02b4b4a3f0
Here're some updates for some of the instruments, the TSR2 and the B52. The instruments are just parameterised/non-specific versions of the engine and fuel gauges. The old gauges will still be used by the a10s and the sea hawks until I get them done. There're a couple of tweaks to the tsr2 yasim config and amendments to the model file to change the angle at which the airbrakes operate, correct the direction that the nose gear retracts/extends and to rotate the main-gear carts during retraction/extention. There're also new panels, using the new instruments. The b52 yasim config has some big changes due to finding some more info i.e. wing incidence of 6 degrees, fuel capacities and aileron changes (removed from G & H versions!). It's now based on an 'F' model and I've put some comments in the yasim config about it. The b52-readme.txt includes a suggested method on getting airborne;). I've included an amended model - B52-F.3ds, which is the default in the new model file, and a couple of panels. I'm quite pleased with the b52 - the take-offs resemble the photographs I've seen and I think I've got reasonable values where I've had to guess at stuff, but the results from the yasim solver look as through the model is approaching the limits of acceptability for yasim. By this I mean that the model is probably a bit dodgy, not that the yasim solver is limited.
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/throttle[0]" value="0.1"/>
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<control-setting axis="/controls/throttle[1]" value="0.1"/>
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<control-setting axis="/controls/throttle[2]" value="0.1"/>
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<control-setting axis="/controls/throttle[3]" value="0.1"/>
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<control-setting axis="/controls/throttle[4]" value="0.1"/>
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<control-setting axis="/controls/throttle[5]" value="0.1"/>
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<control-setting axis="/controls/throttle[6]" value="0.1"/>
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<control-setting axis="/controls/throttle[7]" value="0.1"/>
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<control-setting axis="/controls/flaps" value="1.0"/>
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<control-setting axis="/controls/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/throttle[0]" value="0.6"/>
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<control-setting axis="/controls/throttle[1]" value="0.6"/>
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<control-setting axis="/controls/throttle[2]" value="0.6"/>
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<control-setting axis="/controls/throttle[3]" value="0.6"/>
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<control-setting axis="/controls/throttle[4]" value="0.6"/>
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<control-setting axis="/controls/throttle[5]" value="0.6"/>
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<control-setting axis="/controls/throttle[6]" value="0.6"/>
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<control-setting axis="/controls/throttle[7]" value="0.6"/>
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<control-setting axis="/controls/flaps" value="0.0"/>
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<control-setting axis="/controls/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/flaps" control="FLAP0"/>
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<control-input axis="/controls/aileron" control="FLAP1" split="true"/>
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<control-input axis="/controls/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/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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<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/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/throttle[0]" 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/throttle[1]" 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/throttle[2]" 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/throttle[3]" 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/throttle[4]" 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/throttle[5]" 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/throttle[6]" 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/throttle[7]" 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/rudder" control="STEER" square="true"/>
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<control-input axis="/controls/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/rudder" control="STEER" square="true"/>
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<control-input axis="/controls/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/brakes" control="BRAKE"/>
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<control-input axis="/controls/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/brakes" control="BRAKE"/>
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<control-input axis="/controls/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/brakes[0]" control="BRAKE"/>
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<control-input axis="/controls/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/brakes[1]" control="BRAKE"/>
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<control-input axis="/controls/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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