>From: Josh Babcock <[EMAIL PROTECTED]>
>
>dene maxwell wrote:
> > Hi
> > I'm trying to get an xml animation going for AI taildraggers, as the AI
>FDM
> > doesn't seem to cater for this. I have copied the rotate animation
>example
> > from the Model-HowTo;
> >
> > <!-- ***** TailDragger ***** -->
> > <animation>
> > <type>rotate</type>
> >
><property>/ai/models/aircraft/velocities/true-airspeed-kt</property>
> > <factor>1</factor>
> > <offset>1</offset>
> > <min>0.0</min>
> > <max>13.0</max>
> > <center>
> > <x-m>2</x-m>
> > <y-m>0</y-m>
> > <z-m>-1.5</z-m>
> > </center>
> > <axis>
> > <x>0</x>
> > <y>1</y>
> > <z>0</z>
> > </axis>
> > <!--
> > <condition>
> > <less-than>
> >
><property>/ai/models/aircraft/velocities/true-airspeed-kt</property>
> > <value>30</value>
> > </less-than>
> > </condition>
> > -->
> > </animation>
> >
> > but the min and max values don't have any effect... the plane rotates
>about
> > the wheels as the speed varies...to the extent at 180 knots it's flying
> > backwards and upside down ...very amusing first time but now just
> > frustrating...
> >
> > ...what am I doing wrong in this animation?
> >
> > TIA
> > :-D ene
> >
> > _________________________________________________________________
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> >
> >
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> >
>
>What you have will rise from 0 up to 13 as the airspeed rises from -1 up
>to 12, then stay at 13 as the airspeed keeps on rising. To fix this,
>make factor 1/n where n is the airspeed that you want the rotation to be
>13. You probably also want offset to be 0, but I'm not sure exactly what
>you are doing. Think of it as a graph of Y=aX+b Y is your rotation, X is
>the airspeed, b is the offset, and a is the factor. It might help to
>actually draw the graph.
>
>Josh
>
Oh ...I know the factors are all wrong at the moment, but the problem is the
min and max aren't limiting the degree of moment... I would be quite happy
at this stage to get the tail up @0ktas then falling at a predetermined
level but at the moment there are no limits on the rotation despite the min
and max
I know that factor will determine the gradient of the transition, what I
want is (typical taildragger behaviour) at a predetermined speed (say
50knts) the tail to rise (assuming acceleration) to normal flying attitude
(ie 0 degrees).... the x-y graph would look like;
Tail
Elevation
|-----------------Tail down (13*)
| \
| \
| \------------------Tail up (0*)
|________+__+_________________
Vmin Vmax
Velocity->
but I need the min/max to work for this....
:-D ene
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