This is a step by step guide to adding/modifying airfoil coordinates in Airfoil CAD.


1. Increase  the size of the airfoil by clicking on the button. Scroll the airfoil so that  the leading

 edge is in the centre of the airfoil window. The size of the airfoil should be such that accurate

 placing of coordinates can be made. If the size of the airfoil is too large click on the  button

to reduce the size.


If you wish to modify the leading edge radius proceed to step 2 otherwise to step 3.


2.Select a leading edge radius. If this is unknown try the default setting of 2%. Click on the

button. Move the mouse pointer within the airfoil window and position the

 Leading Edge Radius TemplateLEADING_EDGE_RADIUS_TEMPLATEin an appropriate position.


3. Click on the button. Start adding coordinates, one pair at a time by moving the mouse pointer

 in the airfoil window to the position required eg; top of Leading Edge Radius Template. Click on the left mouse button. Move the mouse pointer down, eg; bottom of Leading Edge Template and click on the left mouse button. The new coordinate pair will be shown as 2 blue spheres. Continue to add coordinate pairs starting with the top coordinate then the bottom repeating the process as many times as required.


4. Click on the button to save the new coordinates and to redraw the airfoil. If the changes are to

 your satisfaction then click on the CLOSE button to accept the changes.


Important - At any time you wish to end coordinate addition because you have made a mistake ,

 simply click on the right mouse button whilst in the airfoil window or click on the   button to 

discard the changes


Modification of a coordinate pair can be achieved by clicking on the       button. Click on this button then move the mouse pointer over the airfoil window. Click in the airfoil window near or on a coordinate pair with the left mouse button. Winfoil will search for the nearest coordinate pair and will when found , highlight the pair with a grey rectangle.

To move one of the coordinates belonging to the pair (you may only shift the coordinate up or down) click on the grey  HANDLEHANDLE and drag it up or down to the desired position. This action will automatically save the change. To undo the change, click on the button.


Deletion of a coordinate pair can be achieved by clicking on the       button. coordinate pair.

 Click on this button then move the mouse pointer over the airfoil window. Click in the airfoil window near or on a coordinate pair with the left mouse button. Winfoil will search for the nearest coordinate pair and will when found , highlight the pair with a grey rectangle. Click on the button to delete

 the coordinate pair.