A planetary reduction like on a PT6 or double helical reduction like on a Merlin
A question for those who may know; Which of the above is the better?
Or is it a case of 6 of one and half a dozen of the other?
Currawong; Any idea what was used in various other engines such as the big radials?
And BTW, what was used in the GTSIOs used in the C404/421 series?