<s>
XFOIL	B-Application
is	O
an	O
interactive	O
program	O
for	O
the	O
design	O
and	O
analysis	O
of	O
subsonic	O
isolated	O
airfoils	O
.	O
</s>
<s>
Given	O
the	O
coordinates	O
specifying	O
the	O
shape	O
of	O
a	O
2D	O
airfoil	O
,	O
Reynolds	O
and	O
Mach	O
numbers	O
,	O
XFOIL	B-Application
can	O
calculate	O
the	O
pressure	O
distribution	O
on	O
the	O
airfoil	O
and	O
hence	O
lift	O
and	O
drag	O
characteristics	O
.	O
</s>
<s>
It	O
is	O
released	O
under	O
the	O
GNU	B-License
GPL	I-License
.	O
</s>
<s>
XFOIL	B-Application
was	O
first	O
developed	O
by	O
Mark	O
Drela	O
at	O
MIT	O
as	O
a	O
design	O
tool	O
for	O
the	O
MIT	O
Daedalus	O
project	O
in	O
the	O
1980s	O
.	O
</s>
<s>
XFOIL	B-Application
is	O
written	O
in	O
FORTRAN	B-Application
.	O
</s>
<s>
XFOIL	B-Application
was	O
translated	O
to	O
the	O
C++	O
language	O
and	O
integrated	O
in	O
the	O
program	O
XFLR5	O
,	O
principally	O
for	O
use	O
on	O
model	O
aircraft	O
design	O
.	O
</s>
<s>
A	O
MATLAB	B-Language
implementation	O
called	O
has	O
been	O
written	O
.	O
</s>
<s>
It	O
is	O
written	O
in	O
Java	B-Language
.	O
</s>
<s>
QBlade	B-Language
implements	O
XFOIL	B-Application
via	O
XFLR5	O
for	O
use	O
in	O
wind	O
turbine	O
design	O
.	O
</s>
<s>
OpenVSP	B-Application
is	O
a	O
parametric	O
aircraft	O
geometry	O
and	O
aerodynamic	O
analysis	O
tool	O
supported	O
by	O
NASA	O
.	O
</s>
