Sketching the Second Four-Sided Surface

To sketch the second left hand wing surface:

1. Zoom in on the bottom of the left hand wing area.
   
   
2. If you are not already in Surface Creation mode, click on the Create Surface button .
   
   
3. Leave the current settings in Curve and Surface Fitting dialog box as we want to use the same number of internals, that is, 12 along the long boundary, and 7 on the short boundary to match the internals used for the first surface.
   
   
4. Click on the first two points as shown below. This uses a corner point from first surface and projects the first boundary along the curved wheel arch.

5. Rotate the model so that the bottom curve looks like a straight line, as shown below.

Note: If you want, you can use the Crosshair Cursor, , to line up the points. This has the drawback however that you must position the view so that the surface boundary is horizontal in the view.

6. Click on Point 3, as shown above. CopyCAD uses the current view to project the surface boundary along the curve.
   
   
7. Click on the View from Top button , then zoom in so that the model is in the view shown below.

8. Hold down the Ctrl key and click to position guidepoints for the third boundary as shown below, then click on Point 4, which is a corner point from the first surface.
   
   
9. Click on Point 1 again to share the first surface's boundary.
   
   
10. Click on the Resize to Fit button , to see the whole of the model as shown below.

This view shows the shaded surface. To check its accuracy, click on the Shade Errors button, . If there are large areas of red shading, delete the surface using the button, and try again..

Tip: You can see the problem areas by rotating the model to see if the surface boundary has fallen off the triangle model.

You can now sketch the surfaces on the other wing. Make sure that you select the corner points in an anti-clockwise direction so that the surface is correctly orientated. Also, you should ensure that you pick the long surface boundaries first and third, so that the correct number of breakpoints are used for each boundary.

Next:

Sketching the Inlet Base Surfaces