Hey, I just created a little javascript that calculates the speed of an R/C vehicle based on some input. Not sure if it's of any use to anyone else, but I've used it a bit when I was picking out various parts to buy.
Anyway, here it is:
http://www.scriptasylum.com/rc_speed/index.html
If anyone has any other presets to add (you'll see what I mean), let me know and I'll add them. Also, please let me know if there are any accuracy issues. It does
not account for wind resistance or weight.