Originally Posted by GordonTarling
OK, thanks for your opinions chaps. I can see that the lower props on a Y6 will always be working in the downwash of the upper props and that this could lead to vibes etc., but I can also see that the Y6 is going to be more controllable if a motor should stop in flight. I guess it's all down to a series of compromises, as always!
You wont see anymore vibes because of the coax design of a Y6. You will however find they are a bit less efficient. The trade off is they are MUCH smoother in the wind and for that reason I will be moving from a flat hex to a Y6 on my main machine.