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39,000 RPM ????
Let's say the compressor blades are 4 feet in diameter. That means a circumference of about 12.6 feet. So they're moving 12.6 feet 39,000 times every minute, that's 490,088 ft per minute, 8,168 ft per second, or 5,569 miles per hour, roughly mach 7.3 at sea level under standard conditions. Wouldn't the engine disintegrate at these speeds?
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Yup, I remember those numbers from Beech 1900 training.
I failed to ask Juergen at what point the engine is running at 8,900 -- which seems pretty low if you ask me.