Mr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9 Posted (12 years 1 month 2 weeks 1 day 23 hours ago) and read 3257 times:
In the info section of photo below, the photographer states that this USAF B-1B Bomber is making a high speed pass very near the sound barrier. Obviously, if this B-1B did break the sound barrier, the photographer (and everyone else in the neighberhood) would have known it.
My question is: How much faster would this B-1B have to be going to break the sound barrier and create a sonic boom? If it is already causing a shock wave that's forming a cloud of vapour, then wouldn't it be very close? (as in only a few mph short of the speed required).
Nikes From , joined Dec 1969, posts, RR:
Reply 2, posted (12 years 1 month 2 weeks 1 day ago) and read 3077 times:
- I believe that parts of the aircraft are already "locally" supersonic. This is due to acceleration of air over the lifting surfaces that pushes the local air to supersonic velocity. I would est. that aircraft speed in the .6 to .9 range.
Peterba69 From United States of America, joined Mar 2002, 70 posts, RR: 0
Reply 3, posted (12 years 1 month 2 weeks 1 day ago) and read 3070 times:
I saw this same effect on a Blue Angel F/A-18 in SFO about 5 yrs. ago, and the guy was about 100' above the water. The announcer said he was doing 750 mph. At sea level, on a Standard Day, the speed of sound is 766, so the explanation of locally supersonic is correct.