I just pushed one more commit to
http://gitorious.org/~jsd/fg/sport-model/commits/navaid-repairs
This provides IMHO a pleasing combination of simplicity, versatility,
consistency, and verisimilitude.
The main new feature is to allow the active runway to be chosen to
have a crosswind or tailwind.
====================
>From the README file:
This describes the effect of /environment/runway-wind-skew.
Setting this variable affects the choice of runway. This is
relevant in three ways:
-- It affects the selection of the runway for placement of the
aircraft during initialization, assuming an airport has been
specified but no specific runway has been specified. (This
affects the code in two places, in fg_init.cxx and main.cxx.)
-- It affects what ATIS says is the runway-in-use.
-- It affects which end of a reversible ILS will be active.
The specific effect works like this: Suppose the wind at the airport
is coming from the direction WWW, and suppose the value of
runway-wind-skew is RWS. Then we /pretend/ the wind is coming from
WWW+RWS and choose the runway accordingly. A value of RWS that is
positive (but less than 180) mean the runway will be to the right of
the actual wind WWW, which increases the chance that you will have a
crosswind from your left when using the chosen runway. Assuming
there is some nonzero wind, and the wind doesn't shift:
++ Setting RWS=90 guarantees a crosswind component from the left.
++ Setting RWS=-90 guarantees a crosswind component from the right.
++ Setting RWS=180 guarantees a tailwind component.
Some examples: Suppose the airport provides runways 4/22 and 16/34,
all of which are similar in length and width. Suppose the actual wind
is coming straight out of the north.
*) RWS greater than -80 and less than 10
Runway 34, crosswind from the right
*) RWS greater than 10 and less than 100
Runway 4, crosswind from the left
*) RWS greater than 100 and less than 190
Runway 16, crosswind from the left
*) RWS greater than -170 and less than -80
Runway 22, crosswind from the right
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