Magneto Functions in Aircraft Engines

The video explains the function and components of magnetos in piston engine airplanes. Magnetos are self-contained high voltage generators that provide electrical current to spark plugs, igniting the fuel-air mixture in the engine. The video details how magnetos generate current through a rotating magnet and copper wire coils, and how the breaker point and capacitor ensure a strong voltage spike for spark creation. It also covers the distributor's role in routing high voltage to spark plugs and discusses the reliability of magnetos, highlighting the use of dual magnetos for backup.

What is the primary purpose of a magneto in piston engine airplanes?

• To generate high voltage for the battery

• To provide electrical current to the spark plug

• To control the fuel-air mixture

• To cool down the engine

How is electrical current generated in a magneto?

• By moving a magnet through a coil of copper wire

• By compressing air in the cylinder

• By rotating the engine

• By heating the copper wire

What happens when the spark ignites the fuel-air mixture in the engine cylinder?

• The fuel evaporates

• The engine stops

• The piston moves down

• The piston moves up

What is the role of the breaker point in a magneto?

• To regulate the engine speed

• To stop the current in the primary coil

• To increase the voltage in the primary coil

• To connect the primary and secondary coils

Why is a capacitor used in a magneto?

• To prevent arcing at the breaker point

• To store electrical energy

• To cool the magneto

• To increase the engine's power

What is the function of the secondary coil in a magneto?

• To connect to the engine's battery

• To transform the voltage spike into a higher voltage

• To generate a low voltage for the spark plugs

• To regulate the current flow

How does the distributor ensure the correct firing order of spark plugs?

• By using a timing belt

• By connecting directly to the battery

• By routing high voltage current at half crankshaft speed

• By rotating at crankshaft speed

Why do airplanes have two magnetos?

• To reduce fuel consumption

• For backup and improved performance

• To decrease engine noise

• For increased engine speed

What might cause a magneto to fail over time?

• High altitude flying

• Low fuel levels

• Fractured plastic gears or a broken capacitor

• Excessive engine speed

What additional topics are suggested for further learning?

• The exhaust system

• The cooling system

• The fuel injection system

• The impulse coupling and the auto cycle