About a year ago I had a problem with some HS-205MG Hitec servos, or so
I thought!
On landing they would seem to find a new center. I would retrim and
center them and the next hard, flap dragging landing would have them out
of whack again. I though something was moving/slipping internally in the
servos.
The problem was actually my fault. I had replaced the stock servo horns
with Futaba brand horns, what I though was the same fit to the splines
on the output shaft of the Hitec servos. It was in fact just slightly
oversized. It held up fine to normal flight loads and seemed fine when
putting pressure on them by hand, but on hard landings where I didn't
get the flaps up quick enough it would jump a position and end up out of
center.
After finding the problem I replaced the horns with stock Hitec horns
and have had no problems since.
Check that the horns are not moving on the spline under extreme shock
loads like when dragging the flaps on landing.
RB
Tom Seitz wrote:
>
> After a fairly hard landing, I noticed that both of my flaps remained
> deflected several degrees when I returned them back to neutral. I seems
> something internal to the servos has permanently moved the neutral
> location. The servos seem to work fine, no slop or noise. Should I
> just subtrim them and not worry, or has some damage been done? The
> servos are Multiplex mcv2 digitals.
>
> Tom Seitz
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