Quote:
Originally Posted by Viper2000
They are connected together with a fixed ratio gear box so it amounts to the same thing...
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Yes, I see now, a 3000rpm propella ,de Havilland 9 ft 8 in (2.97 m) diameter would run at about 466m/s, a bit faster than sound
And at 1431, it's only about 222m/s.