Mr Spaceman
Topic Author
Posts: 2723
Joined: Thu Mar 15, 2001 5:09 am

B-1B Bomber Shock Wave Vapour?

Thu Jul 18, 2002 2:57 am

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"
 
Mr Spaceman
Topic Author
Posts: 2723
Joined: Thu Mar 15, 2001 5:09 am

RE: B-1B Bomber Shock Wave Vapour?

Fri Jul 19, 2002 12:35 am

Hi guys.

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

Chris  Smile
"Just a minute while I re-invent myself"
 
nikes
Posts: 38
Joined: Mon Aug 27, 2001 9:26 am

RE: B-1B Bomber Shock Wave Vapour?

Fri Jul 19, 2002 1:34 am

- 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
 
peterba69
Posts: 147
Joined: Fri Mar 01, 2002 9:31 am

RE: B-1B Bomber Shock Wave Vapour?

Fri Jul 19, 2002 1:53 am

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.
 
Mr Spaceman
Topic Author
Posts: 2723
Joined: Thu Mar 15, 2001 5:09 am

RE: B-1B Bomber Shock Wave Vapour?

Fri Jul 19, 2002 2:01 am

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"
 
peterba69
Posts: 147
Joined: Fri Mar 01, 2002 9:31 am

RE: B-1B Bomber Shock Wave Vapour?

Fri Jul 19, 2002 2:12 am

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
 
captjetblast
Posts: 288
Joined: Thu Aug 30, 2001 5:59 am

See The Video At...

Fri Jul 19, 2002 2:52 am

...
http://www.wilk4.com/misc/soundbreak.htm#video
 
Mr Spaceman
Topic Author
Posts: 2723
Joined: Thu Mar 15, 2001 5:09 am

RE: B-1B Bomber Shock Wave Vapour?

Fri Jul 19, 2002 2:57 am

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"
 
captjetblast
Posts: 288
Joined: Thu Aug 30, 2001 5:59 am

Another One

Fri Jul 19, 2002 3:05 am

http://faculty.rmwc.edu/tmichalik/movies/F-18.MPEG
 
Mr Spaceman
Topic Author
Posts: 2723
Joined: Thu Mar 15, 2001 5:09 am

RE: B-1B Bomber Shock Wave Vapour?

Sat Jul 20, 2002 2:12 am

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"
 
Accidentally
Posts: 613
Joined: Sun Dec 10, 2000 7:33 am

RE: B-1B Bomber Shock Wave Vapour?

Sat Jul 20, 2002 11:22 am

Indianapolis, IN

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