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At 45 KPH, Driver has 0% chance of Survivability!!!!
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Pepsi90919
Lifer
the only thing owning is the English language of you.
Check your math again. Maybe you calculated for m/s instead of km/hour?
45km/h is the speed reached from a fall of 4.9m (about 16.5 feet). Those would be 4 really short stories. You might break a bone but it's pretty unlikely to kill. If a 28mph collision killed that easily, the # of deaths from pedestrian-bicycle collisions in NYC would not be zero.
I think this is especially funny because the Wall Street Journal had an editorial yesrtday where they claimed that pushing for better fuel economy in automobiles would lead to thousands of more deaths in accidents because manufacturers would automatically start making the cars more lightweight.
Not only did they totally not mention that you could improve also MPG with better engine and transmission technology (such as switching to a CVT tranmission like some of the new Jeeps are going to use to improve fuel economy), but they erronously assumed that all cars of a given weight would be equally survivable, which is just simply not true. Competent engineers can design a fairly lightweight car bodies that are able to direct the impact forces away from the passenger compartment. There are tons of fairly lightweight import cars that do great in car tests, while at the same time there are also fairly heavy vehicles like this Passport clone that do horrible in crash tests even though they are pretty heavy vehicles.
It amazes me that a even respected newspaper like the WSJ resorts to irration fear mongering like this to push throgh their political agendas. It was pretty sad. The only concrete example of an unsafe compact car they could come up with was the classic Beetle, which hasn't been sold new in the US for decades. My new 2005 Corolla gets 38 MPG on the highway and has a 4-5 star rating in every crash test I've seen, not to mention airbags aplenty.
Not only did they totally not mention that you could improve also MPG with better engine and transmission technology (such as switching to a CVT tranmission like some of the new Jeeps are going to use to improve fuel economy), but they erronously assumed that all cars of a given weight would be equally survivable, which is just simply not true. Competent engineers can design a fairly lightweight car bodies that are able to direct the impact forces away from the passenger compartment. There are tons of fairly lightweight import cars that do great in car tests, while at the same time there are also fairly heavy vehicles like this Passport clone that do horrible in crash tests even though they are pretty heavy vehicles.
It amazes me that a even respected newspaper like the WSJ resorts to irration fear mongering like this to push throgh their political agendas. It was pretty sad. The only concrete example of an unsafe compact car they could come up with was the classic Beetle, which hasn't been sold new in the US for decades. My new 2005 Corolla gets 38 MPG on the highway and has a 4-5 star rating in every crash test I've seen, not to mention airbags aplenty.
Vic
Elite Member
No. Even though I was converting to English measurements, it comes out the same when I stay in metric.
45kph = 12.5m/s -- (45,000 / 60^2)
1g = 9m/s^2
To reach a 12.5m/s at an acceleration rate of 9m/s^2 would take approx. 1.2 seconds and a fall of at least 10.5m or roughly 35 feet.
I'm using approximations here and not bothering to exactly factor the acceleration curve, but I'm quite sure my figures are close to accurate. Keep in mind that 45kph is 12.5 meters per second. (12.5*3.3) That's 41 feet per second (1g also = 32 feet/second^2). That most certainly is fast enough to kill.
And (just like with cars) a bicyclist rarely hits anything at full speed (which 28 mph would be at or very close to). He slams the brakes before impact, scrubbing speed fast enough that actual impact speed is considerably less.
quakefiend420
Lifer
they would never get sold in the US like that
by the time they made it semi-safe it would probably cost about what comparable models sell for anyway
by the time they made it semi-safe it would probably cost about what comparable models sell for anyway
HumblePie
Lifer
Errr..Well it's been about 10 years since I've taken physics so I hope I'm right in my calculations.
Distance on a single plane with zero initial velocity is 1/2(acceleration)(time)^2. Gravity is closer to 9.82m/s^2 or most use 10m/s^2 not 9 when rounding. Velocity is (accerlation)(time). So substitution is t = V/a and t = (sqrt)(2x/a)or V/a = (sqrt)(2x/a).... we are looking for distance which is X. We don't know time so we factored that out. We know veloctiy is 12.5m/s. We know a is 10m/s^2. So x = V^2/2a. X = (12.5m/s)^2/2 (10m/s^2). The seconds cancel out which leaves meters left which is distance and what we want. This is about 7.8 meters or 26 feet. Which is about 2 and a half stories. This is done in 1.25 seconds. 2 and a half stories is enough to kill anyone. Any fall above double your own height is enough to break the spine of a human or kill one. Since I'm 6 feet tall, 12 feet and above is the distance at which a fall becomes exponentially fatal. At 26 feet it can be down right serious.
Also, so to the above math wanabe posters....you were both wrong. 26 feet is not 4 stories last time I checked either. About a fall off a two story building. Yah, if done right, and landed right, and prepared for it, a fall from that height can be negotiated to not be fatal or even cause injury. But any slip up can cause a impact at that speed to be fatal.
Distance on a single plane with zero initial velocity is 1/2(acceleration)(time)^2. Gravity is closer to 9.82m/s^2 or most use 10m/s^2 not 9 when rounding. Velocity is (accerlation)(time). So substitution is t = V/a and t = (sqrt)(2x/a)or V/a = (sqrt)(2x/a).... we are looking for distance which is X. We don't know time so we factored that out. We know veloctiy is 12.5m/s. We know a is 10m/s^2. So x = V^2/2a. X = (12.5m/s)^2/2 (10m/s^2). The seconds cancel out which leaves meters left which is distance and what we want. This is about 7.8 meters or 26 feet. Which is about 2 and a half stories. This is done in 1.25 seconds. 2 and a half stories is enough to kill anyone. Any fall above double your own height is enough to break the spine of a human or kill one. Since I'm 6 feet tall, 12 feet and above is the distance at which a fall becomes exponentially fatal. At 26 feet it can be down right serious.
Also, so to the above math wanabe posters....you were both wrong. 26 feet is not 4 stories last time I checked either. About a fall off a two story building. Yah, if done right, and landed right, and prepared for it, a fall from that height can be negotiated to not be fatal or even cause injury. But any slip up can cause a impact at that speed to be fatal.
gsellis
Diamond Member
OK, you have uncovered China's plot for world domination.
1) Sell millions of these SUVs to American capitalist pig-dogs
2) Push the secret button that sends out the coded "crash" signal to all the vehicles
3) Half of America dies in horrific car crashes
4) Invade America
5) Win!
😀
1) Sell millions of these SUVs to American capitalist pig-dogs
2) Push the secret button that sends out the coded "crash" signal to all the vehicles
3) Half of America dies in horrific car crashes
4) Invade America
5) Win!
😀
The quality of the welding job can make a huge difference in how well the structure of the vehicle stays together in a crash. If they don't have as good QA on the welding jobs as Honda/Isuzu, then the welds might break under far less force and cause the frame to buckle.
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