I used to work at the Bombing Range at Evans Head a few years back, and was privy to witnessing 2 F111's go supersonic over the top of us at about 50ft. Blew every window in the place, lifted the roof, did a heap of damage in a split second. By my calculations they were travelling at about 300m per second. It was awesome!!! The best thing is I managed to get it on film as stills and a mate got it all on video. What an awesome weapon of an aircraft!!