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Hello Curt,

Browse source 
here's an update to the b52 - it's just some relatively minor changes to the
fdm and panels.

I've been trying to improve the take-off and landing characteristics, or at
least get them to fit the pictures and film I've seen.

The best way to take off is by using the autopilot - at sea level just extend
the flaps, punch in the altitude hold on the autopilot (and heading if you're
lazy), and apply full power.  It'll also take of with the default the default
elevator trim of -0.07 but it 'staircases' a little bit - the auto pilot
smooths that out.

I've included some notes and observations about taking-off and landing in the
readme.

While I wouldn't claim any sort of accuracy for it, I hope it manages to get
some of the characteristics right.
This commit is contained in:
curt 2003-05-12 19:45:55 +00:00
parent 61bb6fd71c
commit 3ca5b27927
2 changed files with 36 additions and 29 deletions
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57
Aircraft-yasim/b52-yasim.xml
View file

@ -33,16 +33,19 @@ Lee Elliott. leee-fgfs@spatial.freeserve.co.uk
<airplane mass="173599">
<!-- Approach configuration -->
<!-- Although the approach speed is set to 100 I reccommend that it is
kept above 120, especially if a lot of fuel remains -->
<approach speed="100" aoa="0.5">
<control-setting axis="/controls/engines/engine[0]/throttle" value="0.1"/>
<control-setting axis="/controls/engines/engine[1]/throttle" value="0.1"/>
<control-setting axis="/controls/engines/engine[2]/throttle" value="0.1"/>
<control-setting axis="/controls/engines/engine[3]/throttle" value="0.1"/>
<control-setting axis="/controls/engines/engine[4]/throttle" value="0.1"/>
<control-setting axis="/controls/engines/engine[5]/throttle" value="0.1"/>
<control-setting axis="/controls/engines/engine[6]/throttle" value="0.1"/>
<control-setting axis="/controls/engines/engine[7]/throttle" value="0.1"/>
<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[2]/throttle" value="0.4"/>
<control-setting axis="/controls/engines/engine[3]/throttle" value="0.4"/>
<control-setting axis="/controls/engines/engine[4]/throttle" value="0.4"/>
<control-setting axis="/controls/engines/engine[5]/throttle" value="0.4"/>
<control-setting axis="/controls/engines/engine[6]/throttle" value="0.4"/>
<control-setting axis="/controls/engines/engine[7]/throttle" value="0.4"/>
<control-setting axis="/controls/flight/flaps" value="1.0"/>
<control-setting axis="/controls/flight/spoilers" value="0.0"/>
<control-setting axis="/controls/gear/gear-down" value="1"/>
</approach>
@ -56,17 +59,22 @@ Lee Elliott. leee-fgfs@spatial.freeserve.co.uk
designed to reduce stress on the airframe during low-level
operations and was able to fly 10 knots faster than the speed
at which a normal b52 would have disintegrated due to flutter.
With these settings I was able sustain flight at 37,000 ft @ about
520 KTAS. I've been able to achieve greater altitudes but the
speed gradually bleeds off.
-->
<cruise speed="554" alt="21000">
<control-setting axis="/controls/engines/engine[0]/throttle" value="0.6"/>
<control-setting axis="/controls/engines/engine[1]/throttle" value="0.6"/>
<control-setting axis="/controls/engines/engine[2]/throttle" value="0.6"/>
<control-setting axis="/controls/engines/engine[3]/throttle" value="0.6"/>
<control-setting axis="/controls/engines/engine[4]/throttle" value="0.6"/>
<control-setting axis="/controls/engines/engine[5]/throttle" value="0.6"/>
