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Originally posted by Defragger
Are there any more details you can provide? Was the sound pulsating, whining, humming, etc? Was it similar to the "whopping" of helo blades? How long did it last? Any external effects like things rattling or shaking? What were the weather conditions? Any power problems like brownouts, lights flickering? More than one person experience it? Could you see anything? Any odd sensations physically? Did it "feel" like there was something above you, like the sensation of weight or mass above you? How high up did you percieve it to be? I'm sure there are more questions, maybe these will lead you into some more afterthoughts. My thoughts are that at first read this comes across as something man made, maybe a fastmover pulse detonation drive style of craft, something we here in the states have seen example of on the west coast from time to time.