New HS-81
10-14-2007, 11:12 PM
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New HS-81
I just got 2 HS-81 servos that I want to use as throttle servos on 50cc planes. I put one in my Yak with a DA50 and 6v supply. The servo wants to stagger a center every once in a while if it's cycled from end to end. I grabbed the other one, installed it and it does the same thing. One other thing I did notice, when power is applied to the RX the HS-81's will chatter-stagger for a few seconds and then stop and respond to input. Anybody have problems with these servos? Think I should check into sending them back or send them to Hitec for replacement?
10-15-2007, 12:08 PM
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RE: New HS-81
The HS-81's are really not appropriate for that application so it's hard to say if there is a problem or just the way they are. The HS-225BB is the smallest servo I would suggest in that application.
Mike.
Mike.
10-15-2007, 01:58 PM
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RE: New HS-81
I've heard of others using it on that size engine. The HS-81 has just as much torque as the S-148 Futaba that I'm using now. I wanted the speed of the HS-81. My Futaba is only around .22 where the 81 is .09. It shouldn't take 41 oz-in of torque to move the throttle. What gets me is when the RX is powered up with the TX on, the servo will stutter for a second or so before it responds to stick input. I have another HS-81 that I got a while ago and it doesn't behave like tiese two do. I have it for throttle on a K&B .65 and it works fine.
The thottle linkage takes very little effort to move it. Both servos only do it at center position.
The thottle linkage takes very little effort to move it. Both servos only do it at center position.
10-23-2007, 08:13 PM
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RE: New HS-81
I just narrowed down my problem on my V-Bat to HS-81 servos not always finding the same center. I have tried all 4 HS 81s that I own and they hunt after stick is released. I tried a different receiver, different radio, different power pak, problem stopped with different servos. I wound up using the park zone digital servos to solve my problem, I had a couple around. I can't speak for all HS 81, they function well but not returning to same center got to be a pain. I did disassemble and try to clean everything I could, thinking maybe a dirty pot, but no difference.
09-19-2010, 09:37 AM
#6
RE: New HS-81
Iwas wondering if anyone else had problems with the Hitec H81MG servo. I sure did. One is dead from the start, and another one has quit....it only moves in one direction. This is out of 4 Brand new ones. I am going to pack them all up & send them back for a good check-up. I am sick of throwing $$$ away. John
