<?xml version="1.0" encoding="utf-8"?>
<!--

  Zeppelin LZ 121 "Nordstern" airship flight model for JSBSim.

    Copyright (C) 2010  Anders Gidenstam  (anders(at)gidenstam.org)

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
  
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
  
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  
-->
<propeller name="Zeppelin 3.2m 2-bladed wooden propeller">

 <documentation>
   JavaProp: Designed for max power and RPM at 130 kph.
     #blades 2
     n          1400 RPM
     D          3.20 m
     Spinner D  0.20 m
     Velocity   36.1 m/s
     Power      178967.97 W

   Airfoil
     Clark Y, Re=500000
     Clark Y, Re=500000
     Clark Y, Re=500000
     Flat plate, Re=500000

   v/(nD)       0.483            v/(ΩR)   0.154
   Efficiency η 73.427 %         loading  medium
   Thrust  T    2,736.84 N       Ct       0.1054
   Power  P     134.22 kW        Cp       0.0958
   β at 75%R    21.9°            Pitch H  2.55 m
 </documentation>

 <documentation>
   The intertia is assumed to be
     n * 1/3*m_b*(d^2)/4
   where
     n is the number of blades,
     m_b is the mass of a blade and
     d is the diameter.

   2/3 of the total propeller weight is assumed to be in the blades.
 </documentation>

 <ixx> 33.2 </ixx>
 <diameter unit="M">3.2</diameter>
 <numblades> 2.0 </numblades>
 <gearratio> 1.0 </gearratio>

 <table name="C_THRUST" type="internal">
  <tableData>
0.000	0.082728
0.050	0.084447
0.100	0.083640
0.150	0.082326
0.200	0.080507
0.250	0.078060
0.300	0.074884
0.350	0.070712
0.400	0.064771
0.450	0.057020
0.500	0.049034
0.550	0.040638
0.600	0.031911
0.650	0.022879
0.660	0.021039
0.670	0.019187
0.680	0.017324
0.690	0.015451
0.700	0.013567
0.710	0.011669
0.720	0.009762
0.730	0.007842
0.740	0.005910
0.750	0.003989
0.760	0.002026
0.770	0.000081
0.780	-0.001944
0.790	-0.003922
0.800	-0.005900
  </tableData>
 </table>

 <table name="C_POWER" type="internal">
  <tableData>
0.000	0.042111
0.050	0.043105
0.100	0.042588
0.150	0.042160
0.200	0.042048
0.250	0.041884
0.300	0.041572
0.350	0.040952
0.400	0.039386
0.450	0.036581
0.500	0.033212
0.550	0.029193
0.600	0.024512
0.650	0.019144
0.660	0.017988
0.670	0.016803
0.680	0.015591
0.690	0.014352
0.700	0.013087
0.710	0.011793
0.720	0.010474
0.730	0.009125
0.740	0.007747
0.750	0.006355
0.760	0.004910
0.770	0.003455
0.780	0.001918
0.790	0.000391
0.800	-0.00116
  </tableData>
 </table>


</propeller>
