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i have a charectar that when you hold the Up key he floats in air(w/jetpack) and by floats i mean moves up a bit the down but never hit ground till i release the up key

A simple way of doing this is to add a path of the initial arc, and it will end up going to the height you want it to by the end of the path. Now you would add a path finish event, that sets a variable that would prevent gravity. This may not be necessary depending on your animations, as you could use animindex to determine when to have gravity in the draw actor. If you need a demo or just further explanation I will be happy to help.