The Turbofan engine had been conceptualized because of the Noise from the exhaust of a turbojet.
Err..... point of order Mr. Chairman.
Whittle
conceptualized the multi spool, high bypass fan jet a long, long time before it was possible, let alone fashionable. He knew that a very large volume of relatively slow moving air was much more efficient than a small volume of very fast moving air, but he had to put up with what was
just possible in 1936.
The fact that a High Bypass fan jet is orders of magnitude quieter than a plain turbojet is by way of being a bonus, it was efficiency Mr. Whittle sought.
