I have a smooth running Legacy RG IO-550 with a three blade Hartzell scimitar prop, HC-J3YF-1RF/F7391D-3/SM7. 

 

According to Hartzell's website, this is the recommended three blade scimitar prop for the Legacy RG with IO-550 engine.  It is a 72" diameter prop, not the 78" prop mentioned in Bob R's posting.  I thought all the scimitar props on Legacys were the same as mine.

 

 

I consider mine to be "smooth," but that is a terribly subjective concept.  However, I can say for sure that I do not feel vibration in the stick and don't see any aileron vibration or wing tip vibration.  Another Legacy builder and pilot commented on how smooth mine is, but maybe he was just being polite.   

 

Unless there is a way to quantify "vibration" and "smoothness," I don't see how we can accurately communicate about this.  One person's rough could be another person's smooth.  Maybe if someone had a video of stick shake or aileron shake?  A glass of water sitting on the glare shield? 

 

Dennis

Legacy 625 hours