Airplane Factory SLING 4
Pilot Operating Handbook
Page | 7-25
DC-POH-001-X-C-3
Revision : 1.3
7.15
Engine
The Rotax 914 UL engine is a 4-stroke, 4-cylinder, horizontally opposed,
turbocharged spark ignition engine with one central camshaft-push-rod-
OHV. The engine features liquid cooled cylinder heads with air cooled
cylinders. It utilizes dry sump forced lubrication and has a dual contactless
capacitor discharge ignition system. The engine is fitted with an electric
starter, AC generator (alternator) and two electrical fuel pumps (for
redundancy). Propeller drive is via reduction gear with integrated shock
absorber.
7.16
Cooling system
Cylinders are air cooled.
Cylinder heads are liquid cooled via a closed circuit system with an
expansion tank. A camshaft driven coolant pump circulates coolant from a
radiator through the cylinder heads, then an expansion bottle and back to
the radiator.
The expansion tank is closed by a pressure cap.
At temperature rise of the coolant an excess pressure valve in the
expansion tank opens and coolant flows (via a hose) at atmospheric
pressure to an overflow bottle mounted on the firewall. When cooling
down the coolant in the overflow bottle is sucked back into the cooling
circuit.
Refer to the latest revision / edition of the Rotax 914 UL engine operator
and maintenance manuals.
Summary of Contents for SLING 4
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