In virtually every aircraft .cfg file, I find the following four parameters:
max_rpm_mechanical_efficiency_scalar
idle_rpm_mechanical_efficiency_scalar
max_rpm_friction_scalar
idle_rpm_friction_scalar
Can anyone explain what these four parameters are and what they do - OK, I can see that they relate to engine mechanical efficiency and friction. What I would like to know is how they may be used to 'tweak' engine performance - particularly engine rpm
try looking for this section
the first section is for propeller driven aircraft and the second section can be used in both props and jets.
[propeller]
thrust_scalar = 1.0 //Propeller thrust scalar
propeller_type = 0 //0=Constant Speed, 1=Fixed Pitch
propeller_diameter = 8.8 //Propeller Diameter, (feet)
propeller_blades = 3 //Number of propeller blades
propeller_moi = 19 //Propeller moment of inertia
beta_max = 45 //Maximum blade pitch angle for constant speed prop, (degrees)
beta_min = 15.6 //Minimum blade pitch angle for constant speed prop, (degrees)
min_gov_rpm = 25520 //Miminum governed RPM
prop_tc = 0.004 //Prop time-constant
gear_reduction_ratio = 17.4 //Propeller gear reduction ratio
fixed_pitch_beta = 0 //Fixed pitch angle of fixed pitch prop, (degrees)
low_speed_theory_limit = 80 //Speed at which low speed theory becomes blended in (feet/second)
prop_sync_available = 0 //Prop synchronization available? 0=FALSE, 1=TRUE
prop_deice_available = 1 //Prop de-icing available? 0=FALSE, 1=TRUE
prop_feathering_available= 1 //Prop feathering available? 0=FALSE, 1=TRUE
prop_auto_feathering_available= 1 //Prop auto-feathering available? 0=FALSE, 1=TRUE
min_rpm_for_feather = 700 //Minimum RPM for prop feathering
beta_feather = 88.0 //Feathering pitch angle (degrees)
power_absorbed_cf = 0.9 //Coefficient of friction for power absorbed by propeller
defeathering_accumulators_available= 0 //Defeathering accumulators available? 0=FALSE, 1=TRUE
prop_reverse_available = 1 //Prop reverse available? 0=FALSE, 1=TRUE
minimum_on_ground_beta = 1.0 //Miminum pitch angle on ground, (degrees)
minimum_reverse_beta = -14.0 //Minimum pitch angle in reverse, (degrees)
[TurbineEngineData]
fuel_flow_gain = 0.011 //Gain on fuel flow
inlet_area = 1.0 //Square Feet, engine nacelle inlet area
rated_N2_rpm = 33000 //RPM, second stage compressor rated value
static_thrust = 158 //Lbs, max rated static thrust at Sea Level
[turboprop_engine]
power_scalar = 1.0 //Scalar on Turboprop power
maximum_torque = 1865 //Maximum torque available (ft-lbs)
it is in this area wher you can effect the most change but before you do any thing make a backup copy and any change you make start out with small increments 8-)
