ad052ca1c3
Try the following patch to c172.xml, which makes the takeoff-rpm modification I talked about*. Hopefully things will be more to your liking; the aircraft maxes out at 2100 RPM while stopped, then the speed increases to something more like cruise as the airspeed grows. If you look carefully, you'll actually see the RPM drop very slightly before it starts increasing. The physical reason for this is that the blades are "unstalling". As the flow attaches to them, they experience a sharp increase in induced drag. I was pretty pleased to notice this little tidbit; it kinda validates the model in an obtuse way. That being said, I have *no* idea if this effect is noticeable in a real aircraft. Alex?
91 lines
No EOL
3.7 KiB
XML
91 lines
No EOL
3.7 KiB
XML
<airplane mass="1950">
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<!-- Approach configuration -->
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<approach speed="47" aoa="16">
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<control-setting axis="/controls/throttle[0]" value="0.3"/>
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<control-setting axis="/controls/mixture[0]" value="1.0"/>
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<control-setting axis="/controls/flaps" value="1.0"/>
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</approach>
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<!-- Cruise configuration -->
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<cruise speed="123" alt="0">
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<control-setting axis="/controls/throttle[0]" value="1.0"/>
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<control-setting axis="/controls/mixture[0]" value="1.0"/>
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<control-setting axis="/controls/flaps" value="0.0"/>
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</cruise>
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<cockpit x="-1.88" y=".33" z="0.6"/>
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<fuselage ax="-.17" ay="0" az="-.51" bx="-7.16" by="0" bz=".17"
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width="1.5" taper="0.2" midpoint="0.3"/>
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<wing x="-2.47" y=".51" z=".68" taper=".78"
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length="5.37" chord="1.54" sweep="0" dihedral="0" camber="0.1">
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<stall aoa="16" width="6" peak="1.5"/>
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<flap0 start="0" end=".38" lift="1.6" drag="2.0"/>
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<flap1 start=".78" end="1" lift="1.5" drag="1.6"/>
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<control-input axis="/controls/flaps" control="FLAP0"/>
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<control-input axis="/controls/aileron" control="FLAP1" split="true"/>
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<control-input axis="/controls/aileron-trim" control="FLAP1" split="true"/>
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<control-output control="FLAP0" prop="/surface-positions/flap-pos-norm"/>
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<control-output control="FLAP1" side="left"
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prop="/surface-positions/left-aileron-pos-norm"/>
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<control-output control="FLAP1" side="right"
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prop="/surface-positions/right-aileron-pos-norm"/>
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<control-speed control="FLAP0" transition-time="6"/>
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</wing>
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<hstab x="-7.16" y="0.08" z=".17" taper=".63"
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length="1.71" chord="1.36" sweep="0">
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<stall aoa="16" width="4" peak="1.5"/>
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<flap0 start="0" end="1" lift="1.6" drag="1.8"/>
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<control-input axis="/controls/elevator" control="FLAP0"/>
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<control-input axis="/controls/elevator-trim" control="FLAP0"/>
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<control-output control="FLAP0" prop="/surface-positions/elevator-pos-norm"/>
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</hstab>
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<vstab x="-7.16" y="0" z=".17" taper=".5"
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length="1.71" chord="1.54" sweep="20">
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<stall aoa="16" width="4" peak="1.5"/>
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<flap0 start="0" end="1" lift="1.3" drag="1.5"/>
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<control-input axis="/controls/rudder" control="FLAP0" invert="true"/>
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<control-input axis="/controls/rudder-trim" control="FLAP0" invert="true"/>
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<control-output control="FLAP0" prop="/surface-positions/rudder-pos-norm"
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min="1" max="-1"/>
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</vstab>
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<propeller radius="1.0"
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cruise-speed="86" cruise-rpm="2200"
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cruise-alt="10000" cruise-power="99"
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takeoff-power="134.5" takeoff-rpm="2100"
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eng-power="160" eng-rpm="2500"
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x="-.6" y="0" z="0" mass="400" moment="8">
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<actionpt x="0" y="0" z="0"/>
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<control-input axis="/controls/throttle[0]" control="THROTTLE"/>
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<control-input axis="/controls/starter[0]" control="STARTER"/>
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<control-input axis="/controls/magnetos[0]" control="MAGNETOS"/>
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<control-input axis="/controls/mixture[0]" control="MIXTURE"/>
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</propeller>
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<gear x="-1" y="0" z="-1.5" compression=".4"> <!-- nose -->
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<control-input axis="/controls/rudder" control="STEER"/>
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</gear>
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<gear x="-2.82" y="1.15" z="-1.36" compression=".3"> <!-- left main -->
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<control-input axis="/controls/brakes[0]" control="BRAKE" split="true"/>
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<control-input axis="/controls/parking-brake" control="BRAKE" split="true"/>
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</gear>
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<gear x="-2.82" y="-1.15" z="-1.36" compression=".3"> <!-- left main -->
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<control-input axis="/controls/brakes[1]" control="BRAKE" split="true"/>
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<control-input axis="/controls/parking-brake" control="BRAKE" split="true"/>
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</gear>
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<tank x="-2.47" y="1.36" z=".68" capacity="75"/>
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<tank x="-2.47" y="-1.36" z=".68" capacity="75"/>
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<ballast x="-2.0" y=".33" z="0" mass="180"/> <!-- pilot -->
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<ballast x="-2.0" y="-.33" z="0" mass="180"/> <!-- passenger -->
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<ballast x="-1.0" y="-.33" z="0" mass="200"/> <!-- cockpit -->
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</airplane> |