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Head...I am flying the two bladed head 702-40 and using the 419 blades (815mm) along with the helitronix mixer and a 401 gyro on the elevator... once set this unit flies very well and though there is a bit of a different feel, it does not take to long to get used to it... the "heavier" the blades are the better it seems to fly.... I fly unpainted for practice and my painted set for events and you can feel the difference... I like the painted blades best...
Hope this will help you out..... Stan
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft