I,m sure P&W and Hamilton spent more time than putting a few figures on the back of a fag packet to optimise the best combination for North Americans demand for the engine / prop , I always thought that the noise was due to the fact that the engine had no reduction gear [for cheapness and relibability remember it was a training airplane] and the tips of the props were moving very fast
i'm more than ready to be "shot down in flames"
Last edited by avionic type; 14th Feb 2010 at 13:30.
Reason: too many "due to the facts"