(The Enlightenment) wrote:

Precision hydraulic use dither as well.

Ok...I take back what I said about pneumatic systems...I really
don't know much about them, having only some small experience
with them on a/c up to about 1977. I never did like them I'll
admit.

Your mention of 'dither' in hydraulic systems is true, the
propeller control hydraulics of several a/c that I'm familiar
with use it to make the system react quickly to changing
conditions. Thanks for the links, most informative.
--

-Gord.