Question about boosting piston engine performance in aircraft.cfg

[kalizzi]

Hello

 

Was wondering how to increase engine power with a piston engined aircraft. I know with jets, increasing the "static_thrust=" value usually works, but with a piston engine, I don't know which variable I can increase to get more power. is it the "max_rated_hp="?  I list hereunder an example of the Piston Engine section of Aircraft.cfg file.  So many variables than can impact the performance of the piston engine. such as cylinder_displacement= ,compression_ratio=,  number_of_cylinders=, max_rated_rpm=,  and finally max_rated_hp=. Any help would be appreciated, (Charlie are you there?)

 

 

[piston_engine]
cylinder_displacement=122.04748      //Cubic inches per cylinder displacement./
compression_ratio=6.50000            //Compression ratio of each cylinder. / 
number_of_cylinders=14               // number of cylinders in the engine.
max_rated_rpm=2540.00000             //Maximum rated revolutions per minute (RPM) of the engine (red line)./ 
max_rated_hp=875.01685
fuel_metering_type=2
cooling_type=0
normalized_starter_torque=0.10600
turbocharged=1
max_design_mp=48.00100
min_design_mp=12.00000
critical_altitude=32808.30000
emergency_boost_type=3
emergency_boost_mp_offset=-0.24001
emergency_boost_gain_offset=-0.03122
fuel_air_auto_mixture=0
auto_ignition=0
max_rpm_mechanical_efficiency_scalar=1.00000
idle_rpm_mechanical_efficiency_scalar=1.00000
max_rpm_friction_scalar=1.00000
idle_rpm_friction_scalar=1.00000
emergency_boost_duration=0.00000
BestPowerSpecificFuelConsumption=0.52000
detonation_onset=67.10099
power_scalar=1.00000

[tiger1962]

The quickest and easiest figure to change is the power_scalar, because that's what all the x_scalar values are there for - you can increase all the related values at once.

Try changing the power_scalar=1.00000 at the bottom of the [piston_engine] list to power_scalar=1.50. This will change the power output from 100% to 150%, which should make quite a difference! If it's too much, scale it back to 1.25. If it's not enough, increase it to 1.75, and so on until it 'feels' right to you.

[kalizzi]

Thank you Tim I'll give that a try. 

 

Best wishes. 

 

Khalid