* G-Force, not Mach Speed: Passing out (G-LOC, or G-force-induced loss of consciousness) is primarily caused by high G-forces, not directly by Mach speed. G-force is a measure of acceleration, and it's what pushes blood away from the brain, leading to a lack of oxygen.
* Individual Variation: Pilots have different tolerances to G-forces. Factors like physical condition, training, and even the specific G-force profile (how quickly it builds) play a role.
* Maneuvers: It's not the Mach speed itself that causes G-forces. It's the maneuvers the pilot performs at those speeds. Tight turns, rapid climbs, and other high-G maneuvers can cause pilots to experience G-LOC even at relatively low speeds.
Here's what can happen:
* High-G maneuvers: During maneuvers like high-speed turns or dives, the pilot experiences increased G-forces. This can lead to "red-out" (vision blurring) and eventually, if the G-force is sustained, to G-LOC.
* Different Types of G-Forces: G-forces can be positive (pushing you down) or negative (pulling you up). Positive G-forces are more common in aviation and can cause blood to pool in the legs, reducing blood flow to the brain. Negative G-forces are less common but can cause blood to rush to the head.
To Summarize:
It's inaccurate to say there's a specific Mach speed at which pilots pass out. It depends on the G-forces experienced during maneuvers, individual tolerance, and other factors.
Important Note: G-LOC is a serious danger in aviation. Pilots are trained extensively to recognize the symptoms and use techniques like the Anti-G straining maneuver to help combat the effects of G-forces.
