Although stunt planes are designed to easily withstand very high G-forces of up to 10 or even 12 Gs, stunt pilots who provide rides to the general public rarely perform maneuvers that exceed 4 Gs. This is because the average person does not have special training to handle more than 4 or 5 Gs.

Yes, 10 G-force is an extraordinary amount of physical stress that far exceeds what a typical human body can endure without specialized equipment or training. One "G" is the force of Earth's gravity at sea level; at 10 Gs, an individual feels ten times their actual body weight. For instance, a 180-pound person would effectively feel like they weigh 1,800 pounds. At this level of force, the heart struggles to pump blood upward toward the brain, leading to a phenomenon called "G-LOC" (G-induced Loss of Consciousness). Most untrained humans will black out at around 4 to 5 Gs. Modern fighter pilots and Formula 1 drivers can sometimes withstand 9 or 10 Gs for very brief intervals, but only by using "G-suits" that compress the lower body to keep blood in the brain and by performing specialized "anti-G" breathing maneuvers. Prolonged exposure to 10 Gs would likely cause internal organ damage, burst blood vessels (G-measles), and eventually death. For context, a high-intensity roller coaster usually peaks around 4 Gs, and a space shuttle launch involves about 3 Gs. 10 Gs is the threshold of extreme structural and physiological limits, reserved for high-performance aerobatics or emergency ejections.