Introduction to Airplane Engines Flashcards
How does a reciprocating engine work (big picture)?
It converts the back and forth motion of the pistons to the rotary motion of the crankshaft
What are the basic parts of the engine?
Cylinder, piston, exhaust valve, intake valve, connecting rod, crankshaft, crankcase, spark plugs
What is the cycle of a four stroke engine
(1) Intake stroke (2) Compression stroke (3) Power stroke (4) Exhaust stroke
How many revolutions of the crankshaft does it take for a cylinder to complete it’s cycle?
2
What are three ways that heat from the combustion process is reduced?
(1) Exhaust (2) Oil cooling (3) Air cooling
What is the purpose of baffles?
To guide airflow to the heat critical parts of an engine
How to cooling fins increase the effectiveness of airflow?
Airflow enters the front of the engine compartment, passes over the baffled fins, and exits through the rear of the engine cowling
What are the three functions of engine oil?
(1) Lubrication (2) Heat dissipation (3) Cleans foreign materials through oil filter
What are the two types of oil used in airplane reciprocating engines?
(1) Mineral Oil (2) Ashless Dispersant Oil
What function does ashless dispersant oil have?
Contains an additive that keeps contaminants and dirt in suspension in oil, allowing them to be drained with the oil
What is the function of the magnetos?
They provide the spark which ignites the fuel in the cylinders.
What are the five positions of the magneto switch?
Off, left, right, both, start
During engine runup, what needs to be done with the magnetos?
Both L and R magneto need to be checked to ensure proper operation
