Next message: (no name): "Re: lv-ab: Re: AC Reefer Update"
In a message dated 8/7/99 3:02:30 PM Eastern Daylight Time,
writes:
<< The tremendous mechanical advantage means that you can place huge amounts
of strain on the rudder that will cause accelerated wear to the rudder and
associated mounting hardware. A well found boat can usually be trimmed so
that the forces required to steer are not overwhelming. >>
One can properly trim and balance a hydraulically steered in exactly the same
manner as in a boat steered by any other linkage and then have the advantages
of hydraulic steering without the disadvantage you mention. This particular
disadvantage is in the sailor, not the steering linkage.
Hydraulic steering has no more or less mechanical advantage than any other
system. If you ignore losses due to friction, turbulence, bending of wires,
etc., all systems will have the same mechanical advantage, whatever they are
designed for. It is all in the relationship between diameter of wheel,
tiller length, and any gear ratio or leverage in between them. The ratio
between number of turns hard-over to hard-over as compared to force on the
rudder stock is fixed by the design. A bigger ship which requires more force
on the rudder simply has more turns on the wheel and/or a larger wheel. It
is just like (electricity-hydraulics-leverage); (voltage-pressure-turns)
times (ampres-flow-torque) equals the power involved (watts-(what's hydraulic
watts?)-Norwegian Steam).
Norm
S/V Bandersnatch
Anchored Norfolk VA
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