Hélicoptères Guimbal
SECTION 7
CABRI G2
SYSTEMS DESCRIPTIONS
Approved under DOA EASA.21J.211
7-5
Engine installation
Engine
The engine is a four-cylinder, direct-drive, carbureted gasoline engine.
It is installed in the central compartment, suspended through elastomeric
vibration mounts.
It moves slightly to control the main transmission belt tension for clutch
engagement / disengagement.
Clutch
The clutch tension actuator is fed by engine oil pressure through a four-
way distributor, controlled by the CLUTCH switch.
This system is frozen in case the electrical power is shutdown.
A non-return valve maintains the pressure in case of engine stoppage,
or oil pressure loss.
A gas spring maintains the engine disengaged during prolonged stop.
The CLUTCH light lights OFF when the pressure of the oil feeding the
distributor is above 3.6 bar. In the clutched position, it means that the
belt is tensioned. In the declutched position, it means that the clutch
cylinder is on its declutched stop.
Air induction
The engine air intake is located inside the main gearbox compartment,
on the right side. It is fed in fresh air, by the front inlet above the cabin.
A wire screen prevents foreign object ingestion.
The air is ducted down the firewall, to an air filter box, behind the
carburetor.
This air box includes an electrically-actuated butterfly valve, which
controls the carburetor heating, and the air filter.
Both cold and hot air are filtered.
An air intake temperature probe, located inside the air filter, sends the
carburetor inlet temperature to the EPM.
Ignition system
The engine has a dual-plug, mixed ignition system comprising :
•
One magneto with constant timing,
•
One solid-state electronic capacitor-discharge system, with
variable timing.
The electronic system is direct-fed by the battery through a dedicated
circuit breaker, located on the cabin breaker panel.
