Talk:1994 Fairchild Air Force Base B-52 crashの英語

The text of this article contains the following quote: "The final factor was the 10-knot tailwind that pushed the steeply banked aircraft into the accelerated stall, resulting in the crash." I am not sure where this opinion originated, but it reflects a lack of knowledge in basic aerodynamics. Unless the tailwind manifested itself in the form of windshear, which was not stated in the article, there is no way a tailwind could directly affect the stall of the aircraft. I know from my time spent as a flight instructor that student pilots often get confused on this very point. They some times believe that turning downwind in the landing pattern can cause the aircraft's airspeed to change and bring on a stall. However, this is not the case. Barring windshear, the airspeed of an aircraft in flight is unaffected by the direction that the aircraft is pointing relative to the direction that the wind is blowing across the ground. Only the ground speed is affected. For example, if an aircraft indicates an airspeed of 200 knots and the wind in its area is blowing at 10 knots over the ground, the aircraft will have a ground speed of 210 knots when flying downwind and a ground speed of 190 knots when flying upwind. The important point is that no matter which direction it is flying, it will always have an airspeed of 200 knots. Stall speed is based on airspeed, not ground speed. So changing direction in flight, in and of itself, has no effect on stall speed and will not cause the aircraft to stall. That said, the 10 knot tailwind could have had an indirect effect on this crash. Turning downwind, the aircraft's ground speed would have increased and the pilot may have steepened his turn to avoid overflying a restricted area. The steepened turn could have easily brought on an accelerated stall, stalling at a higher speed than normal, but this is an indirect cause. A tailwind does not cause accelerated stalls!