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FS2004 Propeller Control

P

PaulJC

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unitedkingdom
I am trying to get the engine performance for the aircraft model I have made right, it is a twin turbocharged piston powered aircraft with constant speed props, in both the air file & aircraft.cfg I have entered the relevant data for a turbo assisted engine, including the max_rated_rpm= 2900.0,max_design_mp= 41.0 & critical_altitude= 18000.0, but I can't adjust the RPM with the prop lever, only all or nothing, levers at max= max RPM & if I bring them back the RPM does not change until the levers are in the feather position, however if I change the critical_altitude= to 0.0 I have full control of the RPM.

I hope someone can help me as I am new to this.
 
Last edited:
Can I elaborate on the problem I am having with the prop control levers, it is an FS9 model I have made, as I don't have the FSX SDK, I would like the aircraft to be used in both FS9 & FSX, but the problem is that I have since tested the aircraft again in FS9 & the prop control levers work OK, but in FSX they don't, is there a compatibility issue regarding native FS9 aircraft.cfg's & air files (I used the twin piston files from the FS9 templates folder as my starting point) being used in FSX, especially any that would cause the problem I'm experiencing.

Any help would be much appreciated.
 
Make sure the beta_min and beta_max are set. Here is my latest config using 18,000 ft for critical altitude.
Try using this as a template to see what happens....Or use it to compare!

Code: 
[GeneralEngineData]
engine_type = 0                                 //0=Piston, 1=Jet, 2=None, 3=Helo-Turbine, 4=Rocket, 5=Turboprop
Engine.0 = 3.7, -8.4, -1.3                      //(feet) longitudinal, lateral, vertical distance from reference datum
Engine.1 = 3.7,  8.4, -1.3                      //(feet) longitudinal, lateral, vertical distance from reference datum
fuel_flow_scalar= 1.5                           //Fuel flow scalar
min_throttle_limit = 0.0                        //Minimum percent throttle.  Generally negative for turbine reverser
master_ignition_switch = 2                      //Master Ignition Switch

[piston_engine]
power_scalar = 1.0                              //Piston power scalar
cylinder_displacement= 76.5                     //Cubic inches per cylinder
compression_ratio= 8.0                          //Compression ratio
number_of_cylinders=6                           //Number of cylinders
max_rated_rpm= 2700.0                           //Max rated RPM
max_rated_hp= 325                               //Max rated HP
fuel_metering_type= 0                           //0=Fuel Injected, 1=Gravity Carburetor, 2=Aerobatic Carburetor
cooling_type= 0                                 //0=Cooling type Air, 1=Cooling type Liquid
normalized_starter_torque= 0.6                  //Starter torque factor
turbocharged= 1                                 //Is it turbocharged? 0=FALSE, 1=TRUE
max_design_mp= 39.0                             //Max design manifold pressure, (inHg)
min_design_mp= 5.0                              //Min design manifold pressure, (inHg)
critical_altitude= 18000.0                      //Altitude to which the turbocharger will provide max design manifold pressure (feet)
emergency_boost_type= 0                         //0=None, 1=Water Injection, 2=Methanol/Water injection, 3=War Emergency Power
emergency_boost_mp_offset= 0                    //Additional manifold pressure supplied by emergency boost
emergency_boost_gain_offset= 0                  //Multiplier on manifold pressure due to emergency boost
fuel_air_auto_mixture= 0                        //Automixture available? 0=FALSE, 1=TRUE
auto_ignition= 0                                //Auto-Ignition available? 0=FALSE, 1=TRUE
max_rpm_mechanical_efficiency_scalar= 1.0       //Scalar on maximum RPM mechanical efficiency
idle_rpm_mechanical_efficiency_scalar= 1.0      //Scalar on idle RPM mechanical efficiency
max_rpm_friction_scalar= 1.1                    //Scalar on maximum RPM friction
idle_rpm_friction_scalar= 0.9                   //Scalar on idle RPM friction
magneto_order_left_right_both = 1        //sets the order of the magneto switch direction


[propeller]
thrust_scalar = 1.0                             //Propeller thrust scalar
propeller_type= 0                               //0=Constant Speed, 1=Fixed Pitch
propeller_diameter= 6.3                         //Propeller Diameter, (feet)
propeller_blades= 3                             //Number of propeller blades
propeller_moi= 9.9                              //Propeller moment of inertia
beta_max= 45.0                                  //Maximum blade pitch angle for constant speed prop, (degrees)
beta_min= 15.0                                  //Minimum blade pitch angle for constant speed prop, (degrees)
min_gov_rpm= 550                                //Miminum governed RPM
prop_tc= 0.1                                    //Prop time-constant
gear_reduction_ratio= 0.87                      //Propeller gear reduction ratio
fixed_pitch_beta= 0.0                           //Fixed pitch angle of fixed pitch prop, (degrees)
low_speed_theory_limit= 80.0                    //Speed at which low speed theory becomes blended in (feet/second)
prop_sync_available= 1                          //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= 700.0                      //Minimum RPM for prop feathering
beta_feather= 82.5                              //Feathering pitch angle (degrees)
power_absorbed_cf= 0.9                          //Coefficient of friction for power absorbed by propeller in feather
defeathering_accumulators_available= 0          //Defeathering accumulators available? 0=FALSE, 1=TRUE
prop_reverse_available= 0                       //Prop reverse available?  0=FALSE, 1=TRUE
minimum_on_ground_beta= 0.0                     //Miminum pitch angle on ground, (degrees)
minimum_reverse_beta= 0.0                       //Minimum pitch angle in reverse, (degrees)
feathering_switches = 1,1                       //Switches which invoke feathering
 
delivery guy,
Your code helped, as it showed that I had nothing wrong with my code, however I did another test flight & found that if I pulled back the throttles slightly from max, then the prop control levers worked as they should, reducing RPM.
 
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