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rare_bear -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/4/2005 2:17:08 AM)
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i believe i've solved my problem. i took the pushrods out and the part that makes a right angle bend into the servo arm had a slight radius bend to it. not very much but enough to cause binding to occur when the strapper was clamped down with the fuel line. the additional compression caused the servo arm to be pushed into the radius bend causing some binding to occur.
the fix was to take the pushrods out to the vice in the garage and hammer into them a nice tight right angle. then with a very fine file, smooth out any burrs due to hammer whacking. it worked, the servo's are much cleaner now. the low torque servo still buzzes slightly but the high torque elevator servo is buzz free. i will replace the rudder servo with a high torque (which is really overkill in my opinion) to eliminate all buzzing... but since i have an extra high torque servo, i might as well just go ahead and use it.
in my next ARF, i think i'll just gut the pushrod sleeves upfront as i have done on other ARF kits. i'm feeling kind of lazy with this ARF kit and want to get it in the air. i may go back and gut them out at a later point in time. also, i believe that when the engine is running, any slight buzzing might be relieved by engine vibration as that vibration breaks the static frictional forces between the pushrods and tubes thus letting the servo's settle out on a continual basis.
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