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B-1B Bomber Shock Wave Vapour?  
User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Posted (12 years 5 months 1 week 1 day 12 hours ago) and read 3365 times:

Hi guys.

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).


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Photo © Gregg Stansbery



Chris  Smile


"Just a minute while I re-invent myself"
10 replies: All unread, jump to last
 
User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 1, posted (12 years 5 months 1 week 15 hours ago) and read 3214 times:

Hi guys.

Well, I guess this question is GOING, Going, going, almost gone!

Chris  Smile



"Just a minute while I re-invent myself"
User currently offlineNikes From , joined Dec 1969, posts, RR:
Reply 2, posted (12 years 5 months 1 week 14 hours ago) and read 3185 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.

Nikes


User currently offlinePeterba69 From United States of America, joined Mar 2002, 70 posts, RR: 0
Reply 3, posted (12 years 5 months 1 week 13 hours ago) and read 3178 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.

User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 4, posted (12 years 5 months 1 week 13 hours ago) and read 3175 times:

Thanks for your replies gentlemen.

I figured that if the B-1B in the photo wasn't breaking the sound barrier, than the transition from subsonic to supersonic flight must have been very close.

COOL photo!

Chris  Smile



"Just a minute while I re-invent myself"
User currently offlinePeterba69 From United States of America, joined Mar 2002, 70 posts, RR: 0
Reply 5, posted (12 years 5 months 1 week 13 hours ago) and read 3169 times:

Here's a link to some cool shots in SFO, check the rest of this guys site as well:http://www.airshowaction.com/flw98/flw98.html

User currently offlineCaptjetblast From Argentina, joined Aug 2001, 281 posts, RR: 0
Reply 6, posted (12 years 5 months 1 week 12 hours ago) and read 3229 times:

...
http://www.wilk4.com/misc/soundbreak.htm#video


User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 7, posted (12 years 5 months 1 week 12 hours ago) and read 3165 times:

This should help your link Capjetblast.

http://www.wilk4.com/misc/soundbreak.htm#video.com

Chris  Smile



"Just a minute while I re-invent myself"
User currently offlineCaptjetblast From Argentina, joined Aug 2001, 281 posts, RR: 0
Reply 8, posted (12 years 5 months 1 week 12 hours ago) and read 3157 times:

http://faculty.rmwc.edu/tmichalik/movies/F-18.MPEG

User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 9, posted (12 years 5 months 6 days 13 hours ago) and read 3067 times:

Hello Captjetblast.

I suspect that your links are not working because you're forgeting to add the .com and the two arows < > before and after the address. That's all I've been adding to get your links to work.

OK, lets check out this site. Thanks for the link.

http://faculty.rmwc.edu/tmichalik/movies/F-18.MPEG.com

Well, it appears that the link is not active.

Chris  Smile



"Just a minute while I re-invent myself"
User currently offlineAccidentally From United States of America, joined Dec 2000, 643 posts, RR: 0
Reply 10, posted (12 years 5 months 6 days 4 hours ago) and read 3038 times:
Support Airliners.net - become a First Class Member!

http://faculty.rmwc.edu/tmichalik/movies/F-18.MPEG


Cory Crabtree - crab453 - Indianapolis - 2R2 - 1966 PA-32-260
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