Strange Gyro Behaviour?

[Tim]

I have just been checking over my Raptor, prior to (weather permitting)
going flying tomorrow. I noticed some strange behaviour from the tail rotor
servo/gyro (JR 810G and CSM 400).

If I apply full left rudder (in non-HH mode), the servo zips the rudder over
and stops. When I release the stick, the servo zips back to neutral, as you
would expect. However, "neutral" seems to be different, depending on whether
the servo is returning from right or left rudder. Surely this can't be
right? I have tried to get the linkage running as freely as possible and
there don't appear to be any burrs on the shaft, though the overall
mechanism is perhaps not as free as I would have expected. In fact, I
disconnected the linkage and found that the servo horn still doesn't return
to the same neutral, so it appears to be an electrical issue.

Does this suggest a gyro problem, a servo problem, low batteries (now on
charge prior to tomorrow's session), something else or "none of the above"?

Any thoughts?

Thanks.

Tim


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.522 / Virus Database: 320 - Release Date: 29/09/2003

[Eddie]

Tim,
I"m pretty sure this is normal in HH mode. My GY401 does the same
and I did read somewhere (possibly Runryder) where this was normal. Does it
do it in normal mode?

Eddie


"Tim" <void@invalidemail.com> wrote in message
news:bdWeb.13427$Ia1.5683@news-binary.blueyonder.co.uk...
> I have just been checking over my Raptor, prior to (weather permitting)
> going flying tomorrow. I noticed some strange behaviour from the tail
rotor
> servo/gyro (JR 810G and CSM 400).
>
> If I apply full left rudder (in non-HH mode), the servo zips the rudder
over
> and stops. When I release the stick, the servo zips back to neutral, as
you
> would expect. However, "neutral" seems to be different, depending on
whether
> the servo is returning from right or left rudder. Surely this can't be
> right? I have tried to get the linkage running as freely as possible and
> there don't appear to be any burrs on the shaft, though the overall
> mechanism is perhaps not as free as I would have expected. In fact, I
> disconnected the linkage and found that the servo horn still doesn't
return
> to the same neutral, so it appears to be an electrical issue.
>
> Does this suggest a gyro problem, a servo problem, low batteries (now on
> charge prior to tomorrow's session), something else or "none of the
above"?
>
> Any thoughts?
>
> Thanks.
>
> Tim
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.522 / Virus Database: 320 - Release Date: 29/09/2003
>
>

[Carl Farrington]

Eddie almost properly wrote:
>
> "Tim" <void@invalidemail.com> wrote in message
> news:bdWeb.13427$Ia1.5683@news-binary.blueyonder.co.uk...
>>
>> I have just been checking over my Raptor, prior to (weather
>> permitting) going flying tomorrow. I noticed some strange behaviour
>> from the tail rotor servo/gyro (JR 810G and CSM 400).
>>
>> If I apply full left rudder (in non-HH mode), the servo zips the
>> rudder over and stops. When I release the stick, the servo zips back
>> to neutral, as you would expect. However, "neutral" seems to be
>> different, depending on whether the servo is returning from right or
>> left rudder. Surely this can't be right? I have tried to get the
>> linkage running as freely as possible and there don't appear to be
>> any burrs on the shaft, though the overall mechanism is perhaps not
>> as free as I would have expected. In fact, I disconnected the
>> linkage and found that the servo horn still doesn't return to the
>> same neutral, so it appears to be an electrical issue.
>>
>> Does this suggest a gyro problem, a servo problem, low batteries
>> (now on charge prior to tomorrow's session), something else or "none
>> of the above"?
>>
>> Any thoughts?
>>
>> Thanks.
>>
>> Tim
>>
>>

> Tim,
> I"m pretty sure this is normal in HH mode. My GY401 does the
> same and I did read somewhere (possibly Runryder) where this was
> normal. Does it do it in normal mode?
>
> Eddie

I'm pretty sure normal-mode is what he's talking about

>
>
>> ---
^^^^ That should be 'dash dash <space> <newline>' which is why it isn't
being removed when people reply.
>> Outgoing mail is certified Virus Free.
>> Checked by AVG anti-virus system (http://www.grisoft.com).
>> Version: 6.0.522 / Virus Database: 320 - Release Date: 29/09/2003

[Eddie]

DOH!

Sorry......




"Carl Farrington" <carl@000compsup000.net> wrote in message
news:blmb19$cc3$1$8300dec7@news.demon.co.uk...
> Eddie almost properly wrote:
> >
> > "Tim" <void@invalidemail.com> wrote in message
> > news:bdWeb.13427$Ia1.5683@news-binary.blueyonder.co.uk...
> >>
> >> I have just been checking over my Raptor, prior to (weather
> >> permitting) going flying tomorrow. I noticed some strange behaviour
> >> from the tail rotor servo/gyro (JR 810G and CSM 400).
> >>
> >> If I apply full left rudder (in non-HH mode), the servo zips the
> >> rudder over and stops. When I release the stick, the servo zips back
> >> to neutral, as you would expect. However, "neutral" seems to be
> >> different, depending on whether the servo is returning from right or
> >> left rudder. Surely this can't be right? I have tried to get the
> >> linkage running as freely as possible and there don't appear to be
> >> any burrs on the shaft, though the overall mechanism is perhaps not
> >> as free as I would have expected. In fact, I disconnected the
> >> linkage and found that the servo horn still doesn't return to the
> >> same neutral, so it appears to be an electrical issue.
> >>
> >> Does this suggest a gyro problem, a servo problem, low batteries
> >> (now on charge prior to tomorrow's session), something else or "none
> >> of the above"?
> >>
> >> Any thoughts?
> >>
> >> Thanks.
> >>
> >> Tim
> >>
> >>
>
> > Tim,
> > I"m pretty sure this is normal in HH mode. My GY401 does the
> > same and I did read somewhere (possibly Runryder) where this was
> > normal. Does it do it in normal mode?
> >
> > Eddie
>
> I'm pretty sure normal-mode is what he's talking about
>
> >
> >
> >> ---
> ^^^^ That should be 'dash dash <space> <newline>' which is why it isn't
> being removed when people reply.
> >> Outgoing mail is certified Virus Free.
> >> Checked by AVG anti-virus system (http://www.grisoft.com).
> >> Version: 6.0.522 / Virus Database: 320 - Release Date: 29/09/2003
>
>

[Tim]

<snip>
> > >>
> >
> > > Tim,
> > > I"m pretty sure this is normal in HH mode. My GY401 does the
> > > same and I did read somewhere (possibly Runryder) where this was
> > > normal. Does it do it in normal mode?
> > >
> > > Eddie
> >
> > I'm pretty sure normal-mode is what he's talking about
> >
<snip>

Yes, I was talking about normal mode, but having flown yesterday, it doesn't
actually seem to cause any problems.

Tim


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.522 / Virus Database: 320 - Release Date: 29/09/2003