The Quack Shack

[WannaBeHillBilly]

The autobarn has a minimum doesn't it? It'd almost have to

Not a minimum speed, but your vehicle must be capable of reaching a speed of 60Km/h (37mph) at least. That does not mean you have to drive at least 60 Km/h at all time, it was introduced to prevent people from using the Autobahn with their Mopeds or Tractors. (Nowadays there are Tractors that can drive faster though.)
More important for traffic safety is a general speed-limit of 80Km/h (50 mph) for every vehicle with gross weight of more than 7.5 tons (16534 lbs). I always feel somewhat uneasy when driving at 75mph on the interstate (speed-limit is 70!) and being overtaken by a huge, fully loaded semi-truck, driving over 80 mph. If that thing needs to be stopped…

 

[WannaBeHillBilly]

Pastrol. Agricultural. I'd love to work for a pastry company too

You. Would. NOT!!!
While being a student, i worked as a fork-lift operator for Lekkerland in one of their warehouses. At this time Lekkerland was the largest sweets and candy whole-sale operator in Germany, the company name literally means "tasty land". We were allowed to "dispose" the content of all broken boxes… I gained way too much weight in the three months i worked there.

 

[WannaBeHillBilly]

Good morning folks Good evening Wunda & Kiwi

Good day John! - Overslept today due to having a customer in Mountain time and the ducks were so mad at me…

 

[WannaBeHillBilly]

We have a piece of farmland in KY, that we rent to a farmer who shares profits from his crops with us. He cares for and plants the land. This sounds a little more in depth. Prolly because there are livestock involved. That is a lot of work for two people. I hope you have help.

Farmland in Kentucky?!
I thought Kentucky is just a huge horse pasture with some stables for the humons sprinkled in…

 

[duluthralphie]

Not a minimum speed, but your vehicle must be capable of reaching a speed of 60Km/h (37mph) at least. That does not mean you have to drive at least 60 Km/h at all time, it was introduced to prevent people from using the Autobahn with their Mopeds or Tractors. (Nowadays there are Tractors that can drive faster though.)
More important for traffic safety is a general speed-limit of 80Km/h (50 mph) for every vehicle with gross weight of more than 7.5 tons (16534 lbs). I always feel somewhat uneasy when driving at 75mph on the interstate (speed-limit is 70!) and being overtaken by a huge, fully loaded semi-truck, driving over 80 mph. If that thing needs to be stopped…

The truck in theory should stop in the same distance as a car.

Braking is simply removing kinetic energy.

Braking is a product of weight, speed and coefficient of friction. The weight is immaterial as long as all the brakes are functioning properly.

If the vehicle becomes airborne that changes things.
The shifting of a load changes things also.


Lastly, there use to be a false idea not having brakes on the steering axils made control easier. But I think that idea died out in the late 70’s.

I wish I could remember the exact formulas. However, being old and retired I have forgotten some of the things I learned in accident reconstruction schools.

So in closing theory doesn’t always apply because of humans actions...

 

[rjohns39]

Good day John! - Overslept today due to having a customer in Mountain time and the ducks were so mad at me…

Good morning Hillbilly, have a great day

The truck in theory should stop in the same distance as a car.

Braking is simply removing kinetic energy.

Braking is a product of weight, speed and coefficient of friction. The weight is immaterial as long as all the brakes are functioning properly.

If the vehicle becomes airborne that changes things.
The shifting of a load changes things also.


Lastly, there use to be a false idea not having brakes on the steering axils made control easier. But I think that idea died out in the late 70’s.

I wish I could remember the exact formulas. However, being old and retired I have forgotten some of the things I learned in accident reconstruction schools.

So in closing theory doesn’t always apply because of humans actions...

Good morning Ralphie, have a great day... I wouldn't even want to try and remember my accident investigation courses. I had enough trouble doing that math when it was fresh.

 

[duluthralphie]

Good morning Hillbilly, have a great day

Good morning Ralphie, have a great day... I wouldn't even want to try and remember my accident investigation courses. I had enough trouble doing that math when it was fresh.

Ahh..

