276 lines
11 KiB
XML
Executable file
276 lines
11 KiB
XML
Executable file
<!-- B52-F yasim config.
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Notes.
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B-52F with full fuel load, no weapon load.
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This config cannot be regarded as an accurate representation
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of a B-52F. I've used the real numbers, where I've been able
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to find them, but a lot of this config is semi-educated
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guesswork. I think all the bits are in the right places but
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many of the numbers were obtained either by measuring a h/c
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of the 3-view I used as a template for modelling or by reading
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them out of my 3d modeller.
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I found a reference to the wing incidence, sweep (see the wing
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entry in the config) and the layout of the flaps and ailerons
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(ailerons are positioned between the two sets of flaps on each
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wing) but all the other numbers are guesswork. The X/YB52 had
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only two positions for the flaps - up or down, with the down
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position being at 35 deg. I found no references to this being
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changed in later models. In view of that, although they're
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pretty big, I've set the lift to only 1.3 and set extend time
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to 35 seconds on the basis that the attitude change as a result
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of going from full flaps to zero flaps shouldn't be too great.
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The B52s had all moving tailplanes (9 deg up & 4 deg down) and
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these cannot be represented correctly using yasim at the moment,
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so in that respect this config is definitely a hack.
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Lee Elliott. leee-fgfs@spatial.freeserve.co.uk
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-->
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<airplane mass="173599">
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<!-- Approach configuration -->
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<approach speed="100" aoa="0.5">
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<control-setting axis="/controls/engines/engine[0]/throttle" value="0.1"/>
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<control-setting axis="/controls/engines/engine[1]/throttle" value="0.1"/>
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<control-setting axis="/controls/engines/engine[2]/throttle" value="0.1"/>
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<control-setting axis="/controls/engines/engine[3]/throttle" value="0.1"/>
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<control-setting axis="/controls/engines/engine[4]/throttle" value="0.1"/>
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<control-setting axis="/controls/engines/engine[5]/throttle" value="0.1"/>
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<control-setting axis="/controls/engines/engine[6]/throttle" value="0.1"/>
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<control-setting axis="/controls/engines/engine[7]/throttle" value="0.1"/>
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<control-setting axis="/controls/flight/flaps" value="1.0"/>
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<control-setting axis="/controls/gear/gear-down" value="1"/>
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</approach>
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<!-- Cruise configuration -->
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<!-- I found figures of 554 kt @ 21000 ft (max),
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495 kt @ 46500 ft (max) and 454 kt cruise (no alt).
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I found some references that implied that the max speeds were
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limited by buffet and flutter and not by engine power i.e. an
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E model was fitted with an electronically controlled system
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designed to reduce stress on the airframe during low-level
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operations and was able to fly 10 knots faster than the speed
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at which a normal b52 would have disintegrated due to flutter.
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-->
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<cruise speed="554" alt="21000">
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<control-setting axis="/controls/engines/engine[0]/throttle" value="0.6"/>
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<control-setting axis="/controls/engines/engine[1]/throttle" value="0.6"/>
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<control-setting axis="/controls/engines/engine[2]/throttle" value="0.6"/>
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<control-setting axis="/controls/engines/engine[3]/throttle" value="0.6"/>
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<control-setting axis="/controls/engines/engine[4]/throttle" value="0.6"/>
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<control-setting axis="/controls/engines/engine[5]/throttle" value="0.6"/>
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<control-setting axis="/controls/engines/engine[6]/throttle" value="0.6"/>
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<control-setting axis="/controls/engines/engine[7]/throttle" value="0.6"/>
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<control-setting axis="/controls/flight/flaps" value="0.0"/>
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<control-setting axis="/controls/gear/gear-down" value="0"/>
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</cruise>
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<cockpit x="-2.2" y="0.0" z="2.0"/>
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<fuselage ax="0" ay="0" az="0" bx="-49.05" by="0" bz=".64"
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width="3.2" taper="0.5" midpoint="0.3"/>
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<!-- Wing incidence was set at 6 degrees because the tandem u/c meant
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that the aircraft couldn't rotate in the conventional fashion. I
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found lots of references to the sweep angle of 35 degrees but
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none of them stated the chord point for it i.e. leading edge or
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quarter-chord. As yasim uses mid-chord I've subtracted 0.5 degree
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as a fudge factor.
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Yasim also only allows for one [real] flap entry per wing so I
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specify the two separate flap sections on each wing (see Notes.
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above) with the aileron between them. Instead, I've stuck the
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aileron after the flaps and reduced their lift.
