Exhaust system
23
Air turbulence behind the boat – Exhaust boot
Principle scetch of an exhaust boot system
When a boat, especially a boat with a sheer, broad
transom and high superstructure, moves forward and
creates a backward current of air, an underpressure
forms in the boat and the exhaust fumes are drawn
towards it.
To minimise this problem, the flow of the propeller
can be utilised to release the exhaust fumes far from
the boat transom. The outlets of the boots are prefer-
ably positioned in line with the propeller shaft just
behind the propeller and rudder. This way the exhaust
emissions are carried into the currents of water aft of
the propeller. See
"Wagon-back effect" in chapter
Exhaust system, General.
This slipstream system can be profiled to meet the
requirements of individual boat builders.
Volvo Penta has considerable know-how in the ap-
plication of custom-made exhaust boots, and can
provide conceptual design drawings of a hydrody-
namically developed boot for local manufacturing in
GRP/FRP.
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