General Directives For The Cooling System - Rotax 912 Series Installation Manual

12.9) General directives for the cooling system

See Fig. 29.
BRP-Rotax offers essential parts of the cooling system for this engine such as
radiator, etc..
▲ WARNING: Certification to the latest requirements to FAR or EASA has to
08320
Fig. 35
In an installation as depicted with the radiator (9) in a higher position than the
standard supplied expansion tank, a water accumulator (10) has to fitted instead
of the expansion tank. Additionally a suitable expansion tank (1) has to be
installed at the highest point of the cooling circuit.
■ CAUTION:
◆ NOTE:
Effectivity: 912 Series
Edition 1 / Rev. 0
BRP-Rotax
INSTALLATION MANUAL
be conducted by the aircraft manufacturer.
9
The size and type of radiator should be adequate to transfer
thermal energy of
approx. 25 kW (24 BTU/s) (for ROTAX 912 A/F/UL) or
approx. 28 kW (26,5 BTU/s) (for ROTAX 912 S/ULS)
at take-off power.
Assessment data by experience. For troublefree operation at
good airflow a radiator of at least 500 cm
be used.
The flow rate of coolant in the cooling system is approx. 60 l/
min (16 US gal/min) at 5800 rpm. As reference value for the
necessary cooling airflow approx. 0,75 m³/s at full load can be
assumed.
The flow resistance of the coolant in the optional ROTAX-
radiator is properly designed for the cooling system.
Check flow rate and cooling capacity if other radiators are
used.
1
1
10
2 2
(78 in ) area has to
May 01/2007
page 61