Todd Carrico wrote:

How about... TC-13b ;-)

Why would you have to have a variable speed drive?

Todd Carrico

To optimise the turbine speed for both cruise power and 
takeoff power. You could over speed the turbine if it
was optimised for cruise alone. One could measure the 
turbine speed and use a computer controlled waste 
gate instead. Allison just cared about max power I guess.

 
Paul Lamar
 
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