How is the thickness of an aerofoil section measured?
The thickness is measured from the top surface to the bottom surface at the point of maximum thickness. The relative thickness is the “thickness/chord ratio” (t/c ratio) and is the maximum thickness of the aerofoil expressed as a percentage of the chord.
What is airfoil nomenclature?
The forward section of the airfoil is named the leading edge and the rear the trailing edge. The airfoil upper and lower surfaces meet at the leading and trailing edges. The length of the airfoil from leading to trailing edge is known as the airfoil chord.
What is the mean camber line of an airfoil?
The mean camber line is an imaginary line which lies halfway between the upper surface and lower surface of the airfoil and intersects the chord line at the leading and trailing edges. But between the leading and trailing edge the camber line can curve above or below the chord line.
What is thickness in an aerofoil?
The thickness of an airfoil varies along the chord. It may be measured in either of two ways: Thickness measured perpendicular to the camber line.
How do you read a 4 digit NACA airfoil?
The NACA four-digit wing sections define the profile by:
- First digit describing maximum camber as percentage of the chord.
- Second digit describing the distance of maximum camber from the airfoil leading edge in tenths of the chord.
- Last two digits describing maximum thickness of the airfoil as percent of the chord.
What does the 4 digit numbers mean in NACA airfoil for instance what does it mean by 0012 in NACA 0012?
Nomenclature of NACA 4 digit Airfoil The four digits of NACA 4-digit airfoil indicates the following; For NACA 2412 airfoil, the maximum camber is 2\% of the chord length. The second digit indicates the position of maximum camber from the airfoil leading edge in tenths of the chord.