Skeleton line

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Skeleton line (red), with construction circles
Skeleton line (red), profile chord (blue)

As a skeleton line (including profile center line or camber line or curved line ) is defined as the line connecting the inscribed in a circle centers profile. The skeleton line runs straight from the center of the nose circle to the profile nose.

Another definition is: the skeleton line consists of the midpoints between the top and bottom perpendicular to the X coordinate or chord .

The course of the skeleton line determines the flow properties significantly. Important geometric indicators are the arch height and the arch reserve (see profile (fluid mechanics) ). Wing profiles with a straight or S-shaped skeleton line have a pressure point that changes only slightly with the angle of attack . This is advantageous , for example, for flying wing aircraft or for elongated rotor blades .

The skeleton line of airfoil profiles is usually curved upwards for the purpose of higher lift and a better glide ratio . Exceptions are the symmetrical profiles, which are used as wing profiles in supersonic aircraft, rotor blades for helicopters, elevators and stabilizing wings for rockets (see e.g. NACA profiles of the 00xx series).

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