Originally Posted by Ingenieur

that is once the brakes are applied
reaction time and system lag time (pedal travel, build up some prssure, pads to engage)

the numbers I've seen for Porsches with PCCB were 310 range
couldn't find a specific number for the CGT and this is under testing conditions: on a wet or road with any debris, paint stripes, worn tires, etc, you will be much further...a couple 32's of tire wear can increase the distance significantly, as much as 20% according to Bosch Automotive Engineering Handbook...

reaction time, even if you can assess the situation/need to brake and make the move in 1 sec, unlikely, you still have travelled 150 ft
even if it's only 2 seconds to see a deer, kid, stopped vehicle you'll have travelled 300'
trained gun fighters require that much to assess and fire, and they are locked and loaded and anticipating the shot...
'surpise' adds a lot to reaction time, you don't drive on the edge of anticpation of emergency/unexpected braking (like you do when you know a corner is approaching)

according to Bosch and Volvo the system lag may be 0.1 to 0.3 sec, 15 to 45 ft

500' for the total distance = reaction + system lag + braking distance is not unrealistic, and probably conservative

from a highway design manual
To make highways reasonably safe, the engineer must provide a continuous sight distance (see the stopping sight distance module) equal to or greater than the stopping sight distance. As an integral part of the stopping sight distance, a value for the brake reaction time must be assumed. Extensive research has shown that 90% of the driving population can react in 2.5 seconds or less. The brake reaction time normally used in design, therefore, is 2.5 seconds. The distance traveled during the brake reaction time can be calculated by multiplying the vehicle's initial speed by the brake reaction time.

on a bell curve 80% will be 2 sec +/- 0.1 sec



Here's a simple example. Suppose a person is driving a car at 55 mph (80.67 feet/sec) during the day on a dry, level road. He sees a pedestrian and applies the brakes. What is the shortest stopping distance that can reasonably be expected? Total stopping distance consists of three components:

1. Reaction Distance. First. Suppose the reaction time is 1.5 seconds. This means that the car will travel 1.5 x80.67 or 120.9 feet before the brakes are even applied.
2. Brake Engagement Distance. Most reaction time studies consider the response completed at the moment the foot touches the brake pedal. However, brakes do not engage instantaneously. There is an additional time required for the pedal to depress and for the brakes to engage. This is variable and difficult to summarize in a single number because it depends on urgency and braking style. In an emergency, a reasonable estimate is .3 second, adding another 24.2 feet.
3. Physical Force Distance. Once the brakes engage, the stopping distance is determined by physical forces (D=S²/(30*f) where S is mph) as 134.4 feet.

Total Stopping Distance = 120.9 ft + 24.2 ft + 134.4 ft = 279.5 ft

Originally Posted by vdubpower

never had i heard of or seen heat cracking bones....him bracing for the impact would cause the radius and ulna to fracture....

Originally Posted by Merc63

You sound like a guy with zero friends.

Originally Posted by Euler

Are you the author of the referenced article? It has a similar pedantic and condescending tone.

Originally Posted by Euler

All that and nothing about a fire. Cumon engineer tell us how stuff burns.

Originally Posted by jrcart

Ah, I see what you are saying I did not realize you were factoring in reaction time. I just looked and found several sites with CGT 100-0 and they range from 274-288 depending on publication. Wikipedia has it listed at 277.

Originally Posted by Ingenieur

you need to be like that when trying to convey even the most basic information to morons like yourself, especially when they get verbose trying to sound intelligent mr. look at me I'm a 'math man'

you probably think anybody trying to explain anything to your superior brain is 'condescending'

Originally Posted by Ingenieur

says the dweeb with >3000 posts
projection: you sound like you have experience with having no friends
people are better off without friends like you

you should be a bit more concerned about your trainwreck of a life than mine

Originally Posted by 573WHPCLS

To think it is only early January and we already have a Douchebag Of The Year contender

Originally Posted by Ingenieur

some decisons need made before any action can be initiated:
what is that ahead?
what should I do? (nothing, brake, swerve, etc.)
then the physical reaction time to implement the decison, make the move
then the system lag/delay and actual stopping distance
it's a loooong way but a short time

I'm as guilty as anyone of thinking my skills are better than they are...
people have a hard time embracing their limitations
so I try to compensate with a better understanding of the physics/mechanics of the system

travelling in a car at >100 mph is a potentially dangerous situation and many lose sight of this due to complacency or having gotten away with it before, or vodeo games, or movies,whatever...some people are easily influenced

these guys had everything to live for, yet died in the blink of the eye for nothing...tragic
completely & easily avoidable

hopefully some good can come from this, perhaps young guys who see this accident rethink their driving style on public streets, I don't know the guy (obviously), but I think Walker would like this, it could save lives, then it could have some meaning

Originally Posted by Euler

Suspicions confirmed

Originally Posted by 573WHPCLS

To think it is only early January and we already have a Douchebag Of The Year contender

Originally Posted by balthaser

heck, he's ruined one of the sticky already last year. https://mbworld.org/forums/c63-amg-w...oblems-21.html

Originally Posted by Thericker

Excercise the edit option, your formula should read "Z = Infinite blowhard"

Originally Posted by Ingenieur

you sound like a previous winner

I have some stiff competition

Originally Posted by jrcart

He is far from being a D bag. Actually he is a real engineer and pro nhra drag racer, pretty sure he was involved on designing the 1990's Corvette ZR1 motor for Mercury Marine, I am also pretty sure his family founded Mercury Marine and he still heads up their engineering department, just sayin.

Originally Posted by Thericker

Excercise the edit option, your formula should read "Z = Infinite blowhard"

Originally Posted by Ingenieur

that doesn't disqualify him from being a douche'
just a smart douche'

Originally Posted by jrcart

I was wondering the same thing. Does this guy remind you of Jangy or what?

You new guys don't know Jangy but this guy might be Jangy.

Originally Posted by Thericker

You certainly showed us.. In your pedantic never ending delivery no less.. I feel pitty for anyone in your immediate social circle who's forced to endure regular ear phuking sessions from you. (obviously only family members as you clearly are a terribly lonely bitter friendless human being)

Happy New Year