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-->
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<wing x="-16.0" y="1.6" z="1.2" taper="0.4" incidence="6"
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length="31.1" chord="10.0" sweep="34.5" dihedral="-3.0" camber="0.16">
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<stall aoa="15.0" width="2" peak="1.3"/>
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<flap0 start="0.0" end="0.7" lift="1.5" drag="1.8"/>
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<flap1 start="0.7" end="0.78" lift="1.3" drag="1.2"/>
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<spoiler start="0.5" end="0.75" lift="0.0" drag="20.0"/>
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<control-input axis="/controls/flight/flaps" control="FLAP0"/>
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<control-input axis="/controls/flight/aileron" control="FLAP1" split="true"/>
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<control-input axis="/controls/flight/spoilers" control="SPOILER"/>
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<control-output control="FLAP0" prop="/surface-positions/flap-pos-norm"/>
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<control-output control="FLAP1" side="left" prop="/surface-positions/left-aileron-pos-norm"/>
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<control-output control="FLAP1" side="right" prop="/surface-positions/right-aileron-pos-norm"/>
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<control-output control="SPOILER" side="left" prop="/surface-positions/left-spoiler-pos-norm"/>
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<control-output control="SPOILER" side="right" prop="/surface-positions/right-spoiler-pos-norm"/>
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<control-speed control="FLAP0" transition-time="35"/>
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<control-speed control="FLAP1" transition-time="0.3"/>
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<control-speed control="SPOILER" transition-time="0.5"/>
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</wing>
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<!-- The hstab/elevators are nearly deltas ao I've given them a high
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stall AoA figure.
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-->
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<hstab x="-41.5" y="1.0" z="0.8" taper="0.25" effectiveness="1.0"
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length="7.5" chord="7.5" sweep="40.0" dihedral="0.0">
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<stall aoa="25.0" width="3" 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/flight/elevator" control="FLAP0"/>
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<control-input axis="/controls/flight/elevator-trim" control="FLAP0"/>
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<control-output control="FLAP0" prop="/surface-positions/elevator-pos-norm"/>
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<control-speed control="FLAP0" transition-time="0.5"/>
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</hstab>
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<vstab x="-41.5" y="0" z="2.0" taper="0.4"
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length="8.5" chord="7.5" sweep="35.0">
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<stall aoa="20.0" width="3" peak="1.5"/>
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<flap0 start="0" end="1" lift="1.15" drag="1.3"/>
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<control-input axis="/controls/flight/rudder" control="FLAP0" invert="true"/>
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<control-output control="FLAP0" prop="/surface-positions/rudder-pos-norm"/>
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</vstab>
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<!-- Engine entries -->
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<!-- I've used the dry thrust rating of the J57-P-43WA turbojet (11200 lb)
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here instead of the wet-thrust (13500 lb). This will make take offs a
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little more sluggish but is about equivilent of a B-52B with wet-thrust.
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This model is a little heavier though.
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I couldn't find a weight for the engines and have guessed at 4000lb
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-->
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<!-- Left wing engines -->
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<!-- Left Outer Left -->
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<jet x="-23.0" y="20.0" z="-1.0"
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mass="4000"
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thrust="11200">
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<control-input axis="/controls/engines/engine[0]/throttle" control="THROTTLE"/>
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</jet>
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<!-- Left Outer Right -->
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<jet x="-23.0" y="18.0" z="-1.0"
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mass="4000"
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thrust="11200">
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<control-input axis="/controls/engines/engine[1]/throttle" control="THROTTLE"/>
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</jet>
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<!-- Left Inner Left -->
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<jet x="-15.0" y="12.0" z="-1.0"
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mass="4000"
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thrust="11200">
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<control-input axis="/controls/engines/engine[2]/throttle" control="THROTTLE"/>
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</jet>
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<!-- Left Inner Right -->
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<jet x="-15.0" y="10.0" z="-1.0"
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mass="4000"
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thrust="11200">
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<control-input axis="/controls/engines/engine[3]/throttle" control="THROTTLE"/>
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</jet>
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<!-- Right wing engines -->
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<!-- Right Inner Left -->
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<jet x="-15.0" y="-10.0" z="-1.0"
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mass="4000"
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thrust="11200">
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<control-input axis="/controls/engines/engine[4]/throttle" control="THROTTLE"/>
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</jet>
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<!-- Right Inner Right -->
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<jet x="-15.0" y="-12.0" z="-1.0"
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mass="4000"
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thrust="11200">
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<control-input axis="/controls/engines/engine[5]/throttle" control="THROTTLE"/>
