Winfoil

Airfoil ListAirfoil_List 

Other Available Tabs;

Airfoil TabAirfoil_Tab 

Airfoil Polar GraphAirfoil_Polar_Graph 

Lift Graph TabLift_Graph_Tab 

Lift Drag Data Maintenance TabLift_Drag_Data_Maintenance_Tab 

Airfoil CAD TabAirfoil_CAD_Tab 

To get to this Tab

1. Open the Airfoil List screen by selecting the Airfoil List menu item from the File Menu or

click on the Airfoil List toolbar button.

2. Click on the Coordinates Tab.

This tab is provided to allow airfoil coordinates to be entered, deleted or changed. Three different formats are provided;

To change format you must click on the appropriate radio button at the bottom of the Tab.

NACA Format

Naca airfoil coordinate format is as follows;

Where;

Xupper is the upper surface x coordinate measured  as a percentage of the chord from the leading edge. A value of 0 indicates that the coordinate is at the leading edge and a value of 100 indicates that the coordinate is at the trailing edge.

Yupper is the upper surface y coordinate measured as a percentage of the chord.

Xlower is the lower surface x coordinate and is measured as a percentage of the chord from the leading edge.

Ylower is the lower surface y coordinate measured as a percentage of the chord.

The Xlower coordinate does not have to match the Xupper coordinate.

Coordinates start from the leading edge of the airfoil for both top and bottom surfaces and continue to the  trailing edge.

EPPLER Format

Eppler airfoil coordinate format is as follows;

Where;

X is the X coordinate expressed as a ratio of the chord from the leading edge. A value of 0 indicates that the coordinate is at the leading edge. A value of 1.0 indicates that the coordinate is at the trailing edge.

Y  is the y coordinate expressed as a ratio of the chord. 

Coordinates start from the trailing edge of the airfoil continuing along the top surface to the leading edge then along the lower surface to the trailing edge.

EPPLER 100 Format

This format is identical to the EPPLER format above except that the coordinates are expressed as a percentage. A value of 0 represents the start or leading edge and 100 represents the end or trailing edge.

To Add a New Coordinate;

Click on the New button or press the Insert key

To Change or Edit an existing Coordinate;

Double click on the coordinate or select the coordinate by clicking on it then click on the Change button or press the Enter key.

To Delete a Coordinate;

Select the coordinate by clicking on it then click on the Delete button or press the Delete key.

If the Eppler or Eppler 100 format airfoil coordinates are selected then an additional button will be presented. This is the Insert button which is used to insert a coordinate before the currently selected coordinate.

Three additional boxes are provided to enter;

To update, amend or clear these values , type the value into the box and select another airfoil from the list of airfoils.

You can now copy airfoil coordinates to the clipboard in this tab.This feature is activated by right clicking on the coordinate grid and clicking on the Copy Coordinates to Clipboard popup menu item. This data can then be used to populate web page input fields or as a means to transfer data to other programs.