Thanks for the links InvaderTim & Sojourn. I checked out the stock footage but unfortunately they have filmed the explosions at normal framerate and not used high speed cameras. They have used a slow motion technique in their footage that you have to pay to download which doesn't look as natural as using a high speed camera and suffers from frame mix blur. If they had used a high speed camera then they would have been perfect.

Originally posted by: InvaderTim
As for Star Trek stuff, are you just looking for Starship explosions in general or something specific? I have all of the Star Trek DVDs and could probably help you narrow the search a little bit.

i have found a couple of explosions from Enterprise which are perfect but i still need a lot more. I'm mainly looking for any sort of explosions in space, the bigger the better.