B. Stern Drive
This.is.due.to.the.greater.amount.of.propeller.blade.
surface.in.contact.with.the.water..See.Figure.E-2.
A.stern.drive.or.inboard/outboard.propulsion.system.
has.a.piston.engine.equipped.with.special.marine.
components.mounted.near.the.transom.and.coupled.
to.an.external.outdrive-type.transmission.unit..Shifting.
is.performed.within.the.outdrive.upper.gear.case...
This.type.of.system.is.depicted.in.Figure.E-1.
Figure E-2: Propeller Pitch & Diameter
B. Pitch
Pitch.is.a.measure.of.helix.angle,.or.angle.of.attack,..
of.the.rotating.blade..Pitch.is.easily.understood.if.one.
imagines.the.propeller.rotating.through.a.semisolid.
such.as.butter.or.gelatin..The.distance.the.propeller.
will travel in one revolution is called “Pitch.” Increasing
or.decreasing.pitch.will.also.have.a.direct.bearing.on.
engine.RPM’s.because.of.the.greater.bite.taken.by.
the.blade.with.each.rotation..See.Figure.E-2.
Figure E-1: Stern Drive
NOTICE
Always return the engine throttle lever to the
extreme low speed position before shifting.
NEVER shift the unit while engine speed is
above 00 rpm.
C. Prop Slip
When.traveling.through.water.a.propeller.is.unable..
to get a complete bite because of the fluidity of water.
“Prop slip” is usually expressed as a percent of the
computed theoretical speed. Twenty-five to thirty-five
percent.prop.slip.is.common.for.a.cruiser-type.boat.
operating.at.cruising.speed.
E - 4
PROPELLERS
Knowledge.of.the.propeller.is.most.easily.gained.
through.better.understanding.of.the.terminology..
used.to.refer.to.the.aspects.of.propeller.size.and.
performance..It.should.be.noted.that.on.most.318.
Changing.either.diameter.or.pitch.will.have.an.effect.
on.engine.speed.and.prop.slip,.and.in.turn,.directly.
effect.the.performance.of.a.boat..The.propellers.
Vista .models.include.stainless.steel.propellers.
®
A. Diameter
included.with.each.Four.Winns .boat.provide.the.best.
®
general.performance.based.on.data.obtained.from.
on-the-water.testing.of.that.model..Variations.in.load,.
operating.conditions,.environment,.the.individual.
engine.and.hull.performance.may.necessitate.the.
purchase.and.use.of.another.propeller(s).
Diameter.is.twice.the.distance.from.the.center.of..
the.prop.shaft.to.the.extreme.tip.of.a.propeller.blade..
Increasing.or.decreasing.propeller.size.will.have.a.
direct.bearing.on.the.RPM’s.an.engine.will.develop..
Engines, Drives and Instrumentation - Section E
Owner’s Manual Page
| Categories | Four Winns Manuals, Four Winns Vista Manuals, Outboard Marine Corporation Manuals |
|---|---|
| Tags | Four Winns Vista 318 |
| Model Year | 2006, 2007, 2008 |
| Download File |
|
| Document Type | Owner's Manual |
| Language | English |
| Product Brand | Boats and Cruisers, Four Winns. For support contact your dealer at http://www.fourwinns.com/locate-dealer.aspx |
| Document File Type | |
| Publisher | fourwinns.com |
| Wikipedia's Page | Outboard Marine Corporation |
| Copyright | Attribution Non-commercial |
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