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Man, those fighter pilots goin 1000 knots have it rough. Whats that work out to? 105 degrees of bank? Just kidding. But i wonder at what point that formula no longer is accurate.
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That formula is for light, low-speed training aircraft (according to Jeppesen). High speed aircraft have their turn and bank indicators calibrated for half-standard rate turns (1.5 degrees per second) to keep bank angles from getting absurd.