Control.listing; Induce.planing.&.Controlling.trim.angle - Four winns FUNSHIP Owner's Manual

Before.leaving.the.dock.and.utilizing.the.trim.tabs,..
ensure.the.trim.tabs.are.in.the.full.up.position..Press.
both.lower.halves.of.the.trim.tab.switches.and.hold..
(for.approximately.10.seconds).until.the.tabs.are.full.up.
A. Control Listing
Wind,.loading.and.many.other.factors.can.result.in.the.
boat.tilting.or.leaning.towards.one.side.while.running...
This.is.called.listing.and.can.be.negated.using.trim.
tabs..
Pressing.the.lower.port.trim.tab.switch.will.move.the.
starboard.trim.tab.upward...This.will.result.in.the.port.
bow.of.the.boat.being.allowed.to.rise..
.
Pressing.the.lower.starboard.trim.tab.switch.will.cause.
the.port.trim.tab.to.move.upward.and.will.result.in.the.
starboard.bow.being.allowed.to.rise.
Pressing.the.upper.port.trim.tab.switch.will.cause.the.
starboard.trim.tab.to.move.downward.and.will.force..
the.port.bow.downward.
Pressing.the.upper.starboard.trim.tab.switch.will.cause.
the.port.trim.tab.to.move.downward.and.will.force.the.
starboard.bow.downward..
Always.establish.your.intended.heading.and.attain.
desired.cruising.speed.before.trying.to.adjust.running.
attitude.(using.the.trim.tabs).
Always press the trim tab switches in short one
() second bursts. If pressed too long, you can
overcompensate, and potentially lose control.
DO NOT try to correct the situation by pressing
the other upper trim tab switch. Instead, raise
the tab slightly by pressing the appropriate
lower half of the trim tab switch.
After.stabilization.of.speed.and.direction,.press.the..
upper.half.of.the.appropriate.trim.tab.switch.to.achieve.
a.level.side.to.side.running.attitude..Be.sure.to.press.
the.correct.trim.tab.switch.to.obtain.the.desired.result.
After.pressing.a.trim.tab.switch,.always.wait.and.allow.
time.for.the.change.in.trim.tab.position.to.take.effect...
DO.NOT.continue.to.press.the.trim.tab.switch.while.
awaiting.trim.tab.reaction..By.the.time.the.effect.is.
noted,.the.trim.tab.will.move.too.far.and.thus.overcom-
pensate.
Engines and Instrumentation - Section E
B. Induce Planing & Controlling Trim Angle
Trim.tabs.can.also.be.used.to.facilitate.faster.planing.
and.allow.better.control.of.the.running.angle.
Before.accelerating.and.trying.to.gain.plane,.press.
both.upper.trim.tab.switches..This.will.cause.both.
trim.tabs.to.move.downward.and.force.the.bow.down.
when.running..This.can.also.be.used.when.running.
the.boat.with.a.heavy.load.aboard.
Moving.the.trim.tabs.downward.will.increase.the.lift.
and.the.boat.will.achieve.plane.faster,.or.stay.on.
plane.at.a.lower.engine.and.boat.speed.
After.gaining.plane.and.establishing.cruising.speed,.
pressing.both.lower.trim.tab.switches.will.cause.both.
trim.tabs.to.move.upward.and.will.allow.the.bow.
to.rise..This.should.be.used.to.adjust.the.running.
attitude.of.the.boat.to.decrease.the.drag.at.cruising.
speed.or.above,.or.when.running.in.a.following.sea.
When.running.at.an.engine.speed.that.results.in.the.
boat.falling.off.plane.or.causes.the.boat.to.plane.
inefficiently, lowering both tabs slightly (bow down)
will.improve.the.running.angle.and.improve.operating.
efficiency.
Optimum efficiency is obtained when operating at a
3.to.5.degree.running.angle..Utilizing.too.much."Bow.
Down" trim tab can reduce operating efficiency and
cause substantial steering and handling difficulties.
Be.extremely.careful.when.running.in.a.following.sea.. .
The effect of trim tabs is amplified under such condi-
tions. Steering and handling difficulties can result
from.improper.trim.tab.usage,.especially.in.a.follow-
ing.sea..If.unsure.of.proper.trim.tab.positioning,..
raise.the.trim.tabs.to.the.full-up.position.
When running at high engine speeds, be sure
the trim tabs are in the full up position. Trim tab
action should be only enough to compensate
for any listing. Trim tab adjustments at high
speeds are extremely critical. Be prepared to
slow down should handling difficulties arise.
When.running.in.a.displacement.(very.slow.speed).
mode, better efficiency will be obtained with the trim
tabs.in.the.full-up.position.
Owner's Manual Page