Originally Posted by
chuks
I bet that a CV-580 is longer than a CV-440. If so, that would give a longer arm for the rudder, no? That or else that the Allison engines are de-rated for takeoff.
No, they made the vertical fin and rudder taller. The CV-5800 is stretched. The Allisons are limited by what the props can handle but still over a thousand more horsepower a side than the R2800s. The Darts on the CV-600/640s are about 500 more HP wet with no airframe modifications.