He was saying in Europe where he went to school (in the last 10 years) that jet fighters often broke the sound barrier above his college. But, he said the sonic boom doesn't continue like I had assumed it only occurs once. So, if this is true this means you ONLY get a boom the first time you crash through around 761 mph or there about. Depending upon how dry or wet the air is the sound barrier likely is at different speeds for wetness or dryness of the air around the world wherever you are doing this.
I began to think about the 3 Chinook helicopters over Mt. Shasta city which would have likely had to have traveled at between 5000 and 6000 feet when they were traveling with a UFO that travels through time in 1992 when I saw this happen in formation with a time traveling saucer as I witnessed it then in person. there were 3 Chinook 45 passenger helicopter troop carriers and one UFO all traveling together until it traveled forward in time to 2080 to see if the human race went extinct this century which it did by 2095 on that time line.
Then because they had to travel at 5000 to 6000 feet in altitude because the town is at 3500 to 3700 feet in altitude this caused the rotors to break the sound barrier every time they hit the oncoming air of the forward movement of the helicopter. So, as each blade hit the forward movement of the air traveling forward through the air it broke the sound barrier each time it hit the forward movement of the air. So, the sound was Bang bang bang bang ongoing because in relation to the air it first hit and then on the back swing of the rotor it then was moving slowly than the speed of sound against the air until it came forward to the front of the helicopter once again.
So, in the case of a helicopter at altitude trying not to crash and continuing to move forward it can sound like bang bang bang bang as each rotor hits the air moving forward and breaks the sound barrier once again at altitude.
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