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Did The SR-71A (At High Speed) Glow Inflight?  
User currently offlineBlackbird From , joined Dec 1969, posts, RR:
Posted (6 years 12 months 10 hours ago) and read 8337 times:

Did the SR-71 glow inflight at high-speed from kinetic heating (not counting the exhaust plume)

Andrea

12 replies: All unread, jump to last
 
User currently offlineKC135TopBoom From United States of America, joined Jan 2005, 12210 posts, RR: 51
Reply 1, posted (6 years 12 months 8 hours ago) and read 8316 times:

No, IIRC, the outside skin temps ran between 300 degrees F and 600 degrees F. These are not near enough to make titanium glow, but is enough to make skin panels expand to seal the fuel leaks.

User currently offlineHaveBlue From United States of America, joined Jan 2004, 2141 posts, RR: 1
Reply 2, posted (6 years 12 months 2 hours ago) and read 8227 times:

Parts of the airframe were between 800 and 1,200 degrees F iirc.


Here Here for Severe Clear!
User currently offlineVzlet From United States of America, joined Mar 2004, 839 posts, RR: 0
Reply 3, posted (6 years 12 months ago) and read 8188 times:



Quoting Blackbird (Thread starter):
Did the SR-71 glow inflight at high-speed

Certainly in the IR spectrum...



"That's so stupid! If they're so secret, why are they out where everyone can see them?" - my kid
User currently offlineN328KF From United States of America, joined May 2004, 6508 posts, RR: 3
Reply 4, posted (6 years 11 months 4 weeks 1 day 13 hours ago) and read 7945 times:



Quoting Vzlet (Reply 3):
Certainly in the IR spectrum...

Gee willikers. So does my Passat!



When they call the roll in the Senate, the Senators do not know whether to answer 'Present' or 'Not guilty.' T.Roosevelt
User currently offlineVzlet From United States of America, joined Mar 2004, 839 posts, RR: 0
Reply 5, posted (6 years 11 months 4 weeks 1 day ago) and read 7825 times:



Quoting N328KF (Reply 4):
So does my Passat!

Hmmm... Have you tried using a JP-7/ethanol blend?



"That's so stupid! If they're so secret, why are they out where everyone can see them?" - my kid
User currently offlineBlackbird From , joined Dec 1969, posts, RR:
Reply 6, posted (6 years 11 months 4 weeks 20 hours ago) and read 7781 times:

At what temperature does titanium, stainless-steel, and aluminum become incandescent at?

User currently offlineKC135TopBoom From United States of America, joined Jan 2005, 12210 posts, RR: 51
Reply 7, posted (6 years 11 months 4 weeks 13 hours ago) and read 7677 times:



Quoting Blackbird (Reply 6):
At what temperature does titanium, stainless-steel, and aluminum become incandescent at?

steel/stainless steel will begin glowing around 1100 degrees F, titanium needs to be a lot hotter than that, maybe closer to 1500 degrees F. But, IIRC even the "turkey feathers" didn't glow that much.


User currently offlineSP90 From United States of America, joined May 2006, 388 posts, RR: 0
Reply 8, posted (6 years 11 months 3 weeks 6 days 20 hours ago) and read 7575 times:



Quoting KC135TopBoom (Reply 7):
turkey feathers

The what?  Confused


User currently offlineHaveBlue From United States of America, joined Jan 2004, 2141 posts, RR: 1
Reply 9, posted (6 years 11 months 3 weeks 6 days 16 hours ago) and read 7522 times:

Quoting SP90 (Reply 8):
Quoting KC135TopBoom (Reply 7):
turkey feathers

The what?

Turkey Feathers is a nickname for the variable diameter exhaust nozzle 'segments' on some fighter and bomber jets. They could be wide open or closed down to a much smaller hole depending on the power setting.

As seen here, for example, on the F-16.

http://img301.imageshack.us/img301/5935/pwnozzlekj5.jpg

[Edited 2008-03-07 15:11:23]


Here Here for Severe Clear!
User currently offlineSP90 From United States of America, joined May 2006, 388 posts, RR: 0
Reply 10, posted (6 years 11 months 3 weeks 3 days 16 hours ago) and read 7283 times:



Quoting HaveBlue (Reply 9):
Turkey Feathers is a nickname for the variable diameter exhaust nozzle 'segments' on some fighter and bomber jets. They could be wide open or closed down to a much smaller hole depending on the power setting.

As seen here, for example, on the F-16.

I can see the resemblance now. Thanks for the info.


User currently offlineSprout5199 From United States of America, joined Feb 2005, 1858 posts, RR: 2
Reply 11, posted (6 years 11 months 3 weeks 3 days 13 hours ago) and read 7252 times:

The engines did:



Dan in Jupiter


User currently offlinePhatAlbert From United States of America, joined Oct 2005, 113 posts, RR: 3
Reply 12, posted (6 years 11 months 3 weeks 3 days 11 hours ago) and read 7227 times:



Quoting Sprout5199 (Reply 11):
The engines did

Thats pretty neat... Smorfs anyone?



**Isaac**
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