Design ListDesign_List 

Other Available Tabs

Detail TabDetail_Tab 

Performance TabPerformance_Tab 

Power Required TabPower_Required_Tab 

Lift to Drag Ratio TabLift_to_Drag_Ratio_Tab 

Design CAD TabDesign_CAD_Tab 


This tab is used to define items of an aircraft for which the drag will be calculated to determine aircraft performance. These items have been predefined in the system parameters setup and may be altered for any design configuration. Please note that modification of these items for an aircraft configuration is only possible in the registered version of Winfoil. 


The available aircraft configurations are;


Monoplane

Biplane

Canard

Flying Wing

Tandem Wing


The following information is displayed for each item;


Item Name

eg; Wing

Description

This is a comment on what type of area is needed for the drag calculation. This varies according to the item and the available drag coefficients.

For example;


Wing                Wing Area


Wheel                Frontal Area

Cd

Drag Coefficient. This can either be automatically obtained from data stored in Winfoil or entered manually.

Area

This is the area used to calculate drag for the item. This is calculated in the units which are selected at the bottom of the Tab. All areas use the same units of measurement.

Flat Plate Area

This is the calculated drag of an item.


Flat Plate Area = Cd (Drag Coefficient)  X  Area


At the bottom of the tab the total Flat Plate Area is displayed. This is a summation of the flat plate area for each item. This value will be used to calculate the performance of an aircraft.


The two buttons provided on this tab are;


Change

Used to change the currently selected drag items area, drag coefficient and if a Wing, the aspect ratio. Click on this button to open the Edit Drag Breakdown ItemEdit_Drag_Breakdown_Item screen. You may also access this screen by double clicking on a drag item.

Default

This button is used to reset the drag items. This button will clear the drag items and recreate them based on the definitions for the aircraft configuration. This button is useful if the items have been changed.


The Cl Max text box contains the estimated maximum lift coefficient for the wing and is used to determine the stall speed of the design. This value initially defaults to the Maxmium Lift Coefficient value in the Performance tab of the PreferencesPreferences screen.


The Propeller Efficiency text box contains the estimated maximum propeller efficiency and is used in determining the maximum speed of a design. This value initially defaults to the Maxmium Propeller Efficiency value in the Performance tab of the Preferences screen.


The Units  dropdown list at the bottom of the screen is used to set the units of measurement used for the area for each drag item. The units selected in this screen do not have to match the units used in other tabs. Winfoil will automatically convert the units between tabs.