Some interesting information...
According to the Flight Data Recorder from UA93, it impacted the ground at about 500kts (575 MPH) in a 40 degree nose down attitude, with a 150 degree roll angle to starboard.
In addition:
1. Cabin pressure - NORMAL
2. Hydraulics - NORMAL
3. Cargo fire - NORMAL
4. Smoke - NORMAL
5. Engines - RUNNING
6. Engine RPM (N1) 70%
7. Fuel pressure - NORMAL
8. Engine vibration - LO
9. Wind direction - WEST
10. Wind speed - 25 kts
To my way of thinking, this means a number of things:
A) UA93 was involved in a controlled flight collision with the ground - the entire airframe was intact at impact
i.e. it wasn't shot down.
B) The wind speed was almost twice previously reported, and would have moved the mushroom cloud CLOSER to Val as well as lateral to Val.
C) The angle of impact was shallower than I previously realised, resulting in a forward motion of light debris/fireball from the impact (explaining further the position of the mushroom cloud as WELL as the light debris scattered towards the lake)
D) The speed of impact was significantly higher than previously claimed - I had always heard about 500 MPH - it was actually 575 MPH. Combined with the shallower impact angle this further supports the movement of the mushroom cloud.
End result? The actual data from the Flight Data Recorder further supports the claim that Val's photo is accurate and genuine.
(Incidentally, the FBI have authenticated the photo, so it's not a fake - unless you believe the FBI is in on it, at which point you're lost to woo land).
The FDR report can be found
here.
For laymen, someone on a professional pilot's forum has provided the key specs at impact
here.
-Andrew