<?xml version="1.0"?>
<!--
  File:     R-1820-R52.xml
  Author:   Ron Jensen

  References:
     
37.0    2350    875
-->

<piston_engine name="R-1820-R52">
  <minmp unit="INHG">          9.8 </minmp>
  <maxmp unit="INHG">         37.0 </maxmp>
  <displacement unit="IN3"> 1820.0 </displacement>
  <!-- Defining <bsfc> over-rides the bsfc value calculated from <maxhp> -->
  <!--<bsfc>           0.45 </bsfc>-->
  <maxhp>                   875.00 </maxhp>
  <cycles>                    4.0  </cycles>
  <cylinders>                 9.0  </cylinders>
  <bore unit="IN">            6.125</bore>
  <stroke unit="IN">          6.875</stroke>
  <compression-ratio>         6.4  </compression-ratio>
  <idlerpm>                 550.0  </idlerpm>
  <maxrpm>                 2350.0  </maxrpm>
  <maxthrottle>               1.0  </maxthrottle>
  <minthrottle>               0.1  </minthrottle>
  <sparkfaildrop>             0.1  </sparkfaildrop>


<!-- Boost numbers estimated -->
  <numboostspeeds>             1 </numboostspeeds>
  <boostoverride>              0 </boostoverride>
  <ratedboost1 unit="PSI">     3.5 </ratedboost1>
  <ratedpower1 unit="HP">   1200 </ratedpower1>
  <ratedrpm1>               2350 </ratedrpm1>
  <ratedaltitude1>             0 </ratedaltitude1>
<!--  <takeoffboost>   0</takeoffboost> -->

</piston_engine>
