Lesson Notes By Weeks and Term v4 - SHS 1
Fundamentals of Flight
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Fundamentals of Flight
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Subject: Aviation And Aerospace Engineering
Class: SHS 1
Term: 1st Term
Week: 5
Grade code: 1.1.1.LI.2
Strand code: 1
Sub-strand code: 1
Content standard code: 1.1.1.CS.1
Indicator code: 1.1.1.LI.2
Theme: Core Concepts in Aerospace Engineering
Subtheme: Fundamentals of Flight
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When we look up in the sky over Accra, Kumasi, or Tamale and see an aeroplane, we often take it for granted. But how did humanity achieve this incredible feat? For thousands of years, people dreamed of flying like birds. This lesson will take us on a historical journey to understand the key steps, the brilliant minds, and the persistent efforts that turned the dream of flight into a reality. Understanding this history helps us appreciate the engineering process of trial, error, and breakthrough that is central to all aviation and aerospace engineering.
This topic traces the step-by-step evolution of flight. We will break it down into four key stages. Stage 1: Ancient Dreams and Early Observations (Antiquity – c. 1700s)
For centuries, humans observed birds and were inspired to fly. This stage was defined by imagination, not science. Mythology: Stories like the Greek myth of Icarus and Daedalus, who made wings of feathers and wax, show the deep-seated human desire to fly. Early Inventions: The earliest practical flying object was the kite, invented in China around 400 BC. Kites demonstrated the principle that moving air could lift an object. Visionary Designs: Leonardo da Vinci (c. 1500) studied birds and sketched many flying machines, including the "ornithopter" (a machine with flapping wings). His designs were brilliant but could not be built with the materials and power sources of his time. He understood that air was a fluid that could be pushed against.
Key takeaway: This era was about *dreaming* and *observing*, not yet achieving flight. Stage 2: The Dawn of Flight - Lighter-Than-Air (1783)
The first time humans successfully left the ground was not by flapping wings, but by floating. This is called Lighter-Than-Air Flight. Definition: Lighter-than-air flight works by using a large bag or envelope filled with a gas that is less dense (lighter) than the surrounding air. The buoyant force of the air pushes the craft upwards, just like a log floats on water. The Montgolfier Brothers: In 1783, Joseph-Michel and Jacques-Étienne Montgolfier from France created the first successful hot air balloon. How it worked: They lit a fire under a large paper and silk bag. The fire heated the air inside the bag. Hot air expands and becomes less dense than the cool air outside. This difference in density created lift, and the balloon rose. First Flights: They first sent up a sheep, a duck, and a rooster. A few months later, on November 21, 1783, two men made the first untethered human flight, floating over Paris for about 25 minutes. Limitation: While a major breakthrough, balloons could not be steered. They were at the mercy of the wind. They achieved flight, but not *controlled* flight.