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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 con centration 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. C a n v as c o nfi g ur a t i o ns – Un d er var i o us c o n d it i o n s,
adding or r emov ing canvas may raise or lower CO
l evels. See Fi gures B8, B9 & B11.
EXHAUST FUMES!
Hull exhaust from your boat can cause ex-
cessive 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 30
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