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FSX Help editing Aircraft.CFG files

Discussion in 'Other' started by stug, 30/7/09.

  1. stug

    stug

    Joined:
    30/7/09
    Messages:
    1
    Country:
    ca-alberta
    I've been working on a test concept for converting a DC-4 to a turboprop engine.

    I've tried everything I can think of but the engine will not run when I change the engine type in the aircraft.cfg file.


    [GeneralEngineData]
    engine_type=5
    Engine.0=9,-26,-1.25
    Engine.1=10.83,-12.33,-1.25
    Engine.2=10.83,12.33,-1.25
    Engine.3=9,26,-1.25
    fuel_flow_scalar=1.0
    min_throttle_limit=-0.499939


    [TurbineEngineData]
    fuel_flow_gain=0.014 //Gain on fuel flow
    inlet_area=1.180 //Square Feet, engine nacelle inlet area
    rated_N2_rpm=29920.000 //RPM, second stage compressor rated value
    static_thrust=158.000 //Lbs, max rated static thrust at Sea Level
    afterburner_available=0
    reverser_available=0


    [propeller]
    thrust_scalar = 1.0 //Propeller thrust scalar
    propeller_type = 0 //0=Constant Speed, 1=Fixed Pitch
    propeller_diameter = 13.1 //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)

    [turboprop_engine]
    power_scalar=1.0 //Scalar on Turboprop power
    maximum_torque=4860.000 //max take-off rating is 4860 ft-lb at 1210 RPM

    [fuel]

    LeftMain =0,-15,0,2080,0
    RightMain=0, 15,0,2080,0
    fuel_type=2.000000
    number_of_tank_selectors=1
    electric_pump=1

    Listed above is the code I used. What did I do wrong, or am I simply attempting the impossible.
  2. robystar

    robystar

    Joined:
    4/10/06
    Messages:
    3,127
    Not sure, but in this case the .air file might override the cfg.
    Try also changing the engine type in the .air file. or better still, use a turboprop .air file.
  3. Chazz

    Chazz

    Joined:
    3/6/09
    Messages:
    31
    Country:
    germany
    Hi,

    at the moment i'm editing a aircraft.cfg file.
    and my problem is the moment of inertia calculation.

    Plane is a Comco Ikarus C42 B
    empty weight = 622.365 lbs
    length = 20.50525 ft

    Microsoft
    gives me that formula to calculate it.

    MOI = EmptyWeight * (D^2 / K)

    would mean

    MOI = MOI = 622.365lbs * (20.50525ft^2 / K???)


    what the hell is K??? i searched google but it didn't realy help me.

    Could someone explain "K" for dummies?

    thank you
  4. n4gix

    n4gix Resource contributor

    Joined:
    26/9/06
    Messages:
    9,062
    Country:
    unitedstates
    The FSX SDK tells you what "K" is. It is a constant that they have defined as:

    Code:
       Pitch     Roll      Yaw 
    K = 810      1870      770 
    Note that there are three different MOI's defined:
    empty_weight_pitch_moi
    empty_weight_roll_moi
    empty_weight_yaw_moi

    So, whichever MOI you are calculating, use the constant they've suggested! ;)

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