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Old 11-16-2012, 08:51 AM   #29
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Quote:
Originally Posted by TG Twinkie View Post
To me it's like people who drive too fast in slippery conditions. Everything is fine, until they have to stop or maneuver suddenly.
I'm sure the is some physicist out there the can do the " object in motion" thing and tell us how much more energy is stored in a 5,000 to 10,000 trailer moving at 80mph as opposed to 60mph. Not to mention the weight of the TV.
I'll drive at 60mph max and let the meatheads go on by.
TG

I completely agree with you.

Regarding the energy, kinetic energy is proportional to the square of the speed, so there is almost twice as much energy at 80 mph (78%) than at 60 mph.

Dan
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Old 11-16-2012, 09:47 AM   #30
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Energy= mass times velocity times velocity... in physics class, for selecting ammunition, and for towing / driving a "projectile". To follow up on what TD & TG said above, even a slight increase in speed, gains a huge increase in energy ... that which is required to stop. Of course if you double the moving mass by adding a trailer or payload, you double the energy required to either accelerate or *and, perhaps more importantly* stop.

If a 4000 lb trailer stays a constant in the equation;
as an example; 60 mph=88 feet per second; 88 times 88 = 7744
80 mph=~117 feet per second; so, 117 times 117 = 13689
50 mph =~73 feet per second; so, 73 times 73 = 5325
The energy equation speed multiplier more than doubles from 50 to 80 mph !!

That does not even take into account my lengthening reaction time - but I know that I have increased my reaction time and "slowed" a bit every year from my active flight school days. At 80 mph, I will have passed the length of a football field in just three seconds ... reason enough for me to stay well below 80 mph (50-55 is my preference) at age 64. Clearly, even a slight distraction and less than 100% attentiveness puts me and others at risk ... adjusting the audio, coffee/beverage, cigarettes, texting or even answering a non-hands free cell phone all contribute "accidentally" to crashes... OK, off the soapbox - from a former LEO and math/CS dept chair.
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Old 11-23-2012, 11:23 AM   #31
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Perhaps a drive in California is informative. Even motorcycles with a trailer have a 55mph posted speed limit, let alone RV trailers and semi trucks. My drive home from the AS dealership I did 55. I stayed in the right lane and was passed by every vehicle class. When I crossed into Arizona, I continued at the same speed, only I was passed by folks running much quicker than the posted 75mph. I was more interested in learning how the rig performed with the wind surges of the passing buses and trucks than setting a speed record. There are two lanes and one is called the passing lane. Unfortunately, the majority of drivers in the US lack lane discipline and even hog the fast lane at a slower speed.

I really do not care what TV one has, speed just magnifies any issues like a tire issue or avoidance of road debris. The faster one goes, the stopping distances are longer and quicker reflexes are necessary. I bought the AS as a device to enable relaxed seeing of the country side. I have done the faster driving in sports cars and on motorcycles and that faster speed required complete attention to the road, not the scenery. Ever come around a mountain curve and find a boulder in your lane? I have. Faster speed decreases one's options in a hurry.

The math from the gas embargo era was a 10% decrease in fuel economy per every 5 mph increment over 55. So running 65, one could use perhaps 20% more fuel than running 55.
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