Here's a plugin for the Superhero Mod by K-OS that you should look into.
http://forums.alliedmods.net/showthr...light=Savage25
It contains all the physics you need and they work perfectly, K-OS is pretty good. If you want to see this in action you can head to my clan's server below and try out RC Man, which is this hero recoded but using the same physics code (which I'm not going to even attempt to understand for at least a year).
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