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Lee Elliott:

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I've been messing with the yf23 some more.  I think it flies a bit better now
and has more reasonable auto-pilot take-off characteristics - just apply full
power and go, and it doesn't go into such a steep climb.

Out of curiosity, I've also taken the rudder control input and linked it to
the stabilators/elevators and ailerons.  Now, with some slick joystick
manipulation it's possible to fly it at about 30 deg off-axis in more or less
level flight (actually, with full 'rudder' input, it looks nearer to 40 deg
to me and you end up tracing a very long curve).

If no rudder input is used it flies 'normally'.

I'd like to be able to 'tune' it so that it's more stable while transitioning
but I'm not sure if that's going to be possible.  It's also high-lighted some
problems I'm having with my Sidewinder joystick - when I use the rudder
control, the engine No.2 throttle jumps to 50% unless auto-throttle is
engaged (this also happens with the b52 too), and there seems to be some
interaction between the different axis if all three (roll, pitch and rudder)
are changed at the same time - difficult to be sure on that one though.

I'll probably un-map the throttle control from the joystick as I tend to use
the keyboard for engine control anyway, especially for landing.
This commit is contained in:
curt 2003-06-04 17:54:08 +00:00
parent 15921c254f
commit 9b1e230b87
2 changed files with 35 additions and 30 deletions
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53
Aircraft-yasim/yf23-yasim.xml
View file

@ -38,9 +38,7 @@
<cockpit x="5.70" y="0.00" z="1.26"/>
<!-- Fuselage entries for the fuselage proper and the two
engine housings. The YF23 is basically a wing with
these three fuselage/housings, and the elevator. For
this reason I've started the wings from the center-line.
engine housings.
-->
<!-- Fuselage -->
<fuselage ax="10.00" ay="0.00" az="0.00"
@ -48,38 +46,41 @@
width="1.6" taper="0.5" midpoint="0.5"/>
<!-- Left engine housing -->
<fuselage ax="-2.00" ay="1.80" az="0.00"
bx="-8.00" by="1.20" bz="0.60"
width="1.2" taper="0" midpoint="0.3"/>
<!-- Right engine housing -->
<fuselage ax="-2.00" ay="-1.80" az="0.00"
bx="-8.00" by="-1.20" bz="0.60"
width="1.2" taper="0" midpoint="0.3"/>
<!-- GW stall characteristics -->
<!--
<!-- Lots of guesswork here -->
<wing x="-2.00" y="0.00" z="0.25" length="6.66" chord="12.00"
taper="0.08" sweep="0" dihedral="0" camber="0" incidence="-0.4">
<stall aoa="35" width="3" peak="1.3"/>
<flap0 start="0.36" end="0.63" lift="1.1" drag="1.8"/>
<flap1 start="0.63" end="0.89" lift="1.1" drag="1.3"/>
taper="0.08" sweep="0" dihedral="0" camber="0.01" incidence="0.0">
<stall aoa="35" width="2" peak="1.3"/>
<flap0 start="0.36" end="0.63" lift="1.5" drag="1.6"/>
<flap1 start="0.63" end="0.89" lift="1.05" drag="1.3"/>
<slat start="0.42" end="0.89" aoa="3" drag="1.1"/>
-->
<!-- Shortened wing that starts outboard of the engine intakes
<wing x="-2.00" y="2.40" z="0.25" length="4.2" chord="8.1"
taper="0.19" sweep="0" dihedral="0" camber="0.0" incidence="0.0">
<stall aoa="35" width="3" peak="1.3"/>
<flap0 start="0.0" end="0.42" lift="1.5" drag="1.5"/>
<flap1 start="0.42" end="0.833" lift="1.1" drag="1.3"/>
<stall aoa="35" width="2" peak="1.3"/>
<flap0 start="0.0" end="0.42" lift="1.5" drag="1.6"/>
<flap1 start="0.42" end="0.833" lift="1.05" drag="1.3"/>
<slat start="0.14" end="0.833" aoa="3" drag="1.1"/>
-->
<control-input axis="/controls/flight/flaps" control="FLAP0"/>
<control-input axis="/controls/flight/aileron" control="FLAP1" split="true"/>
<control-input axis="/controls/flight/aileron-trim" control="FLAP1" split="true"/>
<control-input axis="/controls/flight/slats" control="SLAT"/>
<control-output control="FLAP0" prop="/surface-positions/flap-pos-norm"/>
<control-input axis="/controls/flight/rudder" control="FLAP1" split="true" square="false"/>
<control-output control="FLAP0" prop="/surface-positions/left-flap-pos-norm"/>
<control-output control="FLAP0" prop="/surface-positions/right-flap-pos-norm"/>
<control-output control="FLAP1" side="left"
prop="/surface-positions/left-aileron-pos-norm"/>
<control-output control="FLAP1" side="right"
@ -92,23 +93,27 @@
</wing>
<hstab x="-8.70" y="2.40" z="0.36" length="3.30" chord="5.10"
taper="0.11" sweep="0" dihedral="40" camber="0.0" effectiveness="1">
<stall aoa="24" width="7" peak="1.3"/>
<flap0 start="0" end="1" lift="1.4" drag="1.5"/>
taper="0.11" sweep="0" dihedral="40" camber="0.01" effectiveness="1">
<stall aoa="24" width="2" peak="1.3"/>
<flap0 start="0" end="1" lift="1.8" drag="1.6"/>
<control-input axis="/controls/flight/elevator" control="FLAP0"/>
<control-input axis="/controls/flight/elevator-trim" control="FLAP0"/>
<control-output control="FLAP0" prop="/surface-positions/elevator-pos-norm"/>
<control-input axis="/controls/flight/rudder" control="FLAP0" split="true" square="false"/>
<control-output control="FLAP0" side="left" prop="/surface-positions/left-elevator-pos-norm"/>
<control-output control="FLAP0" side="right" prop="/surface-positions/right-elevator-pos-norm"/>
<control-speed control="FLAP0" transition-time="0.5"/>
</hstab>
<!-- The only figures I've found for the F119-PW-100L give 35000lb
'class' with afterburner. The difference between the top speed
with and with out afterburner (mach 1.43 vs mach 2) suggests that
the afterburner ratio is << 2:1 so I've used a ratio suggested by
those mach speeds + plus a fudge factor = 0.7. Also, the engine has
thrust vectoring but I've not worked that out yet.
those mach speeds + plus a fudge factor = 0.7.
-->
<jet x="-6.26" y="1.20" z="0.60" mass="3000" thrust="24500" afterburner="35000">
<control-input axis="/controls/engines/engine[0]/throttle" control="THROTTLE"/>
@ -152,7 +157,7 @@
<control-output control="EXTEND" prop="/canopy/position-norm"/>
</gear>
<!-- The locations and capcities are GW. -->
<!-- The locations and capcities are guesswork. -->
<!-- Fuselage tank -->
<tank x="1.5" y="0" z="0.68" jet="true" capacity="8000"/>
<!-- Left wing tank -->
@ -170,6 +175,6 @@
<ballast x="5.8" y="0" z="0.6" mass="200"/>
<!-- Trim ballast -->
<ballast x="6" y="0" z="0.0" mass="1000"/>
<ballast x="6" y="0" z="0.0" mass="2000"/>
</airplane>

