SiiNunit
{
physics_data: .phdata
{
	# Several changes have been made in v1.33:

	# - Suspension springing linearity curves recalibrated and made slightly progressive to simulate air springs
	# - Chassis suspension damping linearity curve recalibrated to simulate different compression and rebound behaviour
	# - Chassis suspension travel and working point recalibrated to mimic actual real-life parameters	
	# - Maximum steering lock increased slightly to calibrate trucks' turning circles
	# - Braking curve made more linear to better simulate actual braking behaviour at lower speeds
	# - Cabin suspension and damping reworked
	# - Cabin mass increased to 650kg for better simulation accuracy
	# - Wheel mass reduced for better accuracy
	# - Chassis suspension damping adjusted for better accuracy
	# - Trailer suspension reworked with resistant forces applied at the fifth wheel to replicate the effects of trailer chassis flex	
	
	# v1.35 Changelog:
	
	# - 4-point truck cab suspension
	# - Increased cab mass to 700kg (~the average mass of different cabs with different heights)
	# - Overhaul of trailer/truck weight distribution algorithm
	# - Better/more realistic weight distribution for tandem axles to improve traction
	# - Realignment of tyre collisions with their models to ensure that trucks/trailers roll more accurately
	# - Several bug fixes
	
	# Further physics improvements are constantly in the works to improve the driving simulation in-game.

	version: 2

	# These coeficients are used for computing autocentering wheel speed.
	# The faster vehicle moves and the more steering wheel is turned left or right
	# the higher autocentering speed is.
	# Given value of speed_coef is for 100km/h velocity (linear raise).
	# Given value of angle_coef is for maximum wheel turn (30degrees, linear raise).
	# Returning speed coeficient is computed by multiplication of both coeficients.
	# When result coeficient is 1, returning speed is exactly the same as full
	# turning speed. This balance points define natural limits of steering
	# dependent on vehicle speed.
	# Ratio_coef defines upper limit of result coeficient (ratio against player).

	steering_speed_coef:	4.0
	steering_angle_coef:	2.0
	steering_ratio_coef: 	0.97

	# Maximum allowed rotation of the front wheels (degrees)
	max_visual_rotation:	38
	
	# Modification of base steering sensitivity depending on truck speed.
	# Used only with relative steering (keyboard, joypad).

	steering_sensitivity_multiplier_0kmh:		1.0
	steering_sensitivity_multiplier_100kmh:		0.4
	steering_sensitivity_multiplier_minimum:	0.2
	steering_sensitivity_multiplier_maximum:	10.0

	# maximum allowed relative angles in degrees between truck and trailer joints
	fifth_wheel_pitch:		20
	fifth_wheel_roll:		3
	trailer_joint_pitch:		20
	trailer_joint_roll:		3
	spreader_joint_pitch:		5
	spreader_joint_roll:		3

	# brake strength
	brake_torque_factor:		1.0
	# how much stronger braking is at low speeds
	braking_curve_peak_rel:		2.0
	# where approx. the braking curve bends
	brake_characteristic_rpm:	250.0
	
	# front brakes are stronger by this factor
	brake_balance:			1.1
	
	# maximum brake temperature
	max_brake_temperature:		200.0
	# how much brakes cool down
	brake_cooling_rate:		0.05
	# how much brakes warm up
	brake_friction_warming_rate:	4.0

	cabin_max_pitch_angle_front:		1.95
	cabin_max_pitch_angle_rear:		1.95
	cabin_max_roll_angle:			1.95

	cabin_suspension_travel: 		0.10
	cabin_suspension_damping_factor: 	1.0
	cabin_sway_bar_factor: 			1.0
	cabin_cog_height_offset:		0.6

	cabin_mass: 				500.0
	wheel_mass: 				25.0

	# wheel suspension damping strength
	damping_scaling_front_factor: 		0.4
	damping_scaling_rear_factor: 		0.3
	damping_scaling_trailer_factor: 	0.6

	# anti-roll/sway-bar stiffness (only applies to the front axle)
	sway_bar_stiffness_factor:		1.0
	
	# intensity of engine braking (not motor brake)
	thrust_characteristic_viscosity_factor:		1.0
	# transmission resistance
	transmission_viscosity_factor:			1.0
	# retarder resistance
	transmission_viscosity_retarder_factor:		0.15
	# rotational wheel resistance
	wheel_viscosity_factor:				0.30
	# clutch strength
	clutch_viscosity_factor:			1.0
	clutch_connected_viscosity_factor:		1.0
	manual_clutch_viscosity_factor:			0.5
	manual_clutch_connected_viscosity_factor:	10.0
	# torque converter strength
	torque_converter_viscosity_factor:		0.2
	torque_converter_locked_viscosity_factor:	10.0
	# relative magnitude of flywheel inertia
	inertia_scaling_const:				1.0
	# transmission inertia relative to the flywheel
	transmission_rel_flywheel_inertia:		0.5

	# approximate air resistance: resistant_force = air_resistance * sqr(speed)
	air_resistance:					3.0

	# friction parameters
	# stiffness of tyre material
	bristle_stiffness_longitudinal_factor:		0.8
	bristle_stiffness_lateral_factor:		0.8
	# damping of tyre deformation
	bristle_damping_longitudinal_factor:		0.8
	bristle_damping_lateral_factor:			0.8
	# coefficients related to wheel slipping
	slip_longitudinal_factor:			1.25
	slip_lateral_factor:				1.40
}	
}