[TEC] tell me oh modding wizzards about making a playable blimp

[Pvt. Public]

specifically i would like to know what exactly needs to be done to allow something to fly.
i know there is plenty of really good info on doing other aspects like adding equipment available in the forum so i will be making good use on that, but the two things im unclear on at the moment is, like i said before, making something fly. and a little minor question, what file type does SH4 use? i have heard 3ds max thrown about as being able to make models for SH4 but i would like to use a different program if possible.

any info would be greatly appreciated!