Csm HLG-200 gyro question

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Kevin R - 21 Aug 2004 12:51 GMT

I have a Csm HLG-200 gyro and I am defiantly not expert in helicopters I can
hover a tank full of fuel and that's my limit, the problem I have is when
you don't apply any input on the rudder the tail is rock steady (or seems to
me to be ok ) but when you apply a rudder input the helicopter jerks round
about 6 inches if you look at the tail then steadies up again its not a
constant problem as most times I can slowly rotate around but due to my
flying not a full 360 as yet, could it be a gain problem or something else,
its controlling a futaba S9450 servo the helicopter is a Nexus 30 which I
brought second hand, I have found a few faults on it since I have had it
i.e. fore aft cyclic servo arm was upside down so the links were not at 90
degrees and the washer that holds the tail blade ball race on was to big and
stopping the tail blade pivoting I am thinking of striping it down to see
what else is wrong but then I have the problem of trimming it out again ,
but my trips to the flying field seem to be different to the other
helicopter pilots so I am a bit on my own at present
and yes I do switch on the transmitter then the helicopter then wait for the
gyro to steady its self before moving it to start it
Kevin

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Beav - 22 Aug 2004 23:25 GMT

> I have a Csm HLG-200 gyro and I am defiantly not expert in helicopters I can
> hover a tank full of fuel and that's my limit, the problem I have is when
> you don't apply any input on the rudder the tail is rock steady (or seems to
> me to be ok ) but when you apply a rudder input the helicopter jerks round
> about 6 inches if you look at the tail then steadies up again

Kev, make sure the control rod, bell crank, pitch change ball/links and the
blade holders themselves ALL move with no friction. If there's ANY friction,
the gyro and tail rotor servo will have a harder time than necessary either
tarting a yaw or stopping one.

its not a

> constant problem as most times I can slowly rotate around but due to my
> flying not a full 360 as yet, could it be a gain problem or something else,

A gain problem would show up as the tail wagging like a happy dog (too much)
or not holding very well at all (too little)

> its controlling a futaba S9450 servo the helicopter is a Nexus 30 which I
> brought second hand, I have found a few faults on it since I have had it
> i.e. fore aft cyclic servo arm was upside down so the links were not at 90
> degrees and the washer that holds the tail blade ball race on was to big and
> stopping the tail blade pivoting

All the more reason to check the freedom of movement of all things tail
rotor.

I am thinking of striping it down to see

> what else is wrong but then I have the problem of trimming it out again ,

If you don't change the length of any of the links, no major trim changes
should happen, so think on, measure things if you intend pulling links off
rods to replace them.

> but my trips to the flying field seem to be different to the other
> helicopter pilots so I am a bit on my own at present
> and yes I do switch on the transmitter then the helicopter then wait for the
> gyro to steady its self before moving it to start it

That's good.

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Beav

Please note my E-mail address is "beavis dot original at ntlworld dot com"
(with the obvious changes)

Beavisland now lives at
www.beavisoriginal.co.uk

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Model Forum / Radio Controlled / Helicopters / August 2004

Csm HLG-200 gyro question