1. Aircraft Ignition system
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Aircraft Ignition system
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Ignition system
An ignition system is a system used for igniting a fuel-air mixture
The function of the ignition system is to provide an electrical spark to ignite the fuel/air mixture in the cylinders.
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The ignition system of the engine is completely separate from the airplane's electrical system.
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4. VARIOUS COMPONENTS OF IGNITION SYSTEM
IGNITION SWITCH
MAGNETO
DISTRIBUTOR
TRANSFORMER
SPARK PLUG
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5. BATTERY IGNITION SYSTEM:
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Few aircraft and most automobiles use a battery ignition system which has a battery or Generator rather than a magneto as its source of energy.
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In battery ignition system, a cam is driven by the engine opens a set of points to interrupt the flow of current in primary circuit
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The magnetic field induces a high voltage in the secondary of the ignition coil, which is directed by a distributor to the proper cylinder.
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MAGNETO IGNITION SYSTEM
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The magneto type ignition system is used on most reciprocating aircraft engines. Magnetos are engine driven self-contained units supplying electrical 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 other means.
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It is superior to battery ignition because produces a hotter spark at high engine speeds
It is self contained unit, not dependent on any external source of electrical energy
It produces a high voltage in spark plug gap in each cylinder
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13. CLASSIFICATIION OF MAGNETO IGNITION SYSTEM
It can be classified into two types Low tension magneto system High tension magneto system
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Modern airplane engines are required by to have a dual ignition system
Two separate magnetos to supply the electric current to the two spark plugs contained in each cylinder.
One magneto system supplies the current to one set of plugs; the second magneto system supplies the current to the other set of plugs. For that reason the ignition switch has four positions:
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OFF, L, R, and BOTH With the switch in the "L" or "R" position.
only one magneto is supplying current and only one set of spark plugs in each cylinder is firing.
With the switch in the BOTH position, both magnetos are supplying current and both spark plugs are firing.
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SPARK PLUG
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PURPOSE IS TO CONDUCT A SHORT IMPULSE OF HIGH VOLTAGE THROUGH THE WALL OF THE COMBUSTION CHAMBER
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MAIN COMPONENTS ARE
OUTER SHELL
INSULATOR
ELECTRODE
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