3.1 Lesson Outcomes
After completing this lesson, learners will be able to:
- Explain the principles of flight
- Describe the forces acting on an aircraft during flight
- Explain the principles, types, and functions of circuits
- Identify symbols associated with schematic diagrams
- Explain codes, tags, and labels used in schematic diagrams
- Describe the fundamentals of drawing schematic diagrams
- Select, read, and interpret schematic diagrams correctly
- Apply work procedures and housekeeping practices for schematic diagrams
3.2 Overview
This lesson introduces learners to the principles of flight and the relationship between aerodynamics, aircraft systems, and schematic diagrams used within RPAS operations. Learners will explore the four forces of flight, flight principles, aircraft movement, circuit fundamentals, schematic symbols, and diagram interpretation required for safe and effective RPAS operations.
3.3 Main Lesson Content
KT0101: Principles of Flight
Principles of flight refer to the fundamental concepts and laws that govern the movement of aircraft through the atmosphere.
The four main principles of flight are:
- Lift
- Weight
- Thrust
- Drag
These forces work together to enable controlled flight.
Lift
Lift is the upward force that allows an aircraft to rise and remain airborne.
How Lift is Generated
Lift is generated by:
- The movement of air over the wings
- The shape of the wing (airfoil)
The air moving faster over the top of the wing creates lower pressure compared to the underside of the wing, producing lift.
Importance of Lift
Lift helps:
- Overcome gravity
- Maintain stable flight
- Support aircraft maneuverability
Without sufficient lift, an aircraft cannot remain airborne.
Weight
Weight is the downward force caused by gravity acting on the aircraft.
Characteristics of Weight
Weight depends on:
- Aircraft mass
- Payload
- Fuel load
- Gravitational force
Importance of Weight Management
Pilots must:
- Balance aircraft weight properly
- Avoid overloading
- Maintain operational safety
Weight directly affects aircraft performance and fuel efficiency.
Thrust
Thrust is the forward force that moves the aircraft through the air.
Sources of Thrust
Thrust may be generated by:
- Propellers
- Jet engines
- Electric motors
Importance of Thrust
Thrust helps:
- Overcome drag
- Accelerate the aircraft
- Maintain flight speed
RPAS aircraft commonly use electric motors to generate thrust.
Drag
Drag is the resistance encountered by an aircraft as it moves through the air.
Types of Drag
Parasite Drag
Parasite drag results from:
- Friction between the aircraft and air
Induced Drag
Induced drag occurs because of:
- Lift generation
Reducing Drag
Aircraft designers reduce drag by:
- Improving aerodynamic design
- Streamlining aircraft structures
Reducing drag improves:
- Speed
- Fuel efficiency
- Flight performance
KT0102: Principles, Types and Functions of Circuits
Circuits allow electrical current to flow through electrical systems.
Principles of Circuits
Ohm’s Law
Ohm’s Law explains the relationship between:
- Voltage
- Current
- Resistance
Kirchhoff’s Laws
Kirchhoff’s Laws are used to:
- Analyze circuits
- Calculate current and voltage relationships
Types of Circuits
Analog Circuits
Analog circuits process:
- Continuous electrical signals
Digital Circuits
Digital circuits process:
- Binary signals
- Digital information
Mixed-Signal Circuits
Mixed-signal circuits combine:
- Analog systems
- Digital systems
Functions of Circuits
Circuits support:
- Signal processing
- Power distribution
- Control systems
- Communication systems
RPAS Applications
RPAS systems use circuits for:
- Flight control
- Navigation
- Communication
- Sensor operations
KT0103: Symbols Associated with Schematic Diagrams
Schematic diagrams use symbols to represent electrical components visually.
Common Symbols
Resistor
Represents electrical resistance.
Capacitor
Stores electrical energy.
Diode
Allows current flow in one direction.
Inductor
Stores energy in a magnetic field.
Transistor
Amplifies or switches electronic signals.
Importance of Symbols
Symbols help:
- Simplify diagrams
- Improve communication
- Standardize technical documentation
Technicians must understand symbols to interpret RPAS systems correctly.
KT0104: Codes, Tags and Labels
Codes, tags, and labels identify components and systems within schematic diagrams.
Codes
Codes represent:
- Instructions
- Functions
- Operational systems
Tags
Tags provide:
- Metadata
- Descriptive information
- System identification
Labels
Labels identify:
- Product information
- Wiring details
- Component names
Importance
Codes, tags, and labels help:
- Improve maintenance
- Support troubleshooting
- Improve operational accuracy
KT0105: Fundamentals of Drawing a Schematic Diagram
Schematic diagrams visually represent systems using symbols and connection lines.
Steps in Drawing a Schematic Diagram
Identify Components
Determine all components required in the system.
Choose Symbols
Use standardized symbols for each component.
Draw Connections
Connect components using proper circuit lines.
Label Components
Add labels and tags for clarity.
Add Additional Information
Include notes, measurements, or operational details.
Reviewing the Diagram
Technicians should:
- Check accuracy
- Verify connections
- Improve readability
Importance within RPAS
Schematic diagrams help RPAS technicians:
- Understand systems
- Diagnose faults
- Perform maintenance
- Improve operational reliability
3.5 Key Notes / Summary
- The four forces of flight are lift, weight, thrust, and drag
- Lift keeps aircraft airborne while thrust moves aircraft forward
- Drag opposes aircraft movement
- Circuits support electrical and electronic RPAS systems
- Analog and digital circuits perform different functions
- Schematic diagrams use standardized symbols
- Codes, tags, and labels improve technical identification
- Schematic diagrams support troubleshooting and maintenance