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Unit 24 - Bernoulli Principal And Flight
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Unit 24 - Bernoulli Principal And Flight

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The Bernoulli Principal and the History of Flight

The Bernoulli Principal and the History of Flight

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  • 1. Unit 24
    History of Flight and Bernoulli’s Principal
  • 2. Bernoulli's Principle
  • 3. Bernoulli's Principle
    The pressure exerted by a moving stream of fluid is less than its surrounding fluid.
  • 4. Bernoulli's Principle
    Therefore, as the speed of the fluid increases its pressure decreases.
  • 5. Feather and Flaps
    They both act to change the angle of air over the wing to control lift
  • 6. There are many forces acting on an aircraft.
    The thrust must be sufficient to overcome drag to give enough lift to overcome gravity
  • 7. How Do Birds Do It?
    They have hollow bones to be very light weight and their strongest muscles are their breast muscles to generate thrust.
  • 8.
  • 9. Use of Lift by Animals
    Riding “thermals” condors and hawks can soar for hours without flapping their wings.
  • 10. Use of Lift by Animals
    Riding “ocean breezes” albatrosses can literally fly for days between wing flaps just feet above the water.
  • 11. Use of Lift by Animals
    Flying fish use their fins as wings to fly above the water. This reduces drag, allowing them to go faster and to avoid predators.
    Penguins use their wings to “fly” underwater at high velocity
  • 12. Variations on the ThemeOther Examples of Bernoulli’s Principal
    Paper airplanes, frisbees, and boomerangs are all examples of using Bernoulli’s Principal to get lift.
  • 13. Variations on the ThemeOther Examples of Bernoulli’s Principal
    Hydroplanes use lift to reduce the boat’s drag in the water, allowed them to hit speeds in excess of 150 mph
  • 14. Variations on the ThemeOther Examples of Bernoulli’s Principal
    Hydroplanes use lift to reduce the boat’s drag in the water, allowed them to hit speeds in excess of 150 mph
    However, if they get too far out of the water, it can be bad news.
  • 15. Hydrofoils
    Hydrofoils use “wings” underwater to create lift, to reduce drag, for high speed ferries.
  • 16. Variations on the ThemeOther Examples of Bernoulli’s Principal
    The Stealth Fighter and Stealth Bomber are so unstable to fly, that pilots do not actually control them.
    They are controlled almost completely by computers
  • 17. Variations on Flight Today
    Helicopters push air downward to rise
    The osprey is half-helicopter half-airplane
    The Harrier can rotate its jets downward to take off or land vertically, or can flight like a normal plane
  • 18. History of Flight
    1000 BC to Present
  • 19. 1000 BC
    Chinese Invent Kites
  • 20. 15th Century
    Leonardo Da Vinci, using the basic principals of flight, draws and explains various possible aircraft types.
    He never built or attempted to fly them himself.
  • 21. 1670’s
    Giovanni Borelli, a mathematician calculates human muscles are not strong enough for flight.
    Many attempted before and some still try afterwards.
  • 22. 1783
    Jean François Pilâtre de Rozier and Marquis d'Arlandes make first successful flight in hot air balloon in France.
    Theyused the concept of bouyancy of gases and density changes withtemperature.
  • 23. 1797
    André Jacques Garnerinis first to successfully descend to the ground on a parachute.
  • 24. 1852
    Henri Giffard makes first steam powered airship that can be propelled and controlled.
  • 25. 1891
    Otto Lilienthal starts flying first successful gliders
  • 26. 1902
    Orville and Wilbur Wright begin flying gliders in preparation for their powered flight attempts.
  • 27. 1903
    The Wright Brothers make first successful powered flights at Kittyhawk, NC
    First flight only lasted 12 seconds and went 120 feet. The longest was 893 feet.
  • 28. So Much More Has Occurred Since
    It took many years before flying was common.
    In doing your assignment, look up advances in flight technology that occurred after the Wright Brothers.