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11.

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.

12.

XFLR5's development history

13.

The primary purposes for the development of XFLR5 were to provide:

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A user-friendly interface for XFoil

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A translation of the original FORTRAN source code to the C/C++ language, for all developers who might have a need for I

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This was done in accordance with, and in the spirit of, Mark Drela's and Harold Youngren's highly valuable work, which they have been kind enough to provide free of use under the General Public License.

17.

The resulting software is not intended as a professional product, and thus it does not offer any guarantees of robustness, accuracy or product support. It is merely a personal use application, developed as a hobby, and provided under GPL rules for use by all.

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For this reason, it should be noted and understood that XFLR5 may not be default-free. Some significant bugs affecting result precision have been reported in the beta releases and corrected. However, XFLR5 has been thoroughly tested against other software and published experimental results, up to now with some success, and this permits a limited amount of trust in the results it provides.

19.

The algorithms for foil analysis implemented in XFLR5 are exactly the same as those of the original XFoil code, except for the translation from FORTRAN to C. No changes nor amendments have been made. The translation in itself could have caused new bugs. However, the code has been thoroughly tested against numerous original XFoil analyses, always with consistent results. It may be found, in some cases, that one of the two programs may not converge where the other will, or that the path to convergence is different from one to the other. This is due to the different manner in which floating point numbers and calculations are processed by the two compilers. Having said this, the converged results are always close, and any differences within the convergence criteria set in the XFoil source code.

20.

Hence, both XFoil and XFLR5 results of airfoil analysis will be referred to herein as "XFoil results". Wing analysis capabilities have been added in version 2.00. Initially, this was done at the suggestion of Matthieu Scherrer, who has experimented with his Mathlab "Miarex" code the application of the Non-linear Lifting Line Theory (herein referred to as "LLT") to the design of wings operating at low Reynolds numbers.