This come up last week when I was making the sprint for Tribes: Vengeance at work. I was told that the sprints need to look more powerful and was trying out a few little think to do that and I happened to come up with this run.
http://www.geocities.com/brendandoord/JackRun.avi
I did get a much better sprint for the game, so all you fans don't get scared.
You may have to copy the link in to your Brower.
Well this is excellent Doord! I almost cacked my pants ;)
Not exactly powerful but still sends a message...