Thanks for the replies.I will try some of the ideas.Tuning isn't a problem.I have a whammy petal, that's not the sound I'm after, a propeller plane is the only way I can explain the sound, with a growl.In Van Halens' version of Pretty Woman, the first dive he does is the sound.Maybe it was timed with the down oscilation of a flanger?Darknail, I'm a Vai and Satch fan too.Vai does a cool trick were he hits his guitar body right next to the bridge and then does a three finger pulloff up high on the g string then repeats a few times.A cool Satch trick is sliding up a string and depressing the bar at the same time, trying to keep the pitch of the note the same.You get a cool warbling effect.