SE 212 Durandal

The Zagi configuration file is as follows, in part:

 <aero version="1" units="0">

    <ref chord="0.833333" span="4" area="3.33333" speed="19.685" />

Reference chord and span, area all in feet adn sq ft.   Converting:  Ref chord = 0.254m,  span =  1.22 metres and Area is 0.3716 sq. m

The Durandal model, 1:10 scale, will have a chord of , span of, and wing area of.

Reverse converting:

    <misc Alpha_0="0" eta_loc="0.25" CG_arm="0.25" span_eff="0.85" />

    <m Cm_0="0.0100395" Cm_a="-0.42268" Cm_q="-1.68929" Cm_de="-0.210653" />

    <lift CL_0="0.132896" CL_max="1.1" CL_min="-0.8" CL_a="4.08115" CL_q="4.90714"

       CL_de="0.49144" CL_drop="0.1" CL_CD0="0.3" />

    <drag CD_prof="0.025" Uexp_CD="-0.5" CD_stall="0" CD_CLsq="0.02" CD_AIsq="0.04"

       CD_ELsq="0.04" />

CD_prof may need changing

    <Y CY_b="-0.10799" CY_p="-0.03859" CY_r="0.0595832" CY_dr="0" CY_da="0.02049" />

    <l Cl_b="-0.05249" Cl_p="-0.42547" Cl_r="0.04428" Cl_dr="0" Cl_da="0.13327" />

    <n Cn_b="0.0213716" Cn_p="-0.000882313" Cn_r="-0.0122373" Cn_dr="0"

       Cn_da="-0.00725753" />

  </aero>

The moments of inertia and the motor files are as follows:

<mass_inertia version="1" units="0" Mass="0.0475927" I_xx="0.0208188"

0.0475927 Slug = 694.563244 Gram.  The Zagi weighs 700 g approx.  Compare this to a similar sized Mirage model and 

we can work out how accurate this is.    I_YY appears to be pitch moment of inertia.

       I_yy="0.00449063" I_zz="0.0252959" I_xz="0" />

    <sound version="1">

      <sample filename="electric.wav" type="1" pitchfactor="0.007" maxvolume="1" />

    </sound>

Power units: I plan to use the battery model of the Flexifly with a NiMh or LiPo battery, these batteries run down in the simulator,  the default battery has unlimited duration.

    <power units="1">

      <automagic F="2.668932" V="12.501971">

        <battery throttle_min="0">

          <automagic T="420" />

          <shaft J="0" brake="1">

            <propeller D="0.24384" H="0.170688" J="0" n_fold="5" />

            <engine>

              <automagic omega_p="2827" eta_opt="0.78" eta="0.7" />

            </engine>

          </shaft>

        </battery>

      </automagic>

    </power>

  </config>

Flexifly XLM

<power units="1">

        <battery filename="nimh7_kan1050" throttle_min="0">

          <shaft J="0" brake="1">

            <propeller D="0.15" H="0.075" J="0" n_fold="5" >

              <pos x="0.09" downthrust="6" />

            </propeller>

            <engine filename="Mabuchi_380_FR" />

          </shaft>

        </battery>

    </power>

Battery config file is below. If you change battery to   C="0.0300" then the motor switches off in about 10 seconds. This is a good way

of making realistic battery limits.  C="0.100" results in 2 minutes power 

<battery C="0.300" U_0="10.5" U_off="5.5" R_I="9E-3">

     <U_0rel>

       1.00;

       0.93;

.

  ...

     </U_0rel>

   </battery>