Beware of the HS-125MG thin wing servo. Well I almost lost my electric Neocat/Bobcat last night because of the servo, which I put into the stab like many others here. Fifth flight, servo was bought new. When I plugged in the batts, I noticed the elevator was way out of trim since the day before. I figured it was something I did somehow, so I re-trimmed it and took off. All was well for the first couple minutes. Then, all of a sudden, she wanted to dive. I used all of my up trim and had to hold back on the stick, and was able to get her back safely and without issue.

When I got on the ground, I was started checking things and playing with the elevator trim when it suddenly went to full up. Servo still worked fine, but basically kept finding new centers every few minutes and twitching. I'm lucky that it did not go to full up or full down while in the air.

Naturally I assumed that the problem was something other than the servo, as 99% of my planes have Hitec servos, and I have never had a problem with them. I checked everything including linkages, connections, etc. Plugged the servo into a different channel, and it was still doing weird things. I then remembered that the plane needed elevator trim a few times before, but it was no where near as severe. It was windy when I flew it last time, so I thought that may have been the culprit. I now know the servo was acting wacky since the second I first gave it power.

I then did some research on assorted forums, and found that quite a few other modelers have had the same problems with this servo and it's digital counterpart (HS-5152), and have even lost planes because of it.

So I would be very weary of this servo. I will switch this one out with something else. Anyone know of a good JR/Futaba servo with the same dimensions? Thanks. -Chris