Math was my forte’. I actually developed and proved two of the formulas used today. Well, one that is used for minimum speed in rear end collisions and another for exact speed using conservation of linear momentum. However, that one is seldom used, even though it proves out, because of the difficulty in getting exact angles at accident scenes.

 

[WannaBeHillBilly]

The truck in theory should stop in the same distance as a car.

Braking is simply removing kinetic energy.

Braking is a product of weight, speed and coefficient of friction. The weight is immaterial as long as all the brakes are functioning properly.

If the vehicle becomes airborne that changes things.
The shifting of a load changes things also.


Lastly, there use to be a false idea not having brakes on the steering axils made control easier. But I think that idea died out in the late 70’s.

I wish I could remember the exact formulas. However, being old and retired I have forgotten some of the things I learned in accident reconstruction schools.

So in closing theory doesn’t always apply because of humans actions...

Hi Ralphie, you are absolutely correct when saying: »Braking is a product of weight, speed and coefficient of friction.« - But your next sentence »The weight is immaterial as long as all the brakes are functioning properly.« is just plain wrong!
Sit down in your car alone, accelerate to 40 mph and hit the brake pedal as hard as you can and record the distance your car needs to stop. Then repeat with four passengers and a trunk full of luggage and you will see that the same car at the same speed needs a longer distance to stop, because weight is a factor in the equation.

The main factor, influencing the stopping distance, is the size of the area where the tires have contact with the road. The larger the area, the higher the friction will be and the shorter the stopping distance.
A fully loaded passenger car, may weighs about 4 tons (8800lbs) while a fully loaded semi-truck clocks in at 40 tons (88,000 lbs), ten times the weight, but the contact area of the truck is not 10 times the size of that of the car. The car has 4 tires, a semi truck would have to have more than the usual 18, even though one truck tire has a larger contact area than a car tire…

My driving instructor used to say »40 tons always have the right of way…«

 

[Magnolia Ducks]

Farmland in Kentucky?!
I thought Kentucky is just a huge horse pasture with some stables for the humons sprinkled in…

That's just the part between Louisville and Frankfurt. I'm from west KY. Swamps and soybean fields down by the Mississippi river

 

[duluthralphie]

Hi Ralphie, you are absolutely correct when saying: »Braking is a product of weight, speed and coefficient of friction.« - But your next sentence »The weight is immaterial as long as all the brakes are functioning properly.« is just plain wrong!
Sit down in your car alone, accelerate to 40 mph and hit the brake pedal as hard as you can and record the distance your car needs to stop. Then repeat with four passengers and a trunk full of luggage and you will see that the same car at the same speed needs a longer distance to stop, because weight is a factor

Unfortunately, you are wrong about my being wrong. However, your driving instructor was right for a myriad of other reasons.

I circled the part that struck me as weird. That is the definition of coefficient of friction as used in accident construction. Now the coefficient of friction is made up of a ton of factors, including the road surface material, dampness versus dryness if the road and the slope of the road, to a lesser degree and depending on accident type the crown of the road.

As far as your idea to have me drive 40 and hit my brakes. I have done that a multitude of times. Most times faster then measure my skid marks. We use to do that when reconstructing an accident. We knew the weight of our squads. (We had those pesky state owned truck scales to weigh on for free). We would know the exact speed we were going (because of certified speedometers and onboard radar, the state spared no money equipping our cars) then by measuring our skids we would get the coefficient of friction.

However, that method became outdated with the anti-lock brakes. We then went to dragging a Tire (cut into a kind of boat) which weighed 50 pounds (lighter than a 100lbs one and still made the math easy. We took at least 3 test runs weight or car to get a good average coefficient of friction to work back the speeds of each vehicle.

It is a common misconception that more surface area means better braking. It is identical no matter the surface area because of the pounds per inch pressing down on that surface.

( however, what you stated is correct for distributing weight over a larger surface flotation on thin ice or snow)

However, you are not alone in trying to tell me or others I am wrong about this. Many attorneys have tried in court and upon appeal, most have failed.

I spent 30 years investigating accidents, while wearing a pretty maroon uniform. I am pretty sure (99.9992%) I am correct on this.

But I will admit I was wrong to say all dux are evil, I forgot to figure in the super duper crime fighting RalphieDux employed by the CIA and the military.