Need JetPack type script

Ok i Dont need a jetpack as such, thing is im making a av and he has what looks like a jetpack but i dont want it to be a vehicle just want it to make maybe a noise and some kind of particle fire effect coming out of it whenever I fly. Any help would be appreciated much also anyone who manages to find me the perfect script I will give them a copy of the av. (Im not going to be selling it just for myself so it will be uniqe besides mine) O yeh another thing the script must be able to work when linked to other objects and it must be able to work on child prims (reason being is the jetpack has 8 vents and i want the effect coming from each one)