YASim aero model for a Piper J3 Cub.
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Aircraft-yasim/j3cub.xml
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Aircraft-yasim/j3cub.xml
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<?xml version="1.0"?>
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<!--
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************************************************************************
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YASim aerodynamic model for a Piper J3 Cub.
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Started 2002-08-15 by David Megginson.
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This aerodynamic model is based on three-views, unauthoritative
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performance data, and wild guesses. These sites provided particularly
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useful information or were simply fun to visit:
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Performance data:
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http://www.marss.com/cub.htm
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Weight and balance:
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http://www.danford.net/balance.htm
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Three-view:
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http://www.fiddlersgreen.net/aircraft/private/j3cub/j3cub_info/j3_info.htm
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Useless but fun free paper model:
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http://www.fiddlersgreen.net/aircraft/private/j3cub/j3cub.htm
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Useless but fun 1945 Piper Cub add from FLYING:
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http://www.fiddlersgreen.net/aircraft/private/j3cub/j3cub_info/piperad.jpg
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The reference datum for measurements is the leading edge of the wing,
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since it is what the weight-and-balance site above uses.
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************************************************************************
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-->
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<!--
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680lb empty weight less 200lb for engine (wild guess)
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+ 340 for pilot and passenger
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-->
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<airplane mass="820">
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<!-- Approach configuration (actually touchdown, I think) -->
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<approach speed="25" 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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</approach>
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<!-- Cruise configuration -->
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<cruise speed="67" alt="8000">
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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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</cruise>
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<!-- pilot's eyepoint -->
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<cockpit x="-0.23" y="0" z="-0.30"/>
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<!-- FIXME: midpoint (I don't understand it) -->
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<!-- FIXME: taper (I just left in the C172 value) -->
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<fuselage ax="1.37" ay="0" az="-0.71" bx="-4.81" by="0" bz="-0.65"
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width="0.71" taper="0.16" midpoint="0.83"/>
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<!--
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I treat it as a perfectly rectangular wing for now. Note that
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the dihedral is exaggerated to simulate hull-interference effects
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on a high-wing aircraft; once YASim models that properly, the
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angle should be reduced to something like 2 degrees.
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Note that the J3 Cub has no flaps. With a stall speed of 25kt, who
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needs them? From what I've read, the ailerons add lots of drag.
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-->
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<!-- FIXME: camber (used the C172 value) -->
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<wing x="-0.80" y="0.42" z="0.0" taper="0.0"
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length="4.87" chord="1.60" sweep="0" dihedral="5" camber="0.1">
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<stall aoa="16" width="6" peak="1.5"/>
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<flap0 start=".31" end="0.85" lift="1.5" drag="1.4"/>
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<control-input axis="/controls/aileron" control="FLAP0" split="true"/>
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<control-input axis="/controls/aileron-trim" control="FLAP0" split="true"/>
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<control-output control="FLAP0" side="left"
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prop="/surface-positions/left-aileron-pos-norm"/>
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<control-output control="FLAP0" side="right"
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prop="/surface-positions/right-aileron-pos-norm"/>
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</wing>
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<!-- FIXME: taper (used the C172 value) -->
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<hstab x="-4.87" y="0.05" z="-0.42" taper="0.5"
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length="1.49" chord="1.13" sweep="0">
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<stall aoa="16" width="4" peak="1.5"/>
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<flap0 start="0" end="1" lift="1.7" drag="1.2"/>
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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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<!-- FIXME: taper (used the C172 value) -->
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<!-- rudder has to be able to counteract aileron drag -->
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<vstab x="-4.87" y="0" z="-0.65" taper="0.38"
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length="1.31" chord="1.37" sweep="0">
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<stall aoa="16" width="4" peak="1.5"/>
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<flap0 start="0" end="1" lift="1.5" drag="1.2"/>
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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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<!-- FIXME: engine mass (just a guess; it's a small engine) -->
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<!-- Assume 75% power at 8000ft -->
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<propeller radius="0.95"
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cruise-speed="60" cruise-rpm="2300"
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cruise-alt="8000" cruise-power="48"
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takeoff-power="60" takeoff-rpm="2300"
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eng-power="65" eng-rpm="2700"
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x="0.71" y="0" z="-0.65" mass="200" moment="8">
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<actionpt x="1.31" y="0" z="-0.65"/>
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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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<!-- FIXME: the J3 Cub may not actually have a tail-wheel lock -->
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<gear x="-5.17" y="0" z="-0.71" compression="0.2">
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<control-input axis="/controls/tailwheel-castering" control="CASTERING"/>
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</gear>
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<gear x="0" y="0.89" z="-1.96" 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="0" y="-0.89" z="-1.96" compression=".3"> <!-- right 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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<!-- There's just one 12-gallon tank, right behind the engine (!!!) -->
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<tank x="-0.45" y="0" z="-0.89" capacity="72"/>
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<!--
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Note the tandem seating; the x values (arms) come from the
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weight-and-balance page cited at the start.
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-->
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<ballast x="-0.23" y="0" z="-0.70" mass="170"/> <!-- pilot -->
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<ballast x="-0.91" y="0" z="-0.70" mass="170"/> <!-- passenger -->
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</airplane>
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63
Aircraft/j3cub-yasim-set.xml
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63
Aircraft/j3cub-yasim-set.xml
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<?xml version="1.0"?>
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<!--
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************************************************************************
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Piper J3 Cub simulation config. This files ties together all the components
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used by FGFS to represent the J3 Cub. Components include the flight data
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model, instrument panel, and external 3D model.
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3D models can be downloaded from http://home.t-online.de/home/Wolfram.Kuss/
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************************************************************************
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-->
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<PropertyList>
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<sim>
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<flight-model>yasim</flight-model>
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<aero>j3cub</aero>
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<fuel-fraction>0.8</fuel-fraction>
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<sound>
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<audible>true</audible>
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<path>Aircraft/c172/c172-sound.xml</path>
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</sound>
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<panel>
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<visibility archive="n">false</visibility>
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</panel>
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<model>
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<path archive="y">Aircraft/c172/Models/c172-dpm.xml</path>
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</model>
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<view>
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<internal archive="y">true</internal>
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<config>
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<x-offset-m archive="y">-0.25</x-offset-m>
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<y-offset-m archive="y">0.20</y-offset-m>
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<z-offset-m archive="y">0.66</z-offset-m>
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</config>
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</view>
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<current-view>
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<pitch-offset-deg>-13</pitch-offset-deg>
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</current-view>
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</sim>
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<controls>
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<magnetos>3</magnetos>
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</controls>
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<!-- An autopilot on a Cub??? -->
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<autopilot>
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<config>
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<min-climb-speed-kt type="float">48.0</min-climb-speed-kt>
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<best-climb-speed-kt type="float">56.0</best-climb-speed-kt>
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<target-climb-rate-fpm type="float">400.0</target-climb-rate-fpm>
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<target-descent-rate-fpm type="float">1000.0</target-descent-rate-fpm>
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<elevator-adj-factor type="float">6000.0</elevator-adj-factor>
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<integral-contribution type="float">0.008</integral-contribution>
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<zero-pitch-throttle type="float">0.35</zero-pitch-throttle>
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<zero-pitch-trim-full-throttle type="float">0.001</zero-pitch-trim-full-throttle>
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</config>
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</autopilot>
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</PropertyList>
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