The NACA airfoil designation system is a way to classify airfoils based on specific numerical codes that represent their geometrical features. Let's examine the statements given about the NACA airfoil code "XYZZ":
-
The X stands for the camber as a percentage of the wing chord length.
- True: In the NACA 4-digit airfoil code, the first digit (X) indicates the maximum camber as a percentage of the chord length.
-
The Y indicates the thickness of the airfoil.
- True: In the NACA 4-digit airfoil code, the second digit (Y) represents the maximum thickness of the airfoil as a percentage of the chord length.
-
When ZZ is 00, then the NACA-code is non-realistic.
- False: A NACA airfoil code ending in "00" does have a valid interpretation; it typically corresponds to an airfoil with a certain camber and thickness but no specific refinements (like camber or length modifications).
-
When XY is 00, then the airfoil is a symmetric airfoil.
- True: If the first two digits (XY) are both 0, it indicates that the airfoil is symmetric, as there is no camber (X=0) and the thickness is specified as part of the standard asymmetric airfoil designation.
In summary, the truths of the statements are:
- True
- True
- False
- True
1 answer