Resolution

[Tom Simes]

On Wed, 6 Oct 2004 15:08:03 -0500
"Wayne Galligan" <wgalligan at goodsonacura.com> wrote:

> A good question at this point would be.
> 
> How much does the percentage of throw or ATV have an effect on total
> power output of the servo?
> 
> Like IF I use 75% ATV to achieve the throw I need.  How much effect
> does that have on the total power output of my servo?
> 
> Wayne G.

Correct me - gently ;-) if I'm wrong, but I believe this simplifies to a
lever problem and using 75% ATV increases the force required of the
servo by 33%.

Work = Force x Distance

Moving a control surface through a distance requires a certain amount of
work.  The control surface could care less whether that amount of
work is the product of a large force and a small distance or a small
force and a large distance.  However, obviously your servo and battery
pack care and would prefer to exert a smaller force over a larger
distance.

Back to the equation, if we presume linkage losses to be a (hopefully
small) constant, then the work done on the surface equals the work done
by the servo.  If work is constant and distance is multiplied by 0.75
(75% ATV), then force must be multiplied by 1/.75 (133%) to preserve the
equality of the equation.

-- 
Tom

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