Aircraft require thrust to produce enough speed for the wings to provide lift or enough thrust to
overcome the weight of the aircraft for vertical takeoff.
Durability and Reliability
Power and Weight
Fuel Economy
Operating Flexibility
Compactness
Powerplant Selection
Types of Engine
Inline Engines
Opposed Engines
V-Type Engines
Radial Engines
Reciprocating Engines
Crankshafts
Connecting Rods
The connecting rod is the link that transmits
forces between the piston and the crankshaft.
Pistons
The piston of a reciprocating engine is a
cylindrical member which moves back and forth
within a steel cylinder.
Piston Rings
The piston rings prevent leakage of gas pressure from
the combustion chamber and reduce to a minimum
the seepage of oil into the combustion chamber.
Cylinders
The portion of the engine in which the power
is developed is called the cylinder.
Firing Order
The firing order of an engine is the
sequence in which the power event occurs
in the different cylinders.
Valves
Bearings
A bearing is any surface which
supports, or is supported by,
another surface.
Operating Cycles
Four- Stroke Cycle
Intake Stroke
Compression Stroke
Power Stroke
Exhaust Stroke
Two-Stroke Cycle
Rotary Cycle
Diesel Cycle
Efficiencies
Thermal Efficiency
Mechanical Efficiency
Volumetric Efficiency
Propulsive Efficiency
Gas Turbine Engines
Consists of...
1. An air inlet, 2. Compressor section,
3. Combustion section, 4. Turbine
section, 5. Exhaust section, 6.
Accessory section, and 7. The systems
necessary for starting, lubrication,
fuel supply, and auxiliary purposes,
such as anti-icing, cooling, and
pressurization.