Или сервы кривые.
нашел интересны отзыв на хоббях:
Well, what can I say, these are tough little buggers. I placed 4 of them on my 450 clone and being that I'm used to flying my t-rex 450 sport I must say I had difficulty flying it at first, as the servo reaction time was mucho slow to me. for tail control ,just forget it as I tried a circuit at high speed at the beach and it almost took full rudder to barely make the turn before I noticed I was in a turn (waaay to slllloooow). I tried adjusting the gain on the hk401 gyro, did a test hover, the heli spun outta control ....struck an antique car I had parked nearby...needless to say, blades , main shaft, tail boom,flybar rod, all gone, but amazingly the pitch servo case almost obliterated ...but working fine ,despite that catastrophic ,annihilating explosion. Like I said ...tough little buggers ....but sllllooooowww.
Причем с какого-то момента их будто подменили, до этого было что-то типа:
Great little servo. Anyone know the operating hz? I'm using on 450 as tail servo great for the price, quiet, strong, centers well, and digital and cheap.