Pilot Operating Handbook
Cavalon
SECTION 7
SYSTEM DESCRIPTION
AutoGyro_POH_Cavalon 915iS
Revision 1.0 – Issue Date 08.MAY.2019
7-4
7.6
Power Plant
Engine
The 915iS engine is a 4 cylinder, horizontally opposed, 4 stroke engine featuring
Liquid cooled cylinder heads
Ram air cooled cylinders
Dry sump forced lubrication
Dual breakerless capacitor discharge ignition
Fuel injection
Hydraulic tappets
Electric starter
Two Generators (Alternator)
Reduction gearbox with integrated shock absorber and overload clutch
For technical details refer to the engine manufacturer’s manual.
Oil system
The oil reservoir with dipstick is accessed through a cover on the right hand side of the
lower engine cowl. The cover is held by 3 cam lock fasteners which can be locked or
unlocked by a quarter turn. The type of lubrication system requires a special procedure for
accurate oil level checking and to prevent overfilling, which is described in SECTION 8 of
this manual.
Engine cooling
Engine cooling is provided by ram air cooled cylinders and liquid cooled cylinder heads.
Therefore, cylinder head coolant temperature (CT) indication 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.
The single, large area radiator is mounted under the suspension bow for effective cooling,
and the electric fan ensures good cooling when the aircraft is waiting for taxi or take-off. A
push button in the cockpit allows manual activation temporarily which is typically used to
avoid possible heat build-up when stationary.
Twin oil coolers are mounted above the engine, so the air from the upper cowl side scoops
cools the oil and then the engine. Similarly the intercooler is mounted in the central air
intake, and this air then also cools the engine, escaping through an opening at the lower
rear end of the engine cowling.
For the relevant checking and replenishing procedures, refer to SECTION 8 of this manual
and also the engine manufacturer’s manual.
7.7
Propeller
A four-bladed, fixed pitch propeller with aluminium hub is used as standard version. The
propeller blades are made from CRP composite material with a foam core. As an option a
variable pitch propeller is available which is described in SECTION 9 of this manual.
