On Mon, 2007-04-02 at 13:45 +0100, Nick Warne wrote:
> Hi all,
>
> Helping Vivian today on the Spitfire model, the gear warning (stall) klaxon
> wasn't working for me [again] although Vivian had fixed the previous issue
> why it failed sometimes.
>
> After investigation, it turns out one of the conditions required for the
> stall
> warning to go off is:
>
> <equals>
> <property>controls/engines/engine/throttle</property>
> <value>0</value>
> </equals>
>
> It turns out I calibrated my JS using JSCAL, and the throttle axis ran
> from -32766 <-> 32767.
>
> Thus, when my throttle was off, FG actually reports it as (similar):
>
> 1.598490389232043e -5
>
> so it isn't '0', and therefore klaxon criteria wasn't met.
>
> Hand 'tweaking' my jscal file, I have now got my JS to report -32767 <->
> 32767
> on all axis, and now FG does show throttle to be 1 <-> 0 at the ends of the
> range.
>
> So, how accurate does the throttle need to be? Surely not 1.5e -5?
>
> Nick
You probably should change the condition to not depend on a perfectly
rigged joystick. Testing for equal is not a great idea any time you are
using floating point math... This is the gear warning out of the
c182rg:
<gear-horn>
<name>gear-horn</name>
<mode>looped</mode>
<path>Aircraft/c182rg/Sounds/stall-600-chopped.wav</path>
<condition>
<and>
<less-than>
<property>controls/engines/engine/throttle</property>
<value>0.3</value>
</less-than>
<equals>
<property>controls/gear/gear-handle-down</property>
<value>0</value>
</equals>
</and>
</condition>
</gear-horn>
As you can see, it only needs the throttle to be less than 30%. Try
something like this for the spitfire:
<condition>
<and>
<less-than>
<property>controls/engines/engine/throttle</property>
<value>0.2</value>
</less-than>
<equals>
<property>controls/gear/gear-down</property>
<value>0</value>
</equals>
<equals>
<property>sim/alarms/gear-warn</property>
<value>0</value>
</equals>
</and>
</condition>
Ron
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