"Peter Christy" <christy@[EMAIL PROTECTED]
> wrote in message
news:EWWsj.347$yv1.150@[EMAIL PROTECTED]
> stearman wrote:
>
>> I have recently purchased my first helio (Raptor 50 Titan) and am
getting
>> ready to assemble. Also purchased Aerofly sim and the "Basics of RC
>> Helicopters" book.
>> I have read thru most of the book but cannot find any info on what the
>> flybars purpose is. Has anyone got a link to a narrative on the web for
>> Flybars ?
>>
>> Stearman
>
> The flybar acts as a "damper" on the rotorblades, and reduces the rate
of
> response to something that human reactions can cope with.
>
> Without some kind of "rate reducer", the response rate of the rotor disc
> is
> so fast that it would have re-acted to your control inputs and crashed
> before you even realised what had happened!
>
> By mechanically linking the rotor disk to the flybar, the whole assembly
> can
> only move at the rate of the slowest reacting component - in this case
the
> flybar (be it Bell, Hiller or a combination of the two).
>
> It is often referred to as a gyroscopic stabiliser, but this isn't
> strictly
> correct. A system doesn't have to be stable to be flyable, provided it
> only
> diverges slowly enough for a human pilot to react.
>
> The gyro on the tail rotor performs a similar function.
>
> --
> Pete
What Pete says is essentially true and for most of us, that's how the
helicopter is configured. The flybar is acting as a "stabilizer" and is
actually reducing the control inputs that we're putting to the main rotor
system. However, putting large, "light" paddles on the flybar and
changing
the Bell/Hiller mix ratios involved and you can have lightning quick
cyclic
responses. Many hard core 3D pilots use this kind of setup. It's not
faster than human capabilities to control, but does take a fair amount of
concentration to keep up with until you get used to it. "Finesse" is the
key work here! :-)
Also, there are a number of flybarless heads available out there that fly
just fine although they're not generally as stable as a flybar equipped
system but certainly not a total handful to fly either. My first
helicopter
was a flybarless machine called a Horizon. I learned to hover on it
without
any significant issues with cyclic authority and that was, as I found out
later, even with my cyclic throws set a couple of degrees higher than
recommended for beginners because I didn't understand what the directions
were asking me to do on the setup parameters.
FWIW!
Fly Safe,
Steve R.
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