How Lift Control Works
“Lift Control,” a key feature of Sperry
Marine’s innovative and patented fin ship roll stabilisation system, is made possible
by mounting displacement transducers within the fin shaft. The transducers produce
an electrical signal proportional to the lift force generated by the angle of
attack of the fin to local water stream direction. This lift signal is compared
with the instantaneous value of lift required for ship roll stabilisation. The difference
is used to drive each fin until it achieves the desired lift, thereby automatically
compensating for variations on the local water stream direction. The angle of
the fin will change as needed until the desired lift is being achieved even
though the local water stream direction is continuously changing.
“Lift Control” prevents the fin from being driven at times into the
Cavitation Zone and at other times from producing a shortfall in lift. The lift
forces required for stabilisation are more faithfully produced, giving an improved ship roll
stabilisation efficiency.
Lift Control Advantages
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Ship Roll Stabilisation systems using “Lift Control” produce the demanded
peak lifts when required without operating in the cavitation region.
Ship Roll Stabilisation systems without “Lift Control” cannot maintain
the required peak lifts because of the fluctuating conditions within
the cavitation region.
Sperry Marine’s “Lift Control” produces maximum fin efficiency
not available from any other ship roll stabilisation system.
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