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Flight Dynamics for the Savoia Marchetti S.73 with Alfa Romeo AR126/RC10 engines
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[fltsim.0]
title=S73 I-SAUL ver 2.0
sim=S73_AR126
model=isaul
panel=
sound=
texture=isaul
kb_checklists=
kb_reference=S73_AR126_ref
atc_id=I-SAUL
ui_manufacturer=Savoia Marchetti
ui_type=S73
ui_variation=Avio Linee Italiane
atc_heavy=0
atc_airline=
atc_flight_number=

description= Avio Linee Italiane was created as a subsidiary of Fiat in 1926. Apart from a domestic network radiating from Milan, a Munich service started in 1928 was extended to Berlin in 1931. Fiat ensured that ALI was the only Italian airline to survive the creation of Italy's national airline Ala Littoria in 1934. I-SAUL was one of six S.73s with Alfa Romeo AR126/RC10 engines ordered during 1937 which were soon used right across the ALI network. ALI began services to Paris soon after. Fiat airliners took over the Paris service when it was extended to London in 1938. Services were halted by Italy's entry into WW2.  

[fltsim.1]
title=S73 R.A. 605-3 ver 2.0
sim=S73_AR126
model=ARmil
panel=
sound=
texture=RA1
kb_checklists=
kb_reference=S73_AR126_ref
atc_id=605-3
ui_manufacturer=Savoia Marchetti
ui_type=S73
ui_variation=Regia Aeronautica, 605th Sqdn 148th G.Aut.
atc_heavy=0
atc_airline=
atc_flight_number=
description=Immediately after Italy's declaration of war (June 10, 1940) the Italian government seized approximately 180 airplanes from the main national airlines (Ala Littoria, L.A.T.I. and Avio Linee Italiane). Pilots, crews and technicians were absorbed by the Regia Aeronautica (Royal Italian Air Force). The SM.73s of Ala Littoria and Avio Linee Italiane based in Italy formed respectively the 605th and the 606th Squadriglia of 148th Gruppo Autonomo T (T for Trasporti). The 148th Grp. was employed on Greek-Albanian, North African and Russian fronts. This aircraft (former Ala Littoria’s I-SAUL, Cdr.Leone Dragone), based at Trapani (Sicily), was intensively employed on the Trapani - Tripoli route during September and October 1941.



[General]

atc_type=
atc_model=
performance= Press F10 and the lowest icon for step by step on screen handling notes. These late production S.73s were the first with powerful engines that could employ airline grade fuel. This was achieved by using a very weak supercharger. This variant was not compatible with high altitude runways. Nine were built. 

[Views]

eyepoint = 6.35, -0.85, 3

[fuel]

The real aircraft had eight small fuel tanks in the wooden wing structure with minimal offset from CoG to minimise roll and yaw inertia which were already high for that timeframe.

Maximum fuel load was 5880lbs of airline grade fuel. 

The S.73 had 18 passenger seats, but to allow use over the longest routes it flew in real life this FS9 release has reduced payload and the necessary fuel by default. 

LeftMain  = 0, 0, 0, 287, 0	
RightMain = 0, 0, 0, 287, 0	
Center1   = 0, 0, 0, 172, 0

fuel_type = 1                               
number_of_tank_selectors = 2                    
electric_pump=1

[WEIGHT_AND_BALANCE]


empty_weight     = 15870	;including oil, catering etc
max_gross_weight = 22950	;with Alfa Romeo manufactured Bristol Pegasus engines

Due to the very strong landing gear it was safe to land the S.73 at the original max gross after an emergency return. 

reference_datum_position     = 0, 0, 0
empty_weight_CG_position     = 0, 0, 0

station_load.0 = 1000, 0, 0, 0 	;5 crew with bags
station_load.1 = 1600, 0, 0, 0 	;8 pax with bags is max payload with 4480lbs of fuel.