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</jet>
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<!-- Right Outer Left -->
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<jet x="-23.0" y="-18.0" z="-1.0"
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mass="4000"
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thrust="11200">
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<control-input axis="/controls/engines/engine[6]/throttle" control="THROTTLE"/>
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</jet>
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<!-- Right Outer Right -->
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<jet x="-23.0" y="-20.0" z="-1.0"
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mass="4000"
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thrust="11200">
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<control-input axis="/controls/engines/engine[7]/throttle" control="THROTTLE"/>
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</jet>
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<!-- Front Left -->
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<gear x="-13.2" y="2.0" z="-2.9" retract-time="7" compression="1.0">
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<control-input axis="/controls/flight/rudder" control="STEER" square="true"/>
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<control-input axis="/controls/gear/gear-down" control="EXTEND"/>
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<control-speed control="EXTEND" transition-time="7"/>
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<control-output control="EXTEND" prop="/gear/gear/position-norm"/>
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</gear>
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<!-- Front Right -->
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<gear x="-13.2" y="-2.0" z="-2.9" retract-time="7" compression="1.0">
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<control-input axis="/controls/flight/rudder" control="STEER" square="true"/>
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<control-input axis="/controls/gear/gear-down" control="EXTEND"/>
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<control-speed control="EXTEND" transition-time="7"/>
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<control-output control="EXTEND" prop="/gear/gear/position-norm"/>
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</gear>
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<!-- Rear Left -->
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<gear x="-28.0" y="2.0" z="-2.9" retract-time="7" compression="1.0">
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<control-input axis="/controls/gear/wheel[0]/brake" control="BRAKE"/>
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<control-input axis="/controls/gear/gear-down" control="EXTEND"/>
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<control-speed control="EXTEND" transition-time="7"/>
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<control-output control="EXTEND" prop="/gear/gear/position-norm"/>
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</gear>
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<!-- Rear Right -->
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<gear x="-28.0" y="-2.0" z="-2.9" retract-time="7" compression="1.0">
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<control-input axis="/controls/gears/wheel[0]/brake" control="BRAKE"/>
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<control-input axis="/controls/gear/gear-down" control="EXTEND"/>
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<control-speed control="EXTEND" transition-time="7"/>
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<control-output control="EXTEND" prop="/gear/gear/position-norm"/>
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</gear>
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<!-- Left Wing -->
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<gear x="-31.0" y="23.0" z="-2.0" retract-time="7" compression="2.5">
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<control-input axis="/controls/gear/wheel[0]/brake" control="BRAKE"/>
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<control-input axis="/controls/gear/gear-down" control="EXTEND"/>
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<control-speed control="EXTEND" transition-time="7"/>
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<control-output control="EXTEND" prop="/gear/gear/position-norm"/>
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</gear>
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<!-- Right Wing -->
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<gear x="-31.0" y="-23.0" z="-2.0" retract-time="7" compression="2.5">
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<control-input axis="/controls/gear/wheel[1]/brake" control="BRAKE"/>
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<control-input axis="/controls/gear/gear-down" control="EXTEND"/>
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<control-speed control="EXTEND" transition-time="7"/>
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<control-output control="EXTEND" prop="/gear/gear/position-norm"/>
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</gear>
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<!-- Fuel tanks -->
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<!-- Total fuel for the F model was 41553 gal incl the external tanks
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There are a total of ten internal tanks, three located in the wings
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and four along the top of the fuselage above the bomb bay. I don't
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know what percentage was held in the wings vs. the fuselage but I'm
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guessing that more was held in the fuselage tank than half of the
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wing tank total.
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There are also two external wing tanks holding 3000 gal each.
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fgfs seems to convert gal to lbs using a ratio of 1:6 giving a total
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of 249318 lb of fuel, of which 18000 lb are in each external tank.
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That leaves 213318 of fuel to be distributed in the wings and
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fuselage.
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-->
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<tank x="-20.0" y="10.0" z="2.0" capacity="70000"/>
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<tank x="-20.0" y="-10.0" z="2.0" capacity="70000"/>
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<tank x="-20.0" y="0.0" z="2.3" capacity="73318"/>
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<tank x="-30.0" y="28.0" z="1.5" capacity="18000"/>
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<tank x="-30.0" y="-28.0" z="1.5" capacity="18000"/>
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<!-- This is to level the aircraft on the ground
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-->
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<ballast x="-12.0" y="0" z="0" mass="40000"/>
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</airplane>
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