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VSP uses its own file format for airfoil points. Some example airfoil files are included in the 'airfoils' directory of the distribution. The example file representing a NACA 23015 is included below.
The file starts out with a simple header. The first line is a comment field, it is unused by VSP. The second line is the airfoil name which will be displayed in VSP. The third line is a flag to indicate a symmetrical airfoil. The fourth and fifth lines specify the number of points which define the upper and lower surfaces.
The surfaces are given as a series of (x, y) pairs. The top surface first, then the bottom surface. Points are specified from leading edge to trailing edge. There is a blank line between the two sets of points.
Typically, the leading edge will be at (0, 0) and the trailing edge at (1, 0). However, VSP does not check or enforce this. Airfoils with points which extend beyond the x-range of [0, 1] can be used to model high lift systems.
DEMO GEOM AIRFOIL FILE NACA 23015 0 Sym Flag (0 - No, 1 - Yes) 18 Num Pnts Upper 18 Num Pnts Lower 0.0000 0.0000 0.0125 0.0334 0.0250 0.0444 0.0500 0.0589 0.0750 0.0690 0.1000 0.0764 0.1500 0.0852 0.2000 0.0892 0.2500 0.0908 0.3000 0.0905 0.4000 0.0859 0.5000 0.0774 0.6000 0.0661 0.7000 0.0525 0.8000 0.0373 0.9000 0.0204 0.9500 0.0112 1.00000 0.0000 0.0000 -0.0000 0.0125 -0.0154 0.0250 -0.0225 0.0500 -0.0304 0.0750 -0.0361 0.1000 -0.0409 0.1500 -0.0484 0.2000 -0.0541 0.2500 -0.0578 0.3000 -0.0596 0.4000 -0.0592 0.5000 -0.0550 0.6000 -0.0481 0.7000 -0.0391 0.8000 -0.0283 0.9000 -0.0159 0.9500 -0.0090 1.00000 -0.0000
Document cabin layout file here.
VSP uses its own file format for fuselage cross sections. An example cross section file is included in the 'fuselage' directory of the distribution. The example file representing a square box is included below.
The file starts out with a simple header. The first line is a comment field, it is unused by VSP. The second line is the cross section name which will be displayed in VSP. The third line is the number of points in the cross section definition.
After the header, there is a list of (x, y) pairs for the points which define the cross section. Only the positive-x half of the fuselage shape is specified – symmetry is assumed. Points are specified in clockwise order.
VSP will allow you to scale the height and width of a fuselage section defined by the points in the file.
VSP will fit a smooth surface through the specified points. This smoothing can make sharp corners problematic. In the example below, points were clustered near the corners to try to help VSP represent the corners.
FUSE XSEC FILE Box 17 NumPnts 0 1 0.5 1 0.7 1 0.9 1 0.98 0.98 1 0.9 1 0.7 1 0.5 1 0 1 -0.5 1 -0.7 1 -0.9 0.98 -0.98 0.9 -1 0.7 -1 0.5 -1 0 -1
XSec Hermite wireframe file
VSP uses industry standard JPEG files for input and output of images.
The two main uses of JPEG images in VSP are to save a copy of the display window and display a background image on the display window. The background image may be a beautiful sunset or a 3-view drawing to match the model.
Background images can also be displayed when editing a fuselage cross section. Finally, JPEG images can be used as textures applied to the surface of the model.
VSP can use TARGA image files as textures applied to the models. TGA files support transparency, which can be very handy when making non-repeating textures.
Document native VSP file