ORIGINAL: hamburgler
yes but if they are consistantly slow in starting in (ie have a slow reaction time) but then on time stopping it then your calcs will be off. im not bashing your idea but just use a radar gun. man if they radar guns are 7 to 12 mph off then people in court who argue tickets would consistantly win. they are not very acurate. the cops have the best toys. also, you can hook up a bike speedo. it may not be the best idea but it will be very close. you can buy some that log the top speeds so you run it for 100ft and then it will hit top speed and then drive it back and look at the speedo to see how fast it got going.
No, you're not bashing the idea. You only commented on how bad it is and suggested several other options to achieve the same results. Whatever...
You know, it's not that hard to do. It's very easy to start and stop the time when the front wheels touch the line. If your friend is that bad at it, let them drive the truck and time it yourself. Or better yet, hang out with smarter friends!
What I was suggesting is a method that is a fast and easy to do. It will not cost you any money, you don't have to do any mods, mount gadgets, glue magnets to your rims, be a mathematician, calibrate anything, or try to befriend a cop. Pretty easy, huh?
I think I'll go play with my truck now!
Enjoy all.