For those who have gone to the darkside

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07 Feb 2017 20:44 #1 by Peter Davis
Peter Davis created the topic: For those who have gone to the darkside
Taken from internet.


How much torque and horsepower would you need for a 5 ton vehicle to have it reach 60 mph in 6 seconds?


5 tons = 4535 KG

In 6 seconds, from a standing start, reaching 60mph, 60mph = 26.8m/s

Power is work divided by time



and work done is the difference between starting and ending kinetic energies

W = KEf – KEi

The car started at rest, so KEi = 0 J. That leaves only the final kinetic energy to calculate:



Plugging in the numbers gives you:

KEf = 1/2(4535kg)(26.8m/s)^2

= 1,608,629J

So because



and the work done was

1,608,629 joules in 6 seconds

Then there were 271,434 W

1hp = 745.7W, so divide by that to get hp.

364hp.

Now, for the torque.

Let’s imagine the truck wheel is 24 inches in diameter = 58cm.

From stationary to 60mpg in 6 seconds is an average speed of 30mph, or 13.4m/s so the wheel needs to rotate at 23 revolutions per second, or 1380rpm.



= 1384 lbf torque.

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09 Feb 2017 15:17 #2 by DarrenWebster303
DarrenWebster303 replied the topic: For those who have gone to the darkside
We must get the stopwatch out Pete!

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12 Feb 2017 05:23 #3 by Peter Davis
Peter Davis replied the topic: For those who have gone to the darkside
I should do that one day since changing the turbo. From memory I think it was 60 seconds for 0-100 a few years ago.
The hard bit is finding a dead straight, dead flat, no wind and quiet road.

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