Airbus 380 or Cessna 172, big or small, they all adhere to the same physical laws. This video shows how the formula for lift can be used to demonstrate the relationship between aircraft weight, airspeed, and angle of attack.
Weight is commonly, but not 100 % correctly, used to describe mass in kilograms (kg). “If my mass is 60 kg, my weight is 60 kg on planet Earth, but only 10 kg on the Moon.” But to be 100 % scientific, we have to use newton to measure weight, because weight is the gravitational force acting on a mass. On planet Earth, 1 kg mass equals 9.8 newtons. Enough said. After this video, I will, like everybody else, refer to weight as kg.
This video is a remake of a video I made some months ago. I have simplified the calculations and corrected some errors. When making the first video, I stumbled into a problem: How could I find the density of the atmosphere when the air is dry? There are dozens of different density calculators online, some are plain wrong, and others cannot calculate the density in kg per cubic meters when the altitude is given in feet. For this video, I selected to use the Atmospheric properties calculator (see the link below).
Attributions:
Airbus S.A.S: Airbus 380 departure.
Gevers Aircraft: Genesis aircraft with telescopic wings.
Jeffrey A. Scott: Drag Coefficient & Lifting Line Theory www.aerospacewe...
John McIver: Cessna Skyhawk performance assessment www.temporal.co...
Recommended links:
“Bernoulli or Newton?” • Video
Atmospheric properties calculator: www.aerospacewe...
Recommended reading:
John T. Lowry: Performance of light aircraft. ISBN 1563473305, 9781563473302.
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