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.