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Engine tuning

J

jogman49

Messages
4
Hi everybody !

I am one of those guys crasy about realism on fs9. I spent many hours every day to try to make it more realistic. My new project is the PAD Mitsubishi MU-2. I fly one so i know how it sould react and I decided to improve it. I have already created a new soundset for the Garrett TPE 331 engines, corected the spool up rate and the maximum power of the engines. Now i need help for the next step. The garrett tpe 331 engine dont works with 6 handles like the king air in example. (2 power levers 2 propeller levers 2 condition levers) Instead, there is 2 power levers ans 2 condition levers that actuates at the same time the props control. (similar to dash-8 controls)My question is, is it possible to edit the engine response to the condition lever ? I need 96% of engine RPM and between 5 to 20 torque when the conditon lever is selected to HI rpm on the ground. Than when you add power, the RPM increase to 100% and the torque raises. I don t know if flight sim can handle that but if you know how to do this i would like to know. I have not found anything in the .air file to help me.

G.F
 
flight dynamics

Hi,

First thing is to get a couple of programs.
Airedit and fsedit.

they are both free and should be easy to find.

The aircraft.cfg is where you will alter the engine performance.

dash 8 sample:

[GeneralEngineData]
engine_type = 5 //0=Piston, 1=Jet, 2=None, 3=Helo-Turbine, 4=Rocket, 5=Turboprop
Engine.0 = -28.4, -13.3, 2.7 //(feet) longitudinal, lateral, vertical distance from reference datum
Engine.1 = -28.4, 13.3, 2.7 //(feet) longitudinal, lateral, vertical distance from reference datum
fuel_flow_scalar = 1.0 //Scalar for fuel flow efficiency
min_throttle_limit = -0.25 //Minimum percent throttle. Generally negative for turbine reverser

[propeller]
thrust_scalar = 1.0 //Propeller thrust scalar
propeller_type = 0 //0=Constant Speed, 1=Fixed Pitch
propeller_diameter = 13.0 //Propeller Diameter, (feet)
propeller_blades = 4 //Number of propeller blades
propeller_moi = 77 //Propeller moment of inertia
beta_max = 45 //Maximum blade pitch angle for constant speed prop, (degrees)
beta_min = 12 //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 = 17.0 //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 = 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 //Minimum RPM for prop feathering
beta_feather = 79.3 //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 = 29920 //RPM, second stage compressor rated value
static_thrust = 200 //Lbs, max rated static thrust at Sea Level
Click to expand...


This is where you can tweak the performance and engine idle or rpm.
You will just have to do tests until your happy. This is how it is normally done.
Don't change too much at one. Make a backup.

Hope this help!

DG,:eek:
 
ok thanks for the answer ! I tried with the aircraft.cfg but I'm not able to edit engine relation to condition levers ( or i don't know how) Also i used Airedit to find some graph i could edit but same result i don't find the good one. I have to mix the propeller lever and the condition lever... Like majestic software Q300 did ! And then find out how to set rpm to the condition lever. example:

With power lever to IDLE ,

-if condition lever is to Fuel Off, engine stops
-Ground range , around 65 %
-Hi RPM, around 96 %
-between ground idle and hi rpm the handle reacts as a propeller lever (in flight)

maybe flight sim just can't simulate this but i know Majestic Software are able to use the condition lever as a propeller lever at the same time so there must be a way to make it hehe

G.F.
 
I belive it is not possible to do this with modifications of the .AIR or Aircraft.cfg file only.
I suppose only gauge programming could help.
 
ok i think that's it i have to learn about gauge editing now haha I have FS panel studio. When I right click on a XML gauge and Edit the gauge, where the name of the value comes from ? example:

Gauge
Element
Rotate
Value min
max
(A:TURB ENG1 MAX TORQUE PERCENT,PERCENT)

Where can i find the other adress like prop rpm or n1 n2 rpm and stuff like that ?
 
I'm not a gauge programmer but I think you will find a lot of informations on this matter in the panel and gauge SDK. Otherwise you could post your question in the panel design section of thir forum. Maybe can somebody help you.
 
jogman49 said:
Where can i find the other adress like prop rpm or n1 n2 rpm and stuff like that ?
Click to expand...

They are listed in the file "fsxsdk.chm" which is installed when you install the FSX SDK :)

Open it, then click "Core utilities Kit", then "Variables", then "Simulation variables".
 
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