Lesson Notes By Weeks and Term v4 - SHS 2
Aerodynamics and Propulsion
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Aerodynamics and Propulsion
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Subject: Aviation And Aerospace Engineering
Class: SHS 2
Term: 1st Term
Week: 5
Grade code: 2.1.2.LI.2
Strand code: 1
Sub-strand code: 2
Content standard code: 2.1.2.CS.3
Indicator code: 2.1.2.LI.2
Theme: Core Concepts in Aerospace Engineering
Subtheme: Aerodynamics and Propulsion
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This lesson focuses on thrust, the fundamental force that moves aircraft and spacecraft through the air and into space. We will explore how different engines—from the piston engines in small planes you might see at Kotoka International Airport to the powerful jet engines on commercial airliners and the rocket engines that could one day take a Ghanaian to space—generate this crucial force. Understanding how to calculate thrust is essential for designing, building, and safely operating any flying machine. In Ghana, as our aviation sector grows and the use of drones in agriculture and delivery becomes more common, understanding these principles is more relevant than ever.
A. What is Thrust?
Thrust is a reaction force described by Newton's Third Law of Motion. This law states that for every action, there is an equal and opposite reaction.
In aerospace, the "action" is the engine pushing a mass of gas (air or exhaust) backwards. The "reaction" is the engine and the aircraft being pushed forwards. Think of it like this: When you let go of an inflated but untied balloon, the air rushes out backward (action), and the balloon flies forward (reaction). Unit of Thrust: Since thrust is a force, it is measured in Newtons (N). B. Propulsion Systems and Thrust Calculation
We will examine four main types of propulsion systems and learn how to calculate their thrust. Jet Engines (Turbojets and Turbofans)