Flashcards on Reciprocating Aircraft Engine Principles
Reciprocating Aircraft Engine Principles: Comprehensive Guide
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Aircraft Reciprocating Engines
12 cards
Card 1
Question: How are conventional reciprocating engines classified?
Answer: In-line, V-type, radial, and opposed (horizontally opposed).
Card 2
Question: How are conventional reciprocating engines classified by cooling method?
Answer: Liquid-cooled or air-cooled.
Card 3
Question: What is the main advantage of a horizontally opposed engine over a radial engine for modern aircraft?
Answer: A much smaller frontal area, making it easier to streamline.
Card 4
Question: Why are valve clearances adjusted on radial engines but not on most horizontally opposed engines?
Answer: Radial engines have solid lifters requiring clearance adjustment; most horizontally opposed engines use hydraulic valve lifters that remove clearance
Card 5
Question: What is the purpose of hydraulic valve lifters in an aircraft engine?
Answer: They keep all the clearance out of the valve operating mechanism, decreasing wear of valve train components.
Card 6
Question: What types of piston rings are used in reciprocating aircraft engines?
Answer: Compression rings, oil control rings, and scraper rings.
Card 7
Question: What is the purpose of oil control rings?
Answer: To control the thickness of the oil film on the cylinder walls.
Card 8
Question: What can result from installing piston rings incorrectly?
Answer: Excessive oil consumption and blow-by.
Card 9
Question: What type of connecting-rod assembly is commonly used in radial engines?
Answer: A master and articulating (articulated) rod assembly.
Card 10
Question: At what speed does the camshaft turn relative to the crankshaft in a horizontally opposed engine?
Answer: The camshaft turns at one half of crankshaft speed.