Dave Perry wrote (but never attached the file):
David Megginson writes:
> Monday evening I updated SimGear, the source, and data from cvs. The
> dc3.xml file in Aicraft-yasim was changed for the worse (IMHO).
I'll be happy to put it back to what it was, but it might be better if
you could spend a little time fiddling with the XML file so that the
plane handles more correctly. I don't spend enough time with the
plane any more to get a good feel for its flying, and I'll be happy to
check in any reasonable changes.
David,
Here is a dc3.xml file that allows acceleration on the mains, reasonable
wheel landings or touch-n-goes but will still ground loop without
careful rudder use. I also did power-on and power-off stalls and the
rudder picks up the wing that drops and when the elevator is released,
the stall recovery is quick. Try it out. If it seem reasonable, check
it into cvs
By the way, do you know if the wing twist is to address wash out? If
so, who should I give feedback to as I think the twist does not wash out
both wings.
Thanks,
Dave Perry
<airplane mass="16865">
<approach speed="58" aoa="13">
<control-setting axis="/controls/engines/engine[0]/throttle" value="0.4"/>
<control-setting axis="/controls/engines/engine[1]/throttle" value="0.4"/>
<control-setting axis="/controls/engines/engine[0]/mixture" value="1.0"/>
<control-setting axis="/controls/engines/engine[1]/mixture" value="1.0"/>
<control-setting axis="/controls/engines/engine[0]/propeller-pitch" value="0.5"/>
<control-setting axis="/controls/engines/engine[1]/propeller-pitch" value="0.5"/>
<control-setting axis="/controls/flight/flaps" value="1.0"/>
<control-setting axis="/controls/gear/gear-down" value="1"/>
</approach>
<cruise speed="180" alt="23200">
<control-setting axis="/controls/engines/engine[0]/throttle" value="1.0"/>
<control-setting axis="/controls/engines/engine[1]/throttle" value="1.0"/>
<control-setting axis="/controls/engines/engine[0]/mixture" value="1.0"/>
<control-setting axis="/controls/engines/engine[1]/mixture" value="1.0"/>
<control-setting axis="/controls/engines/engine[0]/propeller-pitch" value="1.0"/>
<control-setting axis="/controls/engines/engine[1]/propeller-pitch" value="1.0"/>
<control-setting axis="/controls/engines/engine[0]/boost" value="1.0"/>
<control-setting axis="/controls/engines/engine[1]/boost" value="1.0"/>
<control-setting axis="/controls/flight/flaps" value="0.0"/>
<control-setting axis="/controls/gear/gear-down" value="0"/>
</cruise>
<cockpit x="-1.63" y="0.41" z="0.76"/>
<fuselage ax="0" ay="0" az="0" bx="-19.75" by="0" bz="0"
width="2" taper="0.5" midpoint="0.25"/>
<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" twist="0">
<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/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-output control="FLAP0" prop="/surface-positions/flap-pos-norm"/>
<control-output control="FLAP1" side="left"
prop="/surface-positions/left-aileron-pos-norm"/>
<control-output control="FLAP1" side="right"
prop="/surface-positions/right-aileron-pos-norm"/>
<control-speed control="FLAP0" transition-time="5"/>
</wing>
<hstab x="-18.12" y="0.41" z="0.27" length="4.1" effectiveness="3"
chord="3" taper=".545" sweep="15">
<stall aoa="18" width="3" peak="1.5"/>
<flap0 start="0" end="1" lift="1.5" drag="1.2"/>
<control-input axis="/controls/flight/elevator" control="FLAP0" effectiveness="1.5"/>
<control-input axis="/controls/flight/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" 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/flight/rudder" control="FLAP0" effectiveness="1.25" invert="true"/>
<control-input axis="/controls/flight/rudder-trim" control="FLAP0" invert="true"/>
<control-output control="FLAP0" prop="/surface-positions/rudder-pos-norm"/>
</vstab>
<propeller x="-4.09" y="2.52" z="-0.95"
mass="2000" moment="35" radius="1.4"
eng-power="1200" eng-rpm="2700"
turbo-mul="1.5"
cruise-power="660" cruise-speed="195"
cruise-rpm="2100" cruise-alt="20000"
min-rpm="1600" max-rpm="2700">
<actionpt x="-2.45" y="2.52" z="-0.95"/>
<control-input axis="/controls/engines/engine[0]/throttle" control="THROTTLE"/>
<control-input axis="/controls/engines/engine[0]/starter" control="STARTER"/>
<control-input axis="/controls/engines/engine[0]/magnetos" control="MAGNETOS"/>
<control-input axis="/controls/engines/engine[0]/mixture" control="MIXTURE"/>
<control-input axis="/controls/engines/engine[0]/propeller-pitch" control="ADVANCE"/>
<control-input axis="/controls/engines/engine[0]/boost" control="BOOST"/>
</propeller>
<propeller x="-4.09" y="-2.52" z="-0.95"
mass="2000" moment="-35" radius="1.4"
eng-power="1200" eng-rpm="2700"
turbo-mul="1.5"
cruise-power="660" cruise-speed="195"
cruise-rpm="2100" cruise-alt="20000"
min-rpm="1600" max-rpm="2700">
<actionpt x="-2.45" y="-2.52" z="-0.95"/>
<control-input axis="/controls/engines/engine[1]/throttle" control="THROTTLE"/>
<control-input axis="/controls/engines/engine[1]/starter" control="STARTER"/>
<control-input axis="/controls/engines/engine[1]/magnetos" control="MAGNETOS"/>
<control-input axis="/controls/engines/engine[1]/mixture" control="MIXTURE"/>
<control-input axis="/controls/engines/engine[1]/propeller-pitch" control="ADVANCE"/>
<control-input axis="/controls/engines/engine[1]/boost" control="BOOST"/>
</propeller>
<!-- Tail wheel; has castering selectable by a wheel lock -->
<gear x="-17.3" y="0" z="-0.9" compression="0.2">
<control-input axis="/controls/gear/tailwheel-lock" control="CASTERING"/>
</gear>
<gear x="-6.08" y="2.52" z="-3.49" compression="1" retract-time="7" spring="2">
<control-input axis="/controls/gear/parking-brake" control="BRAKE"/>
<control-input axis="/controls/gear/wheel[0]/brake" control="BRAKE"/>
<control-input axis="/controls/gear/gear-down" control="EXTEND"/>
<control-speed control="EXTEND" transition-time="7"/>
<control-output control="EXTEND" prop="/gear/gear[0]/position-norm"/>
</gear>
<gear x="-6.08" y="-2.52" z="-3.49" compression="1" retract-time="7" spring="2">
<control-input axis="/controls/gear/parking-brake" control="BRAKE"/>
<control-input axis="/controls/gear/wheel[1]/brake" control="BRAKE"/>
<control-input axis="/controls/gear/gear-down" control="EXTEND"/>
<control-speed control="EXTEND" transition-time="7"/>
<control-output control="EXTEND" prop="/gear/gear[1]/position-norm"/>
</gear>
<!-- From the type certificate: "Fuel capacity: 822 gals. (4 tanks in
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="-2900"/> <!-- move CG forward -->
</airplane>
_______________________________________________
Flightgear-devel mailing list
[EMAIL PROTECTED]
http://mail.flightgear.org/mailman/listinfo/flightgear-devel
