Andy Ross wrote:
> Oh, and Gene: I've got an F-15C for you (attached) but I'm not
> entirely satified with it. What's happened is that the "parasite"
> drag has to be pushed so low by the solver in order to match the mach
> 2.5 cruise number that the induced drag (that is, the backwards
> component of the lift at non-zero AoA) ends up dominating. The
> aircraft bleeds speed *fast* in a turn, much faster than the A-4,
> which has a broadly similar wing configuration and loading. I'll need
> to put in supersonic drag handling before this works really well. But
> it takes off, lands, and accelerates more or less like the real thing.
Oops, I lied. Now it's attached. Apologies.
Andy
--
Andrew J. Ross NextBus Information Systems
Senior Software Engineer Emeryville, CA
[EMAIL PROTECTED] http://www.nextbus.com
"Men go crazy in conflagrations. They only get better one by one."
- Sting (misquoted)
<airplane mass="28600">
<!-- Approach configuration. This is actually a stall speed. The AoA
of 23 degrees isn't necessarily right; it's the peak of buffet
according to Gene's flight manual, which should be close. If
anyone has good AoA data for an F-15, let me know. -->
<approach speed="104" aoa="23">
<control axis="/controls/flaps" value="1.0"/>
</approach>
<!-- Cruise configuration (mach 2.5) -->
<cruise speed="1400" alt="45000">
<control axis="/controls/throttle[0]" value="1.0"/>
<control axis="/controls/throttle[1]" value="1.0"/>
<control axis="/controls/afterburner[0]" value="1.0"/>
<control axis="/controls/afterburner[1]" value="1.0"/>
<control axis="/controls/flaps" value="0.0"/>
</cruise>
<cockpit x="-4.31" y="0.00" z="1.56"/>
<fuselage ax="0.00" ay="0.00" az="0.00" bx="-10.78" by="0.00" bz="0.00"
width="1.20"/>
<fuselage ax="-5.51" ay="1.44" az="0.24" bx="-17.36" by="1.20" bz="0.24"
width="0.96"/>
<fuselage ax="-5.51" ay="-1.44" az="0.24" bx="-17.36" by="-1.20" bz="0.24"
width="0.96"/>
<wing x="-11.73" y="1.92" z="0.60" length="5.15" chord="5.75"
taper=".33" sweep="28">
<stall aoa="27" width="10" peak="1.5"/>
<flap0 start="0.03" end="0.53" lift="1.6" drag="2.0"/>
<flap1 start="0.53" end="0.70" lift="1.6" drag="2.0"/>
<control axis="/controls/flaps" output="FLAP0"/>
<control axis="/controls/aileron" output="FLAP1" split="true"/>
<control axis="/controls/aileron-trim" output="FLAP1" split="true"/>
</wing>
<!-- Note: F-15's have all-moving tail surfaces, but YASim doesn't yet
support that. Model the deflection as a regular flap, rather
than a change in incidence right now. -->
<hstab x="-16.76" y="1.80" z="0.24" length="2.87" chord="3.35"
taper=".36" sweep="33.5">
<stall aoa="27" width="10" peak="1.5"/>
<flap0 start="0" end="1" lift="1.6" drag="1.9"/>
<control axis="/controls/elevator" output="FLAP0"/>
<control axis="/controls/elevator-trim" output="FLAP0"/>
</hstab>
<vstab x="-16.16" y="1.80" z="0.48" length="3.59" chord="3.11"
taper=".27" sweep="19">
<stall aoa="27" width="10" peak="1.5"/>
<flap0 start="0.16" end="0.57" lift="1.3" drag="1.5"/>
<control axis="/controls/rudder" output="FLAP0" invert="true"/>
<control axis="/controls/rudder-trim" output="FLAP0" invert="true"/>
</vstab>
<vstab x="-16.16" y="-1.80" z="0.48" length="3.59" chord="3.11"
taper=".27" sweep="19">
<stall aoa="27" width="10" peak="1.5"/>
<flap0 start="0.16" end="0.57" lift="1.3" drag="1.5"/>
<control axis="/controls/rudder" output="FLAP0" invert="true"/>
<control axis="/controls/rudder-trim" output="FLAP0" invert="true"/>
</vstab>
<jet x="-10.78" y="1.08" z="0.24" mass="4000"
thrust="14670" afterburner="23830" exhaust-speed="2000">
<control axis="/controls/throttle[0]" output="THROTTLE"/>
<control axis="/controls/afterburner[0]" output="REHEAT"/>
</jet>
<jet x="-10.78" y="-1.08" z="0.24" mass="4000" thrust="14670"
afterburner="23830" exhaust-speed="2000">
<control axis="/controls/throttle[1]" output="THROTTLE"/>
<control axis="/controls/afterburner[1]" output="REHEAT"/>
</jet>
<!-- This is a guess. I don't have any good information about the
F-15's tank configuration. Internal fuel capacity is 11600 lbs,
put it in two tanks just outboard of the engines for now. -->
<tank x="-10.75" y="1.5" z="0.25" capacity="5800" jet="true"></tank>
<tank x="-10.75" y="-1.5" z="0.25" capacity="5800" jet="true"></tank>
<gear x="-6.35" y="0.00" z="-1.80" compression=".75" retract-time="7">
<control axis="/controls/rudder" output="STEER" square="true"/>
</gear>
<ballast x="-3.0" y="0" z="0" mass="1000"/>
<ballast x="-5.0" y="0" z="0" mass="1000"/>
<ballast x="-15" y="1.2" z="0.24" mass="-1000"/>
<ballast x="-15" y="-1.2" z="0.24" mass="-1000"/>
<gear x="-11.73" y="1.32" z="-2.04" compression=".75" retract-time="7">
<control axis="/controls/brakes[0]" output="BRAKE"/>
</gear>
<gear x="-11.73" y="-1.32" z="-2.04" compression=".75" retract-time="7">
<control axis="/controls/brakes[1]" output="BRAKE"/>
</gear>
</airplane>
<?xml version="1.0"?>
<PropertyList>
<sim>
<flight-model>yasim</flight-model>
<aero>f15</aero>
<fuel-fraction>1.0</fuel-fraction>
<sound>true</sound>
<panel>
<path>Aircraft/c172/Panels/c172-vfr-panel.xml</path>
</panel>
<panel_2>
<path>Aircraft/c172/Panels/c172-trans-mini-panel.xml</path>
</panel_2>
<model>
<path><!-- you need to set this --></path>
</model>
</sim>
</PropertyList>
