Heading hold Gyro

[Peter Seddon]

I have just fitted a HHG to a new heli and noticed that whilst on the ground
the rudder servo 'twitters' and seems to take up a new position quite
readily - is this normal? If it is and I guess that as the heli is still on
the ground with no engine running then anything might happen, what should I
do about getting the rudder servo centralised?

Regards Peter

[Carl Farrington]

Peter Seddon wrote:
> I have just fitted a HHG to a new heli and noticed that whilst on the
> ground the rudder servo 'twitters' and seems to take up a new
> position quite readily - is this normal? If it is and I guess that as
> the heli is still on the ground with no engine running then anything
> might happen, what should I do about getting the rudder servo
> centralised?
>
> Regards Peter

This is normal. It is the gyro trying to get the heli to move a little, not
suceeding (since the heli is on the ground) and so trying harder. It will do
this until it's moved all the way over and can't put any more tail control
in. Simply wiggle the tail a touch and it'll kind of centre. Do this before
takeoff and all will be fine.

[Carl Farrington]

Carl Farrington wrote:
> Peter Seddon wrote:
>> I have just fitted a HHG to a new heli and noticed that whilst on the
>> ground the rudder servo 'twitters' and seems to take up a new
>> position quite readily - is this normal? If it is and I guess that as
>> the heli is still on the ground with no engine running then anything
>> might happen, what should I do about getting the rudder servo
>> centralised?
>>
>> Regards Peter
>
> This is normal. It is the gyro trying to get the heli to move a
> little, not suceeding (since the heli is on the ground) and so trying
> harder. It will do this until it's moved all the way over and can't
> put any more tail control in. Simply wiggle the tail a touch and
> it'll kind of centre. Do this before takeoff and all will be fine.

I meant the tail 'stick', not the tail :-)

[Peter Seddon]

Thanks Carl - I was hoping that was what it was.

Regards Peter

"Carl Farrington" <carl@000compsup000.net> wrote in message
news:bcqom0$52j$1$8302bc10@news.demon.co.uk...
> Carl Farrington wrote:
> > Peter Seddon wrote:
> >> I have just fitted a HHG to a new heli and noticed that whilst on the
> >> ground the rudder servo 'twitters' and seems to take up a new
> >> position quite readily - is this normal? If it is and I guess that as
> >> the heli is still on the ground with no engine running then anything
> >> might happen, what should I do about getting the rudder servo
> >> centralised?
> >>
> >> Regards Peter
> >
> > This is normal. It is the gyro trying to get the heli to move a
> > little, not suceeding (since the heli is on the ground) and so trying
> > harder. It will do this until it's moved all the way over and can't
> > put any more tail control in. Simply wiggle the tail a touch and
> > it'll kind of centre. Do this before takeoff and all will be fine.
>
> I meant the tail 'stick', not the tail :-)
>
>

You'll find that once the heli starts to get very close to hover speed, the
gyro will all of a sudden hold the tail rigid. It looks dauting, but you
get used to it.

Enjoy your new toy!

Jon

"Peter Seddon" <peter@seddonp.freeserve.co.uk> wrote in message
news:bcq22b$q6n$1@news7.svr.pol.co.uk...
> I have just fitted a HHG to a new heli and noticed that whilst on the
ground
> the rudder servo 'twitters' and seems to take up a new position quite
> readily - is this normal? If it is and I guess that as the heli is still
on
> the ground with no engine running then anything might happen, what should
I
> do about getting the rudder servo centralised?
>
> Regards Peter
>
>