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Old 02-28-2011, 03:06 PM   #11
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Default Re: 40-yd dash times..about a foot?

Quote:
Originally Posted by ultimate View Post
First off I agree the 40 can be overrated and is best used in the overall evaluation process, but I think your calculations may be off.

Average speed for a 4.4 40 is about 9.091 yards/sec
Average speed for a 4.6 40 is about 8.695 yards/sec

Given 4.4 seconds a 4.6 runner will travel approximately 38.258 yards, a difference 1.742 yards.

That is a separation of over 5 feet. If that a cornerback he'd be extra crispy as in burnt.

And yes I know I'm a total nerd.
As long as we're being nerdy ....

If my math is correct, a 240# LB running a 1.50 10-yd split would bring as much momentum to a collision with the ball-carrier as a 265# LB running a 1.65 10-yd split. The difference being that the 265# guy would still be nearly a yard away from impact at the end of 1.5 seconds, or one more step in which the ball-carrier can build his own momentum.
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Old 02-28-2011, 10:16 PM   #12
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Default Re: 40-yd dash times..about a foot?

Quote:
Originally Posted by ultimate View Post
First off I agree the 40 can be overrated and is best used in the overall evaluation process, but I think your calculations may be off.

Average speed for a 4.4 40 is about 9.091 yards/sec
Average speed for a 4.6 40 is about 8.695 yards/sec

Given 4.4 seconds a 4.6 runner will travel approximately 38.258 yards, a difference 1.742 yards.

That is a separation of over 5 feet. If that a cornerback he'd be extra crispy as in burnt.

And yes I know I'm a total nerd.
Great first post nerd. Excellent work too.
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Old 02-28-2011, 10:44 PM   #13
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Default Re: 40-yd dash times..about a foot?

I don't feel like pulling out my abacus and slide rule right now , but I can point out that John Brenkus of ESPN's Sport Science raises a good point about this in his book The Perfection Point:

I can't say this with absolute certainty, but it would appear that, for most players running the 40, they are either maxed out by the end of the 40 or still (slightly) accelerating.

In other words, they cover the last 20 yards significantly faster than the first 20. . . . which means that the distance might be even greater than a yard or two.
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