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I wrote up a simple Javascript web application to simulate the speed of your robot compared to other well known objects ( a bike, a car, etc.). There is also a football field in the background so you can see your robot's speed in relation to a football field.
Right now the simulation only supports whole numbers and only only operates in the feet per second resolution. I will add on support for meters per second later.
Also I am 75% done with the simulation portion for slow speeds in the inches per second scale. That part has a yardstick in the background. That should be ready in a few days.
Heres the link to the simulation , just enter the speed in feet per second in the text box above
http://www.narobo.com/projects/software/speed/speed.html
,Eric