From Silent Wings Wiki
An optional engine can be defined if the aircraft you are modelling is a motorglider or a towplane.
The mathematical engine model is based on a 4-stroke non-turbocharged engine.
This is an engine.dat example:
# Propeller/engine position position = [ 1.50 0.0 0.0 ] # Motor cowling drag cd = 0.10 ref_area = 1.0 # Nominal power [W] power = 69000.0 rpm = 5100.0 rpm_max = 5800.0 # Propeller data prop_diameter = 1.615 prop_pitch = 85.0 prop_chord = 0.4 prop_cd = 0.02 prop_blades = 2 prop_gear_ratio = 2.43 # Show more data on the HUD debug = true
If you want more information on the HUD while fine-tuning the engine, set the debug = true option. You can remove this again before you release your model to the public.