed).

Interesting topic. A pretty good video about this: https://www.youtube.com/watch?v=ZMQbHMgK2rw
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