Calidus
SYSTEM DESCRIPTION
AutoGyro_POH_Calidus Revision 4.0 – Issue Date 17.JAN.2019 7-6
This picture shows the principle of the oil system, as shown in the Rotax handbook. For this
aircraft a thermostat is included within the oil system, fitted between the engine and the
radiator.
Engine cooling
Engine cooling is provided by ram air cooled cylinders and liquid cooled cylinder heads.
Therefore, cylinder head temperature (CHT) or coolant temperature (CT) indication
(depends on cylinder head design) is provided in the cockpit. Sufficient cooling air flow is
provided by a ram air duct. The water cooling system comprises of engine driven pump,
radiator with thermo-activated electrical blower fan, expansion tank with radiator cap,
overflow bottle, and hoses.
A single, large area radiator is mounted above the engine so that cooling air from the ram
air duct passes through the cooler, is directed around the engine’s cylinders, and finally
escapes through an opening at the lower rear end of the engine cowling. Force cooling is
ensured by an electrically driven ducted fan controlled by a thermo switch. A push button in
the cockpit allows manual activation temporarily which is typically used to avoid possible
heat build-up after shut-down.
Two versions of engine cowling are fitted. The later type has improved ducting for better
cooling.
In order to support natural heat circulation (chimney effect) with the early cowlings fitted, the
blower fan reverses in ground mode to allow the hot air escape at the ram air opening in the
forward mast cover. Ground mode is detected when the engine is off. This is an optional
fitment.
The cooling system is thermostatically controlled, such that coolant only passes through the
radiator when the coolant temp reaches the required value. The coolant circuit also supplies
the interior mounted heater system. This coolant bypasses the thermostat such that heat
reaches the cabin before the coolant temperature activates the thermostat.
For the relevant checking and replenishing procedures, refer to SECTION 8 of this manual
and also the engine manufacturer’s manual.
7.7 Propeller
To Next Page
Loading...