Volvo Penta KAD32 Instruction Book page 7

Carbon monoxide poisoning
When a boat is moving forward backwash is caused
behind the boat. Sometimes this backwash can be so
powerful that exhaust gases can be sucked into the
cabin or seating well on the boat with the resulting risk
of carbon monoxide poisoning for those on board.
The backwash problem is greatest with high, broad
boats with a squared stern. But other types of boat
can also have backwash problems under certain
conditions, for example when running with an awning
rigged. Among other factors that can increase the
backwash effect are wind conditions, load distribution,
the sea running, trim, open hatches and valves.
Checklist
Safety equipment Life jackets for all passengers, communication equipment, emergency rockets,
approved fire extinguisher, first-aid equipment, life belt, anchor, paddle, torch etc.
Replacement parts and tools: impeller, fuel filters, fuses, tape, hose clamps, engine oil, propeller
and tools for any repairs that might have to be carried out.
Get out your charts and go over the planned route. Calculate distance and fuel consumption.
Listen to the weather reports
Make sure that relations or contact persons are informed when planning a longer voyage.
Remember to inform them if your plans have changed or been delayed.
Tell your passengers and crew where the safety equipment is stored and how to operate it.
Make sure you are not the only person on board who knows how to start the boat and operate it
safely.
This list can be added to because safety equipment and other requirements vary depending on the
type of boat and how it is used. We recommend that you contact your local boating organization for
more detailed information on safety afloat.
Most modern boats are designed in such a way that
problems with backwash are extremely unusual.
Should a backwash problem occur do not open
hatches or valves in the forward part of the boat. This
will only increase backwash. Try changing speed, trim
or load distribution in the boat instead. In addition take
down, open or change the rigging of the awning in
some other way if an awning is rigged. Contact the
dealer where the boat was purchased to get more
information on how to solve this problem should it
occur on your boat.
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