<control-setting axis="/controls/engines/engine[6]/throttle" value="0.6"/>
<control-setting axis="/controls/engines/engine[7]/throttle" value="0.6"/>
<control-setting axis="/controls/engines/engine[0]/throttle" value="0.5"/>
<control-setting axis="/controls/engines/engine[1]/throttle" value="0.5"/>
<control-setting axis="/controls/engines/engine[2]/throttle" value="0.5"/>
<control-setting axis="/controls/engines/engine[3]/throttle" value="0.5"/>
<control-setting axis="/controls/engines/engine[4]/throttle" value="0.5"/>
<control-setting axis="/controls/engines/engine[5]/throttle" value="0.5"/>
<control-setting axis="/controls/engines/engine[6]/throttle" value="0.5"/>
<control-setting axis="/controls/engines/engine[7]/throttle" value="0.5"/>
<control-setting axis="/controls/flight/flaps" value="0.0"/>
<control-setting axis="/controls/flight/spoilers" value="0.0"/>
<control-setting axis="/controls/gear/gear-down" value="0"/>
</cruise>
@ -82,21 +90,20 @@ Lee Elliott. leee-fgfs@spatial.freeserve.co.uk
quarter-chord. As yasim uses mid-chord I've subtracted 0.5 degree
as a fudge factor.
Yasim also only allows for one [real] flap entry per wing so I
specify the two separate flap sections on each wing (see Notes.
above) with the aileron between them. Instead, I've stuck the
aileron after the flaps and reduced their lift.
Yasim also only allows for one [real] flap entry per wing so I've
used a single spane but reduced it's length by the width of the
aileron, which I've located outboard of the flaps.
-->
<wing x="-16.0" y="1.6" z="1.2" taper="0.4" incidence="6"
length="31.1" chord="10.0" sweep="34.5" dihedral="-3.0" camber="0.16">
<stall aoa="15.0" width="2" peak="1.3"/>
<flap0 start="0.0" end="0.7" lift="1.5" drag="1.8"/>
<flap1 start="0.7" end="0.78" lift="1.3" drag="1.2"/>
<spoiler start="0.5" end="0.75" lift="0.0" drag="20.0"/>
<stall aoa="18.0" width="2" peak="1.3"/>
<flap0 start="0.0" end="0.62" lift="1.45" drag="1.8"/>
<flap1 start="0.62" end="0.7" lift="1.3" drag="1.2"/>
<spoiler start="0.5" end="0.75" lift="0.0" drag="8.0"/>
<control-input axis="/controls/flight/flaps" control="FLAP0"/>
<control-input axis="/controls/flight/aileron" control="FLAP1" split="true"/>
<control-input axis="/controls/flight/spoilers" control="SPOILER"/>
<control-input axis="/controls/flight/spoilers" control="SPOILER" split="false"/>
<control-output control="FLAP0" prop="/surface-positions/flap-pos-norm"/>
<control-output control="FLAP1" side="left" prop="/surface-positions/left-aileron-pos-norm"/>

8
Aircraft/b52-yasim-set.xml
View file

@ -52,7 +52,7 @@ B52-H set file.
<view n="1">
<config>
<!-- big plane, so extend chase view offset a bit -->
<z-offset-m type="double" archive="y">-100.0</z-offset-m>
<z-offset-m type="double" archive="y">-70.0</z-offset-m>
</config>
</view>
@ -61,7 +61,7 @@ B52-H set file.
<controls>
<flight>
<elevator-trim type="float">-0.14</elevator-trim>
<elevator-trim type="float">-0.07</elevator-trim>
</flight>
</controls>
@ -81,8 +81,8 @@ B52-H set file.
<max-aileron type="float">1.0</max-aileron>
<max-roll-deg type="float">40.0</max-roll-deg>
<roll-out-deg type="float">18.0</roll-out-deg>
<roll-out-smooth-deg type="float">20.0</roll-out-smooth-deg>
<roll-out-deg type="float">15.0</roll-out-deg>
<roll-out-smooth-deg type="float">15.0</roll-out-smooth-deg>
<zero-pitch-throttle type="float">0.5</zero-pitch-throttle>
<zero-pitch-trim-full-throttle type="float">0.001</zero-pitch-trim-full-throttle>