Help editing Aircraft.CFG files

[stug]

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.

[robystar]

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.

[Chazz]

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 (http://msdn.microsoft.com/en-us/library/cc526949.aspx)
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

[n4gix]

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

The FSX SDK tells you what "K" is. It is a constant that they have defined as:


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! ;)