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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    Unit 24 - Bernoulli Principal And Flight Unit 24 - Bernoulli Principal And Flight Presentation Transcript

    • Unit 24
      History of Flight and Bernoulli’s Principal
    • Bernoulli's Principle
    • Bernoulli's Principle
      The pressure exerted by a moving stream of fluid is less than its surrounding fluid.
    • Bernoulli's Principle
      Therefore, as the speed of the fluid increases its pressure decreases.
    • Feather and Flaps
      They both act to change the angle of air over the wing to control lift
    • There are many forces acting on an aircraft.
      The thrust must be sufficient to overcome drag to give enough lift to overcome gravity
    • 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.
    • Use of Lift by Animals
      Riding “thermals” condors and hawks can soar for hours without flapping their wings.
    • Use of Lift by Animals
      Riding “ocean breezes” albatrosses can literally fly for days between wing flaps just feet above the water.
    • 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
    • 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.
    • 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
    • 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.
    • Hydrofoils
      Hydrofoils use “wings” underwater to create lift, to reduce drag, for high speed ferries.
    • 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
    • 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
    • History of Flight
      1000 BC to Present
    • 1000 BC
      Chinese Invent Kites
    • 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.
    • 1670’s
      Giovanni Borelli, a mathematician calculates human muscles are not strong enough for flight.
      Many attempted before and some still try afterwards.
    • 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.
    • 1797
      André Jacques Garnerinis first to successfully descend to the ground on a parachute.
    • 1852
      Henri Giffard makes first steam powered airship that can be propelled and controlled.
    • 1891
      Otto Lilienthal starts flying first successful gliders
    • 1902
      Orville and Wilbur Wright begin flying gliders in preparation for their powered flight attempts.
    • 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.
    • 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.