NACA
- Last UpdatedOct 06, 2023
- 2 minute read
Purpose
Generate a four digit NACA series aerofoil section as a Cline.
Syntax
NACA $W $N < $N > < $N > < /LOWER > < /LAYER $N >
Description
Given a user specified name and a four digit code, the command generates a NACA section as a Cline. Optionally the user can specify the length of the NACA section and the number of points generated to create the curve.
The NACA 4-digit code is defined as illustrated and described below.
The first integer indicates the maximum deflection, Cmax, of the camber (mean) line as a percentage of the chord length, c. The second integer indicates the distance from the leading edge to the location of the maximum camber, XCmax, given in tenths of the chord length (that means, 3 equals 30%). The last two integers indicate the section thickness, t, as a percentage of the chord. Aerofoil numbers starting with 00 (Cmax and XCmax) have no camber, and are referred to as symmetric aerofoils.
By default the command creates the NACA section for an upper part of an aerofoil, optionally the user can specify that the lower part is created.
The Cline is generated in the plane of the working coordinate system and stored using the user specified name, on the current layer, unless a specific layer is given.
Command Qualifiers
|
$W |
Name under which the curve is stored. |
|
$N |
Four digit NACA series code. The four digits have the following meanings. The first integer indicates the maximum deflection, Cmax, of the camber (mean) line as a percentage of the chord length, c. The second integer indicates the distance from the leading edge to the location of the maximum camber, given in tenths of the chord length (that means, 3 equals 30%). The last two integers indicate the section thickness, t, as a percentage of the chord. |
|
$N |
The first optional $N specifies the chord length of the NACA section. The default value is 1. |
|
$N |
The second optional $N specifies the number of points used to generate the curve. The default is 10. |
|
LOWER |
Specifies that the lower half of a NACA section is to be generated. By default an upper section will be generated. |
|
LAYER $N |
Specifies a layer number on which the Cline is stored. |