After my initial flight of the Walkera #38 CH-47, I realized the servo travel was inadequate to effectively control the heli and decided to increase servo travel and control sensitivity by turning the EXTENT adjustment screw 1/4 of a turn CCW. This gave me the extra control I needed without having to physically move the position of the pushrods on the bellcranks as some other Walkera #38 owners have done.
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