Trap Speed ET Math

[mokancraig]

Worked this up last year and forgot to post. It's not 100% fool proof (I'm no quantum physicist), but could be useful to see if you where on a quicker pass before you got on the brakes in the speed trap.

This formula will allow you to figure your ET at the MPH cone. Input your MPH where it says MPH and ET where it says ET.

(MPH x 5280) ÷ 3600 = Feet Per Second (FPS)

66 ÷ FPS = Elapsed Time in Trap (ETT)

ET - ETT = ET at MPH Cone

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For Example, let's say you ran a 6.6116 @ 106.38

106.38 x 5280 = 561,686.40 ÷ 3600 = 156.024

66 ÷ 156.024 = .4230

6.6116 - .4230 = 6.1886

Clear as mud, right?

[Carl Blanton]

I think what Craig should have said is this math will give you your ET at the first MPH cone. The speed trap starts 66 ft in front of the 1/8 – 1000 ft and 1/4 mile. So, for example, if you were running 1/8 mile and you did this math, you would have an ET from the 594 foot mark. 1/4 mile would be 1254 feet. And so on.

This is useful if you are braking in the speed trap and you want to compare runs.