Thanks for all the help..now on to the next problem

[Chuck W]

For those that helped me out with the GY240 gyro issue, thanks. That seems
to be solved, and she's working like a champ now. Gonna try it out in AVCS
today to see what happens. I've had the heli in what you might call a
semi-controlled hover a few times. I can keep it level, but forget keeping
it in one spot just yet. I've got all the trims pretty close, I think. I
have two questions:

1. My elevator trim for the cyclic is closer to the top of the range than I
care to have it. I assume it's just a simple matter of shortening the front
linkage and lengthening the back on a bit on the swashplate to get the
'natural trim' so I can move my TX trim back to neutral, yes?

2. The heli has this little thing that isn't mentioned anywhere in any book
I've seen thus far. (This is a Nexus 30, BTW) As it comes up to speed, it
has a brief period of noticeable vibration before smoothing back out just
under hovering speed. I work around heavy machinery, including some
turbines, and in that line of work, such a thing is known as the 'resonance
speed' of the equipment. Is this a normal occurrence for an RC heli, or is
there another balancing gremlin I've yet to chase down?

-Chuck W

[Beav]

"Chuck W" <cwiley101@comcast.spamdeath.net> wrote in message
news:yoadnb7De6ApVqOjXTWc3A@comcast.com...
> For those that helped me out with the GY240 gyro issue, thanks. That
seems
> to be solved, and she's working like a champ now. Gonna try it out in
AVCS
> today to see what happens. I've had the heli in what you might call a
> semi-controlled hover a few times. I can keep it level, but forget
keeping
> it in one spot just yet. I've got all the trims pretty close, I think. I
> have two questions:
>
> 1. My elevator trim for the cyclic is closer to the top of the range than
I
> care to have it. I assume it's just a simple matter of shortening the
front
> linkage and lengthening the back on a bit on the swashplate to get the
> 'natural trim' so I can move my TX trim back to neutral, yes?

Yes. You COULD use "sub-trim" too, but doing things mechanically is FAR
better.
>
> 2. The heli has this little thing that isn't mentioned anywhere in any
book
> I've seen thus far. (This is a Nexus 30, BTW) As it comes up to speed,
it
> has a brief period of noticeable vibration before smoothing back out just
> under hovering speed. I work around heavy machinery, including some
> turbines, and in that line of work, such a thing is known as the
'resonance
> speed' of the equipment. Is this a normal occurrence for an RC heli, or
is
> there another balancing gremlin I've yet to chase down?

It's pretty normal (well it's not unusual) and if the heli passes through
this stage and runs smoothly, then it's not a blance thing. It could be your
blades are a bit tight in the holders, but better too tight than too slack,
coz if they're too slack, they can swing back too easily and this can easily
result in an unnanounced boom strike.


--
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

[Chuck W]

"Beav" <beavis.original@ntloxoworld.com> wrote in message
news:DMA%9.12002$RZ.134892@newsfep4-win.server.ntli.net...
>
> "Chuck W" <cwiley101@comcast.spamdeath.net> wrote in message
> news:yoadnb7De6ApVqOjXTWc3A@comcast.com...
> > For those that helped me out with the GY240 gyro issue, thanks. That
> seems
> > to be solved, and she's working like a champ now. Gonna try it out in
> AVCS
> > today to see what happens. I've had the heli in what you might call a
> > semi-controlled hover a few times. I can keep it level, but forget
> keeping
> > it in one spot just yet. I've got all the trims pretty close, I think.
I
> > have two questions:
> >
> > 1. My elevator trim for the cyclic is closer to the top of the range
than
> I
> > care to have it. I assume it's just a simple matter of shortening the
> front
> > linkage and lengthening the back on a bit on the swashplate to get the
> > 'natural trim' so I can move my TX trim back to neutral, yes?
>
> Yes. You COULD use "sub-trim" too, but doing things mechanically is FAR
> better.
> >
> > 2. The heli has this little thing that isn't mentioned anywhere in any
> book
> > I've seen thus far. (This is a Nexus 30, BTW) As it comes up to speed,
> it
> > has a brief period of noticeable vibration before smoothing back out
just
> > under hovering speed. I work around heavy machinery, including some
> > turbines, and in that line of work, such a thing is known as the
> 'resonance
> > speed' of the equipment. Is this a normal occurrence for an RC heli, or
> is
> > there another balancing gremlin I've yet to chase down?
>
> It's pretty normal (well it's not unusual) and if the heli passes through
> this stage and runs smoothly, then it's not a blance thing. It could be
your
> blades are a bit tight in the holders, but better too tight than too
slack,
> coz if they're too slack, they can swing back too easily and this can
easily
> result in an unnanounced boom strike.
>
>
> --
> 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
>
>

Thanks. Good to know things are on track.

-Chuck W