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J. The Effect of Boats Moored Along Side
A.boat.operator.should.be.aware.that.carbon.monox-
ide.is.emitted.from.any.boat's.exhaust..The.operation,.
mooring,.and.anchoring.in.an.area.containing.other.
boats.may.be.in.an.atmosphere.containing.CO.not.of.
the.operator's.making..An.operator.likewise.needs.to.
be.aware.of.the.effect.of.their.boat.on.other.boats.in.
the.area..Of.prime.concern.is.the.operation.of.an..
auxiliary.generator.where.boats.are.moored.along.
side.each.other..Be.aware.of.the.effect.your.exhaust.
may.have.on.other.boats.and.be.aware.that.the.
operation.of.other.boats'.equipment.may.affect.the.
carbon.monoxide.concentration.on.your.boat...
See.Figure.B7.
Figure B7: The effect of boats moored along side
K. Backdrafting (Station Wagon Effect)
Backdrafting or the "station wagon effect" is caused .
by.air.movement.over.or.around.a.boat.creating.a.low.
pressure.area.or.suction.area.around.the.stern.that.
can.increase.CO.level.on.the.boat..Backdrafting.can.
be.affected.by.relative.wind.direction,.boat.speed,..
and boat trim angle. See Figure B8 Backdrafting – .
Airflows Over Boat and Behind Transom".
Figure B8: Backdrafting - Air flows over boat
and behind transom
Under.certain.speed.and.operating.conditions,.the.low.
pressure.area.may.form.in.other.regions.and.permit.
carbon.monoxide.to.enter.the.hull.through.openings.
that.are.not.on.the.back.of.the.boat..Boat.factors.
which.may.affect.CO.concentration:
1.. Intentional.or.unintentional.excessive.trim.angle.
causing.high.bow.angle..See.Figure.B9.
Boating Safety - Section B
2.. Excessive.or.unequally.distributed.weight.
Figure B9: Inefficient trim angles
3. Canvas configurations – Under various conditio-
ns,.adding.or.removing.canvas.may.raise.or.lower.
CO.levels..See.Figures.B8,.B9.&.B11.
EXHAUST FUMES!
Hull exhaust from your boat can cause
excessive accumulation of poisonous carbon
monoxide gas within cockpit areas when using
protective weather coverings (while underway
or while stationary). Provide adequate ventila-
tion when the canvas top, side curtains and/or
back (aft) curtains are in their closed protective
positions.
4.. Opening.and.closing.ports,.hatches,.doors,.and.
windows.may.raise.or.lower.CO.levels.on.board..
a boat. When airflow is moving forward inside the
boat,.CO.may.be.entering.the.boat..See.Figures.
B10.and.B11.
Figure B10: Desired air flow through the boat
Figure B11: The effect of canvas configurations
5.. Operating.a.boat.at.slow.speeds.with.a.following.
wind.should.be.avoided..Consider.changing.direc-
tion,.adjusting.speed,.or.both..See.Figure..
B12.
Owner's Manual Page
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