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8 years, 10 months ago
additional:
You may wonder why the main Engine sounds harder and harder while at same rotations per minute. When you want the ship to go faster, you don't increase the rotations per minute, because you may already be at maximum. Instead you adjust the propellant blade angle, which forces the water to pass faster, and the Engine has to work harder. Emma's Engine got ten cylinders and the max Power is 110,000 HP !!
When you do a sound record, you don't hear all cylinders, but one or two to Three dominates.One way to get a perfect record may be to use many microphones.