Moments of Inertia

empty_weight_pitch_MOI   = 120000
empty_weight_roll_MOI    = 260000
empty_weight_yaw_MOI     = 300000 

empty_weight_coupled_MOI = 0.000         



[GeneralEngineData]

engine_type = 0
Engine.0 =  4.2, -9.6, -2.3
Engine.1 = 12.2,    0,  0
Engine.2 =  4.2,  9.6, -2.3
min_throttle_limit = 0.1                      
master_ignition_switch = 1  
fuel_flow_scalar = 1
		

[piston_engine]

The Savoia Hydromatic airscrews had no feathering. No de-icing other than pitot heat and carb heat. This engine had automixture in real life. Make sure automixture is selected ON in the FS9 realism screen before simulating operation of the S.73.

The Bristol Pegasus could develop emergency power, but only if a tank containing Super Octane fuel was selected. Consequently the potentially available emergency ratings for this Pegausus engine were irrelevant to Italian users of this aircraft prior to their surrender in 9/43. The Italian Co-belligerant Air Force probably did have access to super octane fuel after 9/43.

critical_altitude=2500

cylinder_displacement=194.78
compression_ratio=6.55
number_of_cylinders=9
max_rated_rpm=2415		//war emergency but rated at 2300
max_rated_hp=850		//TOGA but rated at 800

fuel_metering_type=1
cooling_type=0
normalized_starter_torque=3
turbocharged=1
max_design_mp=42.7		//TOGA
min_design_mp=0

emergency_boost_type=0
emergency_boost_mp_offset=0.000000
emergency_boost_gain_offset=0.000000
fuel_air_auto_mixture=0
auto_ignition=0
max_rpm_mechanical_efficiency_scalar=1.000000
idle_rpm_mechanical_efficiency_scalar=1.000000
max_rpm_friction_scalar=1.000000
idle_rpm_friction_scalar=1.000000

[propeller]

All Alfa Romeo 126/RC10 powered S.73s had Savoia Hydomatic two pitch screws. MSFS cannot simulate v/p screws it can only simulate constant speed or fixed pitch screws. If the supplied handling notes are followed performance and mission profile will closely approximate the real AR126/RC10 powered S.73 with these engines and screws.


propeller_type=1
propeller_blades=3
gear_reduction_ratio=1.53			
propeller_diameter=12.5				
propeller_moi=10	
fixed_pitch_beta=20			
beta_max=20					
beta_min=20					
prop_sync_available=0                         
prop_deice_available=0                       
prop_feathering_available=0    
prop_reverse_available=0                                    
min_rpm_for_feather=0                       
beta_feather=0.0                               
power_absorbed_cf=0                           
minimum_on_ground_beta=10.0				
minimum_reverse_beta=0                     
defeathering_accumulators_available=0            
prop_auto_feathering_available=0             
min_gov_rpm=650.000000
prop_tc=0.010000

low_speed_theory_limit=80.000000

[airplane_geometry]

oswald_efficiency_factor= 0.7	  

wing_area               = 1001		;93 square metres
wing_span               = 78.7		;24 metres	
wing_root_chord         = 16.9
wing_pos_apex_lon       = 3.25

wing_pos_apex_vert      = -2.500
htail_area              = 175.000
htail_span              = 20.000
htail_pos_lon           = -36.000
htail_pos_vert          = 0.000
htail_incidence         = 0.000
htail_sweep             = 40.000
vtail_area              = 81.200
vtail_span              = 10.000
vtail_sweep             = 45.000
vtail_pos_lon           = -36.000
vtail_pos_vert          = 3.400
elevator_area           = 75.000
aileron_area            = 37.100
rudder_area             = 37.000
elevator_up_limit       = 18.000
elevator_down_limit     = 15.000
aileron_up_limit        = 18.000
aileron_down_limit      = 18.000
rudder_limit            = 25.000
elevator_trim_limit     = 15.000

spoiler_limit           = 0
spoilerons_available    = 0
aileron_to_spoileron_gain = 0
min_ailerons_for_spoilerons = 0
min_flaps_for_spoilerons = 0
wing_dihedral           = 0
wing_incidence          = 0
wing_twist              = 0
wing_winglets_flag      = 0
wing_sweep              = 0

               
[Flaps.0]

Slow moving and probably very fragile flaps. The Vfe ratings below may be generous.

type= 1
span-outboard= 0.550
extending-time= 15			
system_type= 0

flaps-position.0= 0,0
flaps-position.1= 12, 111