Clockwork Drives (Human Energy)
External Thermal Engines
- Steam Engine
- Stirling Engine
- Nuclear Engine
Internal Thermal Engines
- Intermittent Combustion
  - Reciprocating Engine / Piston Engine
    - By Fuel
      - Gasoline Engine
      - Diesel Engine
    - By Layout
      - In-Line
      - Flat / Boxer / Horizontal / Opposed
      - V-Type
      - W-Type
      - X-Type
      - Rotary (Rotary Crankcase)
      - Radial (Cylinders Radiate Outward)
  - Rotary Engine / Wankel Engine
- Air Breathing / Continuous Compression
  - Gas Turbine Engine
    - Types
      - Turbo Prop (Turbine Engine that drives a Propeller)
        
        Efficient at low speeds and altitudes, best for regional airliners and cargo planes
        
        Typically operate at below Mach 0.6
      - Turbo Shaft
      - Prop Fan
Electric Motors

Reaction Engines

Jet Engines
- Air Breathing / Continuous Combustion
  - Gas Turbine Engine
    - Types
      - Turbo Jet (Jet Engines that produce Thrust from the direct impulse of the Exhaust)
        
        Capable of high speeds, making them suitable for supersonic and high-altitude flight
        
        Typically operate at above Mach 0.8
      - Turbofan / Fan Jet
  - Advanced Technology Engine
  - Ram Compression
    - Types
      - Ram Jet
        
        Most efficient at speeds above Mach 2
        
        Types
        
        Air Turbo Ram Jet (Combines Turbojet and Ramjet)
        
        Dual-Mode Ram Jet
      - Scram Jet / Supersonic Compression Ram Jets
        
        They operate in the hypersonic range, above Mach 5
      - Shcram Jet / Shock Compression Ram Jets
  - Non-Continuous Compression
    - Types
      - Motor Jet
      - Pulse Jet
        
        Types
        
        Valveless Pulse Jet
        
        Gluhareff Pressure Jet
      - Pulse Detonation Engine
- Rocket Engines
  - Types
    - Nuclear Thermal Rocket
    - Aerospike Engine
- Hybrid Engines
  - Types
    - Air-Augmented Rocket
      - Pre-cooled Jets / Liquid Air Cycle Engine (LACE)
    - Air Turbo Rocket
      - Turborocket (Combines Turbo Jet and Rocket)
      - Air Turbo Ram Jet (Combines Turbo Jet and Ram Jet)
- Pump Jet / Hydro Jet / Water Jet
  - Used for Marine Propulsion
  - The Pump Jet must be driven by a separate engine such as a Diesel or Gas Turbine
- Spacecraft Electric Propulsion
  - Ion and Plasma Drives
    - Electrostatic / Ion Thrusters
    - Electrothermal
      - Resistojet
      - Arcjet
      - Microwave
      - Variable Specific Impulse Magnetoplasma Rocket (VASIMR)
    - Electromagnetic / Plasma Propulsion Engine
Rotating Detonation Engine

Considerations

Understand Shock Waves to design efficient Aircraft Engines.

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