Jon Stone wrote:
> ----- Original Message -----
> From: "John O'Sullivan" <[EMAIL PROTECTED]>
> > Slop factor is slop factor in servos and is independent of whether
> regular linkage or RDS is used, so it cannot be used as a
> > consideration in evaluating the usefulness of RDS.
>
> John,
>
> I respectfully disagree.
>
> There is a constant slop factor in the servo which results in some amount of
> free (angular movement).
> This angular movement is the same regardless of
> RDS or clevis hookups.
This is exactly what I stated, but I may have put it in an ambiguous way. I did not
mean to imply that servo slop did not affect
the RDS output, but that it was the same for both RDS and regular linkage and as such
should not be considered as an RDS only
problem.
We can argue back and forth till eternity on the academics of linkages, but the final
test is in how the system works in practice.
Fit the system to your model, test it and then you can see for yourself how well the
RDS works.
> However, consider this for a clevis mounted on a
> servo horn.
>
> If a servo has any slop at all, there will be more linear movement of the
> control surface if the clevis is attached to the outer most hole of the
> servo's horn, as opposed to the innermost hole of the servo's horn. Even
> though the angular slop of the servo is the same. Thus, it is possible to
> transfer less slop to the control surface by moving the clevis on the
> servo's horn.
>
>
> Of course, there is a tradeoff here. The closer the clevis is attached to
> the center of the servo horn, then you get more torque (at the surface), and
> more slop. If you move the clevis to the outermost hole, then the servo has
> to work harder, but there is less slop (due to servo gears) available at the
> control surface.
>
> If I am incorrect, then please correct me.
Correct.
Also consider the wear in the servo arm hole. There may be slop here which is
compounded on a short arm, where the play would be a
higher percentage of the travel distance.
>
>
> On the other hand, if there is any slop in the servo due solely to a loose
> output bearing, then the control surface using a clevis hookup would
> certainly see it. I'm not sure how this kind of slop in the servo would
> show up in an RDS installation.
>
Side to side play in the output bearing would not be of significance in RDS as it is
only the rotary movement that is carried to the
control surface
--
John O'Sullivan
Nova Scotia
Wind and Wave Models
http://www.windandwavemodels.com/
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