Engines Flashcards
1
Q
Radial Engines
A
- Circular in Shape
- Odd number (usually 9 max) of cylinders arranged around crank case
- Good cooling, good power, easy to maintain
- Poor forward visibility and excessive drag
2
Q
Inline Engines
A
- Cylinders arranged side by side in a row
- Usually a max of 6 for vibration
- Engine may be inverted for better visibility
- Greatest weight to horsepower ratio
- Less drag and better visibility
3
Q
Horizontally Opposed Engines
A
- Most common in small aircraft
- 2 rows of cylinders arranged horizontally
- Even number of cylinders
- Small frontal area
- Less drag
4
Q
Four Stroke Cycle
A
- Two Rotations of the crank shaft
- Intake
- Compression
- Ignition
- Exhaust
5
Q
Compression Ratio
A
- Volume of cylinder above piston at bottom of compression stroke compared to top of compression stroke
6
Q
Two Stroke Cycle
A
- One rotation of the crankshaft
- Intake
- Compression
- Ignition
- Exhaust
- Spark Plug fires every time piston reaches top dead centre on compression stroke
7
Q
Diesel Engines
A
- Air/Fuel mixture ignited due to air being heated from compression stroke
- No separate ignition
- Fuel injected under pressure into combustion chamber
- No carburetor
- Fewer moving parts
- Greater power per pound of fuel
- Longer time between overhaul
- Heavier, Cost more, harder to balance
8
Q
4 Functions of Oil
A
- Cooling
- Sealing
- Lubrication
- Flushing
9
Q
Requirements of Oil
A
- Proper Viscosity
- High Flash Point
- Low Carbon Content
- Low Freezing Point
10
Q
Mineral Oil
A
- No Additives
- Used to break-in engine
- Granular
11
Q
Ashless Dispersant
A
- Contains dispersants
- suspends contaminants (carbon or lead)
12
Q
Additives - Detergents
A
Cleans inside of engine
13
Q
Additives - Oxidation Inhibitors
A
Improves Oil Stability
14
Q
Additives - Anticorrosion Additives
A
Deter Corrosion
15
Q
Additives - Pour Point Depressants
A
Lower the freezing point temperature
