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KAVITHA.G
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The ignition system provides a spark toignite the air/fuel
mixture in thecylinders of a piston engine.
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Magneto systems
Switchable systems
Battery-operated ignition
Mechanically timed ignition Electronic ignition
Digital electronic ignitions
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PETROL ENGINES uses an ELECTRIC SPARK forIGNITION.
DIESEL ENGINES rely on FUEL COMPRESSIONfor ignition.
GAS TURBINES uses MAGENTO TYPE ignitionsystems, also have a
CAPACITOR DISCHARGEIGNITION SYSTEM using one or more ignitorplugs,
which are only used at start up.
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ROCKET ENGINES employ PYROTECHNICDEVICES that place flames
across the face of theinjector plate or SELF-IGNITION
CHEMICALS.
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Most modern aircraft engines use magnetos to generatethe spark,
magnetos are useful in aircraft because:
They produce a hotter spark at high engine speeds thanthe
battery system used in automobiles.
They do not depend on an external source of energysuch as a
battery, a generator, or an alternator.
Self reliable,less weight.
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WORKING:
The magneto type ignition system is used on mostreciprocating
aircraft engines.
Magnetos are engine driven self-contained units
supplyingelectrical current without using an external source of
current. However, before they can produce current the magnetos
must
be actuated as the engine crankshaft is rotated by some
othermeans.
To accomplish this, the aircraft battery furnishes
electricalpower to operate a starter, which through a series of
gears,rotates the engine crankshaft. This in turn actuates
thearmature of the magneto to produce the sparks for ignition ofthe
fuel in each cylinder.
After the engine starts, the starter system is disengaged,
and
the battery no longer contributes to the actual operation of
theengine.
.
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Most aircraft engines are equipped with a dual ignitionsystemtwo
magnetos that supply electrical current totwo spark plugs for each
cylinder. One magneto system
supplies the current to one set of plugs; the secondsystem
supplies the current to the other set of plugs.This is why the
ignition switch has five positions: OFF, L(LEFT), R (RIGHT), BOTH,
and START. With the switch
in the L or R position, only one magneto supplies currentand
only one set of spark plugs fires. With the switch inthe BOTH
position, both magnetos supply current andboth sets of spark plugs
fire.
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Increased safety and efficiency.
If one magneto system fails, the engine can operate onthe other
system until you can make a safe landing.
Two spark plugs improve burning and combustion ofthe mixture,
delivering improved performance.
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LASAR which stands for Limited Authority Spark AdvanceRegulator,
is the first microprocessor based engine controlsystem approved by
the FAA for general aviation pistonaircraft.
With the system operating in its automatic mode, cylinderhead
temperature, manifold pressure, and engine speed(RPM) are monitored
by the LASAR controller to establishand command the optimum
ignition timing and sparkenergy to produce maximum torque from the
engine.
LASAR has an inherent mechanical magneto backupsystem that
automatically assumes control if electricalpower is interrupted or
if the microprocessor detects asystem fault.
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Installation requires replacement of standardmagnetos with Lasar
magnetos, a LASAR ControlBox, which is mounted to the firewall, a
low-
voltage control harness that carries the electronicsignals
between the system components
http://www.aircraftspruce.com/catalog/graphics/08-06224.jpg
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Boeing and Airbus are the biggest Aero plane
manufacturing companies in the world
AIRBUS BEOINGCOMPANY EUROPEAN BASED
COMPANY
US BASED COMPANY
SPECIALIST ADVANCEDTECHNOLOGY
BETTERUNDERSTANDING OFTHE WORLDWIDEMARKET
CONTROL SYSTEM FLY BY WIRE FLY BY WIRE
ENGINE TURBO FANEG:ROLLS ROYCE
TURBO FANEG:ROLLS ROYCE
CONTROL COLUMN SIDE STICKS YOKES
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AIRBUS BEOING
ACHIEVEMENTS LARGEST AIRPLANEFOR PASSENGERS
SECOND LARGESTAIRPLANE
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