📄 cwind.htm
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<TITLE>FDC help: Cwind</TITLE>
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<H2>Subsystem <I><FONT FACE="Arial","Helvetica","Sans Serif">Cwind</FONT></I>: constant horizontal wind</H2>
<I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Cwind</FONT></I> is a masked S<SMALL>IMULINK</SMALL> system, which is used to calculate velocity components of a constant horizontal wind along the body-axes of the aircraft. <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Cwind</FONT></I> can easily be enhanced for vertical wind-
components as well if it is unmasked first. If you want the wind velocity to vary with altitude, use <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="blwind.htm">BLwind</A></FONT></I> instead. Both <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Cwind</FONT></I> and <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">BLwind</FONT></I> are contained in the blocklibrary <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="windlib.htm">WINDLIB</A></FONT></I>.
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The user must specify the wind velocity <I>V<SUB>w</SUB></I> in [m/s] and the wind direction <I>psi_w</I> in [rad].<BR>
<B>Note:</B> if the wind is blowing to the north, <I>psi_w</I> should be equal to <I>pi</I> rad!
<H3>Inputsignal (scalar)</H3>
<PRE> psi: heading of the aircraft [rad].
</PRE>
<H3>Outputvector</H3>
<PRE> ywind = [uw vw ww]'
uw : wind velocity component along XB-axis [m/s]
vw : wind velocity component along YB-axis [m/s]
ww : wind velocity component along ZB-axis [m/s] (by default:
ww = 0)
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