From 2a4d95ed15d5db644f16d19b654fe851e5b06e40 Mon Sep 17 00:00:00 2001
From: aross <aross>
Date: Wed, 28 Aug 2002 17:02:38 +0000
Subject: [PATCH] Lots of configuration work from Dave Perry.  Moving the C.G.
 forward makes ground handling more realistic -- the tail comes off earlier
 due to stability effects, and the extra aerodynamic stability (and the
 extended rudder arm) makes the aircraft more controllable and less likely to
 ground loop.

---
 Aircraft-yasim/dc3.xml | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/Aircraft-yasim/dc3.xml b/Aircraft-yasim/dc3.xml
index f2c140ab0..27fc37ea9 100644
--- a/Aircraft-yasim/dc3.xml
+++ b/Aircraft-yasim/dc3.xml
@@ -30,7 +30,7 @@
 
 <wing x="-7.02" y="1.09" z="0.95" length="11.58" camber="0.1"
       chord="4.77" taper=".286" sweep="19" dihedral="4">
-  <stall aoa="14" width="3" peak="1.5"/>
+  <stall aoa="14" width="6" peak="1.5"/>
   <flap0 start="0.04" end="0.38" lift="1.5" drag="1.2"/>
   <flap1 start="0.38" end="0.97" lift="1.2" drag="1.2"/>
   <control-input axis="/controls/flaps" control="FLAP0"/>
@@ -44,20 +44,20 @@
   <control-speed control="FLAP0" transition-time="5"/>
 </wing>
 
-<hstab x="-18.12" y="0.41" z="0.27" length="3"
+<hstab x="-18.12" y="0.41" z="0.27" length="3.5" effectiveness="2.00"
        chord="3" taper=".545" sweep="15">
-  <stall aoa="14" width="3" peak="1.5"/>
+  <stall aoa="18" width="3" peak="1.5"/>
   <flap0 start="0" end="1" lift="1.5" drag="1.2"/>
-  <control-input axis="/controls/elevator" control="FLAP0"/>
+  <control-input axis="/controls/elevator" control="FLAP0" effectiveness="1.25"/>
   <control-input axis="/controls/elevator-trim" control="FLAP0"/>
   <control-output control="FLAP0" prop="/surface-positions/elevator-pos-norm"/>
 </hstab>
 
-<vstab x="-18.12" y="0" z="0.95" length="2.72"
+<vstab x="-18.12" y="0" z="0.95" length="2.72" effectiveness="1.25"
        chord="3.95" taper=".462" sweep="2">
   <stall aoa="14" width="3" peak="1.5"/>
   <flap0 start="0" end="1" lift="1.5" drag="1.2"/>
-  <control-input axis="/controls/rudder" control="FLAP0" invert="true"/>
+  <control-input axis="/controls/rudder" control="FLAP0" effectiveness="1.25" invert="true"/>
   <control-input axis="/controls/rudder-trim" control="FLAP0" invert="true"/>
   <control-output control="FLAP0" prop="/surface-positions/rudder-pos-norm"/>
 </vstab>
@@ -104,8 +104,8 @@
 <gear x="-6.08" y="2.52" z="-3.49" compression="1" retract-time="7">
   <control-input axis="/controls/parking-brake" control="BRAKE"/>
   <control-input axis="/controls/brakes[0]" control="BRAKE"/>
-  <control-input axis="/controls/rudder" control="BRAKE" square="1"
-	         src0="-1" src1="1" dst0="0.5" dst1="-0.5"/>
+<!--  <control-input axis="/controls/rudder" control="BRAKE" square="1"
+	         src0="-1" src1="1" dst0="0.5" dst1="-0.5"/> -->
   <control-input axis="/controls/gear-down" control="EXTEND"/>
   <control-speed control="EXTEND" transition-time="7"/>
   <control-output control="EXTEND" prop="/gear/gear[0]/position-norm"/>
@@ -114,8 +114,8 @@
 <gear x="-6.08" y="-2.52" z="-3.49" compression="1" retract-time="7">
   <control-input axis="/controls/parking-brake" control="BRAKE"/>
   <control-input axis="/controls/brakes[1]" control="BRAKE"/>
-  <control-input axis="/controls/rudder" control="BRAKE" square="1"
-                 src0="-1" src1="1" dst0="-0.5" dst1="0.5"/>
+<!--  <control-input axis="/controls/rudder" control="BRAKE" square="1"
+                 src0="-1" src1="1" dst0="-0.5" dst1="0.5"/> -->
   <control-input axis="/controls/gear-down" control="EXTEND"/>
   <control-speed control="EXTEND" transition-time="7"/>
   <control-output control="EXTEND" prop="/gear/gear[1]/position-norm"/>
@@ -125,5 +125,6 @@
      center section wing: 2 main including fuel system 210 gals. each
      (+48) and 2 aux. 201 gals. each (+83.5)" -->
 <tank x="-7.02" y="0" z="0.95" capacity="4932"/>
+<ballast x="-18.0" y="0.0" z="0.6" mass="-2800"/> <!-- move CG forward -->
 
 </airplane>