I see, I am sure there are more. I must admit I am more familiar with aircraft
that are a bit more modern then the models you mention. But I do know (I just
had a look) that an old PA28-200 has a seperate, parallel cylinder with a
handle in the middle console and a knob to fix it.
Using the master cylinder (or a seperate one) is not a very smart thing to do
as they are notoriously leaky. I guess that is why newer aircraft designs use a
seperate brake valve...
But I would say a 'double' property is appropriate and the characteristic
depends on the individual aircraft.
Cheers,
Eric
BTW Stefan: FAR/JAR/CS23 requires that the brakes are able to keep the (braked)
wheels from turning with engine at take-off power. It does not require to hold
the aircraft at its position (thus slipping is allowed).
> To: flightgear-devel@lists.sourceforge.net
> From: martin.sp...@mgras.net
> Date: Fri, 9 Mar 2012 12:46:25 +0000
> Subject: Re: [Flightgear-devel] Double Input Resolution?
>
> Eric van den Berg wrote:
>
> > Agreed, but the as you are saying, the brake is hydraulic and
> > therefore there will always be a valve that traps the hydraulic fluid
>
> No.
>
> At least the older C172's are having mechanically operated parking
> brake levers which apply force onto the same hydraulic master cylinders
> as the pedals do. The DR300's and maybe even the very early DR400's
> are using the same principle and, as far as I remember, that's quite
> similar on the C150's and PA28's (the DR300 doesn't have toe brakes at
> all ....).
> Thus all their parking brakes are featuring an analogue characteristic.
>
> The modern DR400's are having a parking brake valve according to your
> explanation and our old C175 has a mechanical ! arrestor on the
> hydraulic master cylinders.
>
> Did I forget one ? Maybe.
>
> Cheers,
> Martin.
> --
> Unix _IS_ user friendly - it's just selective about who its friends are !
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