Don't snowmobiles and jet-skis do 0-100 in a couple of seconds? Why don't they provoke this kind of reaction?
3g on your body, you need a very good grip on that jetski handle...
Yeah guess that would require elite athleticism!
0 To 100 kph in 1 second [video]
41–50 of 123 posts
Re: 0 To 100 kph in 1 second [video]
#42How do you get on the ETHZ team that does this? I would have loved to do this in my undergrad engineering degree, but nothing like this ever appeared in my curriculum.
Re: 0 To 100 kph in 1 second [video]
#43Earlier quoted context omitted.
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 transmissi…
> battery technology only needs to equal about 25-30% the raw energy density of fuel
"only" is doing a lot of work here, current lithium batteries are under 1 MJ/kg while good ol car gasoline is at 40+ MJ/kg
top fuel dragsters run nitromethane which is 4 times less energy dense than regular gas yet the go much faster so clearly there is much more going on than just energy density, like the fact that they have to entirely rebuild their engine every other day. I don't even think energy density is a big deal, it's more about how fast you can convert it into movement, and explosions are very good at that type of large scale conversion
Re: 0 To 100 kph in 1 second [video]
#44Earlier quoted context omitted.
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 transmissi…
> battery technology only needs to equal about 25-30% the raw energy density of fuel "only" is doing a lot of work here, current lithium batteries are under 1 MJ/kg while good ol car gasoline is at 40+ MJ/kg top fuel dragsters run nitromethane which is 4 times less energy dense than regular gas yet the go much faster so clearly there is much more going on than just energy density, like the fact that they have to enti…
> rebuild their engine every other day
Top fuel engines are torn down and rebuilt between runs.
Re: 0 To 100 kph in 1 second [video]
#45Re: 0 To 100 kph in 1 second [video]
#46I 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 con…
On the other hand, absolutely unlimited performance - perhaps without a human driver - racecars would be pretty cool to watch. Extreme speed! Grandstands etc would need to be extra secure though due to the higher speeds.
> Grandstands etc would need to be extra secure though due to the higher speeds.
So maybe then also get rid of spectators?
Re: 0 To 100 kph in 1 second [video]
#47Earlier quoted context omitted.
Ground effect was used in F1 between 1978 and 1982. Ayrton Senna died in 1994.
Senna died when his car lost downforce due to mechanical fault.
No, he died because of a steering column failure, not a loss of downforce.
Edit: I read up some more and it seems that noone really knows why he lost control. My previous impression was that the steering column broke mid-corner causing him to crash into the wall.
This is from an interview with Adrian Newey who designed the car: Newey admits that he has considered the causes of the crash repeatedly over the past 17 years. "If you look at the camera shots, especially from Michael Schumacher's following car, the car didn't understeer off the track. It oversteered which is not consistent with a steering column failure. The rear of the car stepped out and all the data suggests that happened. Ayrton then corrected that by going to 50% throttle which would be consistent with trying to reduce the rear stepping out and then, half-a-second later, he went hard on the brakes. The question then is why did the rear step out? The car bottomed much harder on that second lap which again appears to be unusual because the tyre pressure should have come up by then – which leaves you expecting that the right rear tyre probably picked up a puncture from debris on the track. If I was pushed into picking out a single most likely cause that would be it."
Re: 0 To 100 kph in 1 second [video]
#48I 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 con…
The official cause of Senna's crash was due to a failure of the steering column that was modified before the race. Not du to loss downforce.
Re: 0 To 100 kph in 1 second [video]
#49How do you get on the ETHZ team that does this? I would have loved to do this in my undergrad engineering degree, but nothing like this ever appeared in my curriculum.
There's some thesis displayed on their website ( https://amzracing.ch/en/about-us ). Probably you can apply when you're looking for a Bsc or Msc thesis subject.
Re: 0 To 100 kph in 1 second [video]
#50Earlier quoted context omitted.
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 transmissi…
> battery technology only needs to equal about 25-30% the raw energy density of fuel "only" is doing a lot of work here, current lithium batteries are under 1 MJ/kg while good ol car gasoline is at 40+ MJ/kg top fuel dragsters run nitromethane which is 4 times less energy dense than regular gas yet the go much faster so clearly there is much more going on than just energy density, like the fact that they have to enti…
superchargers (compressed air), huge sets of staged injectors, low compression ratios, stoichiometric ratio of nitromethane to air (1.7:1 instead of ~14.7:1 like normal petrol!) - as you say, it's about how fast you can convert the liquid to an explosion.