User manual

24 25
• Drag: In PFPX the Drag value can be configured to adjust perfor-
mance variations for different add-ons. Note: A Drag value of
105% means that the True Airspeed (TAS) is reduced by 5%
below aircraft performance values.
• Evaluate: The Evaluate dialog allows to quickly determine Bias
and Drag values for a specific aircraft type by comparing PFPX
values with in-flight readings of a specific Flight Simulator add-
on. An in-flight data reading should be done at optimum alti-
tude and common speed schedule/cost index of the airplane
desired. Enter the airplane’s gross weight, altitude, present
speed schedule, fuel flow per hour (total of all operating en-
gines), Static Air Temperature (SAT), True Air Speed (TAS) and
Ground Speed (GS). PFPX will propose a Bias and a Drag value.
Use the Apply button to accept these values.