Autodidact said:. Typhoon Active Member. Joined Apr 21, Messages 31 Location Germany. Is this right? On the other Hand I see that XFLR5 doesn't define very well the stall moment.
Hi people! How much is reliable the XFLR5 for our scale? The Re num are differents and in program Guideline stays: The code has been intended and written exclusively for the design of model sailplanes, for which it gives reasonable and consistent results. The code's use for all other purpose, especially for the design of real size aircraft is strongly disapproved.
Maybe the results for Re 3M are not so precise as I wanted Thank you! Typhoon said:. I think that statement has more to do with avoiding liability than any technical limitation. The developer is an aeromodeller, and has written his program with that use in mind. It seems he is understandably nervous about the use of his program for man-carrying aircraft. That said, I don't see anything in his methods so far, anyway that are different than what we would use for full-scale.
He seems to have done his homework. Personally, I would not rely on a single software program without some way of validating the results, no matter where the program came from. To paraphrase a famous 's quotation, "Trust, but verify. David Lednicer who worked for John Roncz had some skepticism about Riblett back in Riblett airfoils Walter Lounsbery, David Lednicer, "highflyer" However, Riblett has also been discussed here on this forum.
XFoil - by Mark Drela. XFOIL is an interactive program for the design and analysis of subsonic isolated single-segment airfoils. XoptFiol - airfoil optimisation with XFoil. R esults show an excellent comparison to published wind tunnel data. When compared with XFoil Version 6.
P rogram output is in a variety of forms. Graphical views are in a format similar to published wind tunnel results. Tabulated results may be printed directly or saved in a text file to be imported into other analytical software. AeroFoil's most powerful feature is its ability to create new airfoils using what is known as inverse design.
The design process is fully automated and requires no unusual knowledge of aerodynamics. U sing nothing more than slider bars and radio buttons, the AeroFoil user can tailor specific regions of an airfoil to meet the desired design parameters. No other inverse design software is as simple to use. By convention, a white box with black numbers is an input box and you can change the value of the number. A black box with yellow numbers is an output box and the value is computed by the program. To change the value in an input box, select the box by moving the cursor into the box and clicking the mouse, then backspace over the old number, enter a new number, then hit the Enter key on your keyboard.
You must hit Enter to send the new value to the program. For most input variables you can also use a slider located next to the input box. Click on the slider bar, hold down and drag the slider bar to change values, or you can click on the arrows at either end of the slider. At any time, to return to the original default conditions, click the red Reset button at the upper right of the program. The program screen is divided into four main parts:. The View Window contains a schematic drawing of the wing that you are designing and some buttons to control the schematic drawing.
Possible choices are colored blue while the selected option is colored yellow. There are several different output options available for the Output Window at the lower right. You select the type of output by using the push buttons on the control panel. The default setting is Plot and a graph will appear in the window. The type of graph is described below and you can vary the plot by using the Plot Selection input panel. If you display a plot and begin to change the input variables, it may become necessary to rescale the plot axes by pushing the white Rescale button at the lower left of the window.
The types of available plots are listed below. The Gages shows the current value of lift or lift coefficient and drag or drag coefficient displayed in scientific notation. The gages are displayed in the output window and move as the lift and drag are varied. This display shows the relative sensitivity of lift and drag to the input variables. The Probe lets you explore the flow around the wing.
A probe control panel appears in the output window when you select "Probe" from the control panel.
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