A10 yasim readme.

This is not an authentic representation of an A10 but it's based
on the right numbers, where I could find or was told them (thanks
to those who offered advice and data), and then hacked to be
flyable.  The hstab Stall AoA seems high, to me, and the whole
config seems too finely balanced.  It's likely to tip up if the
brakes are used whilst standing and facing up any appreciable
slope.

I've set up two models and configs: one to represent a 'clean'
configuration (cl) and one with an unlikely but feasible weapon
load (wl) - 16 x AGM65 + 2 x AIM9.  I didn't find a weight for
the AIM9 but I think I've seen a picture of someone standing with
one on his shoulder and so allowed 200lb for each one.  The wl
model is therefore 16 x 485lb + 2 x 200lb heavier than the cl
model with the extra weight being located via 'ballast' entries.
Extra fuselage objects have been added to represent the missiles.

I mapped the 'd' (100) and 'f' (102) keys in my keyboard.xml to
retract and extend the spoiler, which is linked to the split
aileron airbrakes.  The entries I added to my keyboard.xml are

 <key n="100">
  <name>d</name>
  <desc>Decrease Spoilers.</desc>
  <binding>
   <command>property-adjust</command>
   <property>/controls/flight/spoilers</property>
   <step type="double">-0.34</step>
  </binding>
 </key>

 <key n="102">
  <name>f</name>
  <desc>Increase Spoilers.</desc>
  <binding>
   <command>property-adjust</command>
   <property>/controls/flight/spoilers</property>
   <step type="double">0.34</step>
  </binding>
 </key>

I haven't figured how to set limits on the spoiler so pressing
'f' four times will still only extend the airbrakes through
their three positions.  However, if you then press 'd' once,
there will appear to be no effect.  Pressing 'd' once more will
start to retract the airbrakes and two more presses will
complete the retraction.  Similarly, if the spoilers are already
retracted and 'd' is pressed, nothing will appear to happen and
you will need to press 'f' twice to extend the airbrakes to their
first position.

I'd no idea what a feasible drag figure for the airbrake would be.
I've used a figure of 20, which seems high to me, but it has less
effect than I think it should have.

The parking brake will open the cockpit canopy, which is a hacked
'gear' entry:)

The model was originally constructed in Realsoft3D (linux beta
V4.5) and then exported as .3ds.

The a10cl-yasim-set.xml and a10wl-yasim-set files include
references to the a4-sound.xml, c310-vfr-panel.xml and
c310-mini-panel.xml files.  Some of the features of the panels
are not used, or used incorrectly.

The autopilot is quite aggressive and can cause elevator
'hunting' at low speeds < approx 230 asi.  This is because it
didn't seem to hold altitude very accurately unless I set it so.

Take off cannot be performed on auto pilot unless the elevator
adjustment factor is increased to damp out oscillation.
---
Files included:

/Aircraft/a10cl-yasim-set.xml
/Aircraft/a10wl-yasim-set.xml

/Aircraft/a10/A10cl.3ds
/Aircraft/a10/A10wl.3ds
/Aircraft/a10/a10cl-model.xml
/Aircraft/a10/a10wl-model.xml
/Aircraft/a10/a10-readme.txt (this file)

/Aircraft-yasim/a10cl-yasim.xml
/Aircraft-yasim/a10wl-yasim.xml
---
I found a performance curve graph for the A10 in clean configuration
and it showed max speeds of 275 knots at 45000ft and 398 knots at 1200
ft, so I've choosen that figure to work to, along with incorporating
the mods that Andy Ross made.

There's now a 'Ferry-Load' configuration - the 'fl' version, and
two panels - a full one, which imposes a frame-rate hit on my system,
and a mini panel, which seems to run ok.

Lee Elliott.
leee-fgfs@spatial.freeserve.co.uk
