posted on May, 1 2013 @ 05:20 PM
There's an animation out that shows what may have happened with a cargo shift, but it's flawed, in that it says that after the nose pitched up, the
engines stalled. When the nose pitches up like that, the wings stall, not the engines. The engines will still be producing power, and operating
normally, but the angle of attack of the wing is so great that the air can no longer flow over it, and it stops generating lift.
Very basic flight physics. If you look at a wing, the top portion is curved, and the bottom is flatter. As the plane starts rolling down the runway,
the air going over the top of the wing has to flow faster than the air over the bottom, which creates a pressure differential. The air under the wing
pushes up, which pushes the wing up, which lifts the aircraft with it.
As you climb, the angle of the wing, relative to the airflow changes. This is known as the Angle of Attack, or AoA. You can only increase this so
far, before air stops flowing over the wing, and starts swirling off the top of it. Once this happens, the wing stops producing lift, and you enter
what's known as a stall. To correct a stall, you have to recognize it and almost immediately push the nose down. This gets the wing back to where
it's producing lift again, and increases your speed (most stalls are the result of a slow speed climbing situation).
Depending on how far you have to push the nose down, you build your speed up, then gently pull back on the stick to bring the nose up again. Now with
the departure from Bagram, you're already getting close to a stall, as when you get airborne, you pull your nose up to about the maximum that the
aircraft can handle. If the load shifted to the back, that would force the nose to go up farther, which would put the aircraft into a stall
condition. The engines would still be operating at whatever thrust setting the throttles were set to, and producing thrust, but the wings wouldn't
be producing lift. At the altitude the aircraft was at, a stall condition is almost always fatal. You have much less time to react to a stall than
if they were even 2-3000 feet higher, and if you can't immediately get the nose down and the wings back to a lift producing angle, you have
absolutely no time left to react and recover.