That's for aerodynamic reasons, in the early days the pivot was moved
about a bit to avoid "short period oscillation" and the present position
was perhaps the best compromise. The pivot needs to be in front of the
centre of pressure, which can move about a bit. Symetrical sections tend
not to have moving Cp but maybe it does move a bit.
Graham
Richard Iddon wrote:
>
> At the expense of showing my ignorance, why is the tailplane balanced as
> it is? i.e. with the pivot point well forward of the c of g which
> necessitates a balancing weight. Could it not have been designed with
> the pivot point at the position of the c of g so no weight would be
> needed?
>
> Richard Iddon G-RIXS
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