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Premium Member
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The Duchess actually had four double acting cylinders, so there are 8 chuffs per revolution, but you only hear four, because the inside cylinders are 180 degrees out of phase with the outside.


I'll grant you that "Cutting the speed down to half is not fair comparison of the sound! That really changes the sound."

Here is the unedited clip...

She gets going so fast, you really don't hear the chuffs that well after launch.
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