Low Aspect Ratio (short wide wings) increases Induced drag but increases Reynolds Number (good airfoil performance) and reduces structural loading ( good for aerobatics). High Aspect Ratio (long narrow wings) reduces Induced drag but lowers Reynolds Number (low airfoil performance) and increases structural loading (good for gliding). The actual lift and drag coefficients for real designs will be lower and higher depending on the Aspect Ratio of the wing or tail. Please note that this data is for infinite aspect ratios. Funfly designs rely on high drag sections for even speed through manoeuvres. Low drag is required for Pylon and Sailplane designs. The lower the drag coefficient(Cd), the lower the profile drag for a given wing or tail area. To determine the reynolds number for a wing or tail design use the REYNOLDS NUMBER GRAPH REYNOLDS_NUMBER_GRAPH_SCREEN facility provided with the WING CAD SCREEN WING_CAD The higher the lift coefficient(Cl) the greater the lift produced by an airfoil and the lower the stall speed for a given wing area. If you choose an airfoil which performs well at a low Reynolds number, the same airfoil will typically perform much better at higher Reynolds numbers. In general most airfoils suffer a loss in performance with a reduction in Reynolds numbers. Data for this tab can be entered through the Lift/Drag Data Tab or can be imported from the SOARTECH LIFT/DRAG DATA IMPORT SOARTECH_LIFT_DRAG_DATA_IMPORT screen.Īs model aircraft typically fly at low Reynolds numbers (ie small wing chords at low speeds) an airfoil which has a high lift coefficient and low drag coefficient at a low Reynolds number will have the best all-round performance. Data is provided for a number of Reynolds number readings. drag coefficient for the selected airfoil. Open the Airfoil List screen by selecting the Airfoil List menu item from the File Menu orĬlick on the Airfoil List toolbar button. Lift Drag Data Maintenance Tab Lift_Drag_Data_Maintenance_Tabġ. Airfoil Coordinates Tab Airfoil_Coordinates_Tab
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