12
Aircraft/yf23-yasim-set.xml
View file

@ -50,7 +50,7 @@ NR/MD YF23 simulation config.
</sim>
<controls>
<!-- <controls>
<engines>
<engine n="0">
<magnetos>3</magnetos>
@ -60,7 +60,7 @@ NR/MD YF23 simulation config.
</engine>
</engines>
</controls>
-->
<autopilot>
<config>
@ -70,15 +70,15 @@ NR/MD YF23 simulation config.
<target-climb-rate-fpm type="float">20000.0</target-climb-rate-fpm>
<target-descent-rate-fpm type="float">12000.0</target-descent-rate-fpm>
<elevator-adj-factor type="float">130.0</elevator-adj-factor>
<elevator-adj-factor type="float">500.0</elevator-adj-factor>
<integral-contribution type="float">0.005</integral-contribution>
<max-aileron type="float">0.5</max-aileron>
<max-aileron type="float">0.6</max-aileron>
<max-roll-deg type="float">60.0</max-roll-deg>
<roll-out-deg type="float">10.0</roll-out-deg>
<roll-out-smooth-deg type="float">20.0</roll-out-smooth-deg>
<roll-out-deg type="float">7.0</roll-out-deg>
<roll-out-smooth-deg type="float">15.0</roll-out-smooth-deg>
<zero-pitch-throttle type="float">0.5</zero-pitch-throttle>
<zero-pitch-trim-full-throttle type="float">0.001</zero-pitch-trim-full-throttle>