Less than 3g? Wierd.
No. 1G is 9.8 ish (m/s)/s and 3x that is more than 100 kph/s
0 To 100 kph in 1 second [video]
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Re: 0 To 100 kph in 1 second [video]
#12Less than 3g? Wierd.
If you assume constant acceleration (unlikely, but whatever) and do the math, it works out to
(100 km/h)/s = 27.7777778 m/s^2 = 2.83g
Re: 0 To 100 kph in 1 second [video]
#13impressive, but as I've witnessed a top fuel dragster do 0-320mph in just over 3 seconds (meters away from me!), think I am a bit desensitised.
At that distance and in real time, can you see those tires doing that absolutely wild twist as they “wind up” all the tension gripping the asphalt?
Re: 0 To 100 kph in 1 second [video]
#14Less than 3g? Wierd.
Video says 3.8G with a lighter pilot than the TV host.
Re: 0 To 100 kph in 1 second [video]
#15impressive, but as I've witnessed a top fuel dragster do 0-320mph in just over 3 seconds (meters away from me!), think I am a bit desensitised.
Growing up watching top fuel I'm exactly the same. And until battery technology achieves the same energy density as fuel (and its a long way off) we won't see the same kind of speeds with electric vehicles.
Re: 0 To 100 kph in 1 second [video]
#164:30 if you want to skip his usual waffle
Admittedly the "usual waffle" is the actually interesting part of the video. For me the most interesting tidbit is using fans for generating ground force, like the micromouses do.
Re: 0 To 100 kph in 1 second [video]
#17Re: 0 To 100 kph in 1 second [video]
#18I would suggest that if you are allowed a fan that sucks air from under the car then you can easily achieve pretty much any acceleration.
The reason F1 cars do not do this is because suction is limited in F1 for very specific reasons and it goes back to the fatal crash of Ayrton Senna. Basically, a car that relies too much on suction is unsafe to drive because any failure can throw the car out of track with fatal consequences.
Suction is sensitive to distance between the car and the track. It is also sensitive to chasis being in good shape. If a car goes over some object on the track that unsticks the car from the ground and/or damages chasis, the car will instantly lose the suction and also any chance of stopping.
Another problem with suction is that it poses enormous force on shock absorbers keeping them hard and compressed.
Once you allow unlimited suction the next real limitation for acceleration is ability for the human driver to withstand acceleration.
Re: 0 To 100 kph in 1 second [video]
#19impressive, but as I've witnessed a top fuel dragster do 0-320mph in just over 3 seconds (meters away from me!), think I am a bit desensitised.
Growing up watching top fuel I'm exactly the same. And until battery technology achieves the same energy density as fuel (and its a long way off) we won't see the same kind of speeds with electric vehicles.
Nit pick: battery technology only needs to equal about 25-30% the raw energy density of fuel to equal the density of fuel in terms of useful work output.
That’s because electric motors can be as high as 98-99% efficient at converting electric power into work while small internal combustion engines peak out at about 35% and that’s generous. 20% is more typical. Then for ICE you have additional losses in the transmission that don’t happen for electric.
The vast majority of the energy in liquid fuel heats the air around the car.
This is also why a normal sized EV powered entirely by coal fired electricity can emit less carbon per mile than an efficient ICE car or even a hybrid. A big supercritical steam turbine in a coal power plant is going to be well over twice as efficient at converting heat into useful work than a small ICE. (Few people get all their power from coal, which is the worst case for CO2 emission, so in practice EVs are pretty much always lower carbon.)
Small heat engines suck.
Re: 0 To 100 kph in 1 second [video]
#20Because this is an electric car and just a few years ago, this was thought to be impossible. The engineering behind achieve this is impressive.
You are wrong on both counts. Has nothing to do with electricity. And it is pretty easy from engineering standpoint. The real reason F1 specifically bans this much suction is safety.