<?xml version="1.0"?>
<!--

Neuform 3-blade propeller TR3-73-25

http://www.neuform-composites.de/
mass: 5.5 kg
diameter 68" / 1.73m

estimated 1kg for the hub, 1.5kg each blade

Note:
The C_THRUST table data is suspicious low compared to typical values.
Also the efficiency calculated from this values is way too low 
(less than 45%; typical values are 70%-80%).

To get the correct climb rate for the Dragonfly, a ct_factor of 1,73 
is required. This value is exactly the propeller diameter in meter.
Max. efficiency increases to 75%.

It seems that the C_THRUST values are related to diameter^5 
instead of diameter^4 (CT=T/(rho*n^2*Diameter^4 [kg/m^3 * 1/s^2 * m^4] )

-->

<propeller name="tr3-73-25" version="1.1">
  <ixx>0.827</ixx>
  <diameter unit="IN">68</diameter>
  <numblades>3</numblades>
  <gearratio>4.0</gearratio>
  <ct_factor>1.73</ct_factor>
  <cp_factor>1.</cp_factor>
  <table name="C_THRUST" type="internal">
    <tableData>
      0.0  0.1310
      0.1  0.1256
      0.2  0.1201
      0.3  0.1106
      0.4  0.0993
      0.5  0.0875
      0.6  0.0707
      0.7  0.0537
      0.8  0.0291
      1.0  -0.0098
      1.2  -0.0516
      1.4  -0.0927
    </tableData>
  </table>

  <table name="C_POWER" type="internal">
    <tableData>
      0.0   0.1350
      0.1   0.1350
      0.2   0.1318
      0.3   0.1287
      0.4   0.1212
      0.5   0.1111
      0.6   0.1019
      0.7   0.0856
      0.8   0.0699
      1.0   0.0250
      1.2  -0.0400
      1.4  -0.1202
      1.6  -0.2040
    </tableData>
  </table>

</propeller>

