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Jabiru Aircraft
Pty Ltd
Installation Manual
Jabiru 3300 Aircraft Engine
REVISION
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Dated : 1
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Dec 2016
Page: 44 of 56
Figure 47. Cowl Airflow (Best Viewed in Colour)
Figure 48. Cowl Airflow (Black & White Version)
Air entering cowl
through oil cooler
High pressure air entering
cowl through ram air ducts
Air from ram air ducts
and oil cooler mixing
High temperature air
under cylinder heads
Cowl outlet sucks air out of
the cowls. Low pressure,
warm air flows out.
Balanced Flow
Un-Balanced Flow
Un-Balanced Flow
Air leaking past oil cooler
reduces air flow rate
through cylinder heads
Air leaking past
cylinder heads
reduces air flow rate
through oil cooler
Air entering cowl
through oil cooler
High pressure air entering
cowl through ram air ducts
Air from ram air ducts
and oil cooler mixing
High temperature air
under cylinder heads
Cowl outlet sucks air out of
the cowls. Low pressure,
warm air flows out.
Balanced Flow
Un-Balanced Flow
Un-Balanced Flow
Air leaking past oil cooler
reduces air flow rate
through cylinder heads
Air leaking past
cylinder heads
reduces air flow rate
through oil cooler