AERONAUTICAL LECTURING NOTES

What is parafoil? A leading edge opened aerofoil is called as “Parafoil”. We know already that leading edge is facing into the wind for aerofoil. Since it has been opened, it just admits the air to flow inside the volume covered by the upper and lower surfaces. How aerofoil creates lift? What is bernouli's principle? How it suits to the aerofoil? Aerofoil has its upper surface curved, whereas bottom is moreover flat. Physically the curved portion accelerates the flow and so the top side airflow is getting increase in velocity. Lower surface is experiencing less velocity when comparing the upper surface. We know from Bernoulis law that for a fluid flow, if fluid velocity increases then pressure drops. In the upper we are feeling less pressure and in the bottom a high one. Bernoulis principle: Total energy of a steady flowing fluid system is constant. Ʃ E= k PE+KE= k mgh+0.5 mv 2 =k dividing both sides by volume ρgh+ 0.5ρv 2 =k High p...

What is aerodynamics? Aerodynamics is the study about the object moving in airflow. Here we will pay our attention to the airflow and also to the object immersed in the airflow. What is aerofoil? If you throw a pencil in air, you see, it flies and comes down instantly. So it is also having ability to fly. Technically speaking, every object is having some figures called Coefficient of lift, Coefficient of drag which governs its motion during flight. The shape which has more coefficient of lift and less coefficient of drag can stay in fly for more. Such a shape is what aerofoil. Aerofoil is having top surface (Upper camber) and lower surface (lower camber). Also it has leading edge and trailing edge where the two surfaces meet. Leading edge is facing to the wind. What is chord line? A line joining the leading edge of an aerofoil to the Trailing edge is known as Chord line. What is camber line? We know that aerofoil is having top surface (upper camber)and bot...