Exhaust system
76
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 to-
wards 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 preferably
positioned in line with the propeller shaft just behind
the propeller and rudder. This way the exhaust emis-
sions are carried into the currents of water aft of the
propeller. See
"Wagon-back effect"
page 68.
This slipstream system can be profiled to meet the re-
quirements of individual boat builders.
Volvo Penta has considerable know-how in the appli-
cation of custom-made exhaust boots, and can pro-
vide conceptual design drawings of a hydrodynamical-
ly developed boot for local manufacturing in GRP/
FRP.
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