USAF released accident report on fatal TU-2 Crash at Beale AFB last year
https://www.stripes.com/air-force-relea ... QQy5fnyvZ4
Comments Here: http://aviationweek.com/military-traine ... ash?page=1
Dragon Lady Down
- D5CAV
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Dragon Lady Down
“None are more hopelessly enslaved than those who falsely believe they are free.” Johann Wolfgang von Goethe
- D5CAV
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- Joined: Tue Aug 19, 2008 2:48 am
Re: Dragon Lady Down
I've got an acquaintance who pilots U2s out of Beale. I haven't seen him recently to ask him about this incident.
About a year ago, we were talking about the challenges of flying the U2. He casually mentioned that the U2 stall speed was a little over 400 knots at cruise altitude. That got my attention!
I asked "I thought the U2 max speed was a little over 400 knots."
He said, "Yes, the difference between max speed and stall speed is under 20 knots at cruise altitude."
I asked, "How to you manage that flight envelope?"
He said "very carefully!"
There's a reason U2 is called "The Dragon Lady"!
About a year ago, we were talking about the challenges of flying the U2. He casually mentioned that the U2 stall speed was a little over 400 knots at cruise altitude. That got my attention!
I asked "I thought the U2 max speed was a little over 400 knots."
He said, "Yes, the difference between max speed and stall speed is under 20 knots at cruise altitude."
I asked, "How to you manage that flight envelope?"
He said "very carefully!"
There's a reason U2 is called "The Dragon Lady"!
“None are more hopelessly enslaved than those who falsely believe they are free.” Johann Wolfgang von Goethe
- Jericho941
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Re: Dragon Lady Down
Yep. At that altitude the speed of sound is so slow you actually risk going transonic if you go too fast, which would tear the aircraft apart. It's also so thin that your stall speed is incredibly fast. The U-2 is not a forgiving aircraft.
- Netpackrat
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Re: Dragon Lady Down
Cognosce teipsum et disce pati
"People come and go in our lives, especially the online ones. Some leave a fond memory, and some a bad taste." -Aesop
"People come and go in our lives, especially the online ones. Some leave a fond memory, and some a bad taste." -Aesop
- Jericho941
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Re: Dragon Lady Down
A bit less spectacular than the way it was explained to me, heh.When the airplane exceeds its critical Mach number (such as during stall prevention or recovery), then drag increases or Mach tuck occurs, which can cause the aircraft to upset, lose control, and lose altitude. In either case, as the airplane falls, it could gain speed and then structural failure could occur, typically due to excessive g forces during the pullout phase of the recovery.
- Windy Wilson
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Re: Dragon Lady Down
This must be from the same editorial board that came up with "hard start" as a euphemism for an explosion on the launch pad in rocketry.Jericho941 wrote:A bit less spectacular than the way it was explained to me, heh.When the airplane exceeds its critical Mach number (such as during stall prevention or recovery), then drag increases or Mach tuck occurs, which can cause the aircraft to upset, lose control, and lose altitude. In either case, as the airplane falls, it could gain speed and then structural failure could occur, typically due to excessive g forces during the pullout phase of the recovery.
The use of the word "but" usually indicates that everything preceding it in a sentence is a lie.
E.g.:
"I believe in Freedom of Speech, but". . .
"I support the Second Amendment, but". . .
--Randy
E.g.:
"I believe in Freedom of Speech, but". . .
"I support the Second Amendment, but". . .
--Randy
- Netpackrat
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Re: Dragon Lady Down
Same people who coined the phrase, "controlled flight into terrain" I think.
Cognosce teipsum et disce pati
"People come and go in our lives, especially the online ones. Some leave a fond memory, and some a bad taste." -Aesop
"People come and go in our lives, especially the online ones. Some leave a fond memory, and some a bad taste." -Aesop
- Mike OTDP
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Re: Dragon Lady Down
RQ-4s are the same way. Not much margin between stall and critical Mach. It takes time to back down from high altitude to the point where you can really start descending.