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Turbines

mirage3

mirage3

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Anyone does know how to modify the aircraft.cfg to reduce power of a PT6A turbine from 950 shp to 750 shp?
Thanks to who will help me!!:sly:

Miro
 
mirage3 said:
Anyone does know how to modify the aircraft.cfg to reduce power of a PT6A turbine from 950 shp to 750 shp?
Thanks to who will help me!!:sly:

Miro
Click to expand...
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Note: The following number are used STRICTLY for example purposes and were derived from a sample file:

Now, in the .cfg file, you should see the following:

[turboprop_engine]
power_scalar=1.0 //Scalar on Turboprop power
maximum_torque=2300 //Maximum torque available (ft-lbs)

You should adjust the power scalar from THE ORIGINAL VALUE to a scalar of 750/950 = 0.79.

If the original power scalar is 0.9, the new scalar is 0.71.
If the original power scalar is 1.0, the new scalar is 0.79.
If the original power scalar is 1.1, the new scalar is 0.87.
and so forth ...

Now to adjust the Torque number ------

Horsepower = Torque x RPM / 5252, therefore, Torque = ((5252)/RPM))x(HP)

Since you are NOT changing the RPM speed of the powerplant, the value (5252/RPM) would be the same
constant for both HP figures. Therefore, you would ADJUST the Torque number by the same scalar factor
as the HP figure.

For the NEW HP figure, Maximum Torque = 2300 x 0.79 = 1817 (for the 750 SHP figure).

Hope it helps.
 
Because, i am modifying the IRIS PC-9M to a PC-7MkII, the fuselar is the same, but the power is reduced!
 
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