page 60
July 01/2008
Effectivity: 914 Series
Edition 2 / Rev. 0
d04277
INSTALLATION MANUAL
BRP-Rotax
12.11.1)General directives for ducting of the cooling air
See Fig. 32.
For front installation in a closed cowling, ducting of cooling air to the cylinders
is recommended. In this case a costly horizontal partitioning can be avoided.
◆ NOTE: The engine remains in this case completely on the warm
side of the engine compartment and is very well accessible.
In special cases a separate cold air supply to the air intake
filters has to be provided.
BRP-Rotax has developed especially for this application a non-certified
cooling air ducting.
to be conducted by the aircraft manufacturer.
The following recommendations should assist the aircraft manufac-
turer at the planning of a suitable cooling air ducting.
- The cooling air ducting to be adequate to transfer thermal energy of
approx. 6 kW (5,7 BTU/s) at take-off power.
- required cross section of air duct: at least 100 cm
2
(16 in
2
)
- material:
glass fibre reinforced plastic or heat resistant non-inflammable mate-
rial.
- attachment:
formlocking on engine case and above of cylinders and crankcase
◆ NOTE: In case formlocking attachment won`t be adequate, addi-
tional attachment is possible on two tapped lugs M8 on top
side of engine.
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