SYSTEM DESCRIPTION
AutoGyro_FOM_MTOsport Revision 5.0 – Issue Date 01.04.2011 7-4
7.6 Power Plant
Engine
There are two engine variants available, being the ROTAX 912 ULS normally aspirated
reciprocating engine and the ROTAX 914 UL turbo charged version. Both engine types are
4 cylinder, horizontally opposed, 4 stroke engines featuring
Liquid cooled cylinder heads
Ram air cooled cylinders
Dry sump forced lubrication
Dual breakerless capacitor discharge ignition
2 constant depression carburettors
Hydraulic tappets
Electric starter
Generator (Alternator)
Reduction gearbox with integrated shock absorber and overload clutch
The ROTAX 912 ULS engine provides a maximum take-off power of 100 horse power while
the turbo charged version offers a maximum take-off power of 115 horse power. For
technical details refer to the engine manufacturer’s manual.
Oil system
The oil reservoir with dipstick is behind the aft seat on the right hand side. Access to the
reservoir is provided by unlatching the aft seat and folding it forward. 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 temperature (CHT) indication in the cockpit corresponds to water
temperature. The water cooling system comprises engine driven pump, radiator(s),
expansion tank with radiator cap, overflow bottle, and hoses.
The radiator is mounted at the lower aft end of the engine, just before the propeller. As an
option a second radiator can be installed. In this case both radiators are installed left and
right hand below the engine’s main attachment behind air scoops.
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 three-bladed, fixed pitch propeller with aluminium hub is used as standard version. The
propeller blades are made from composite material with a foam core. As an option a
variable pitch propeller is available which is described in SECTION 9 of this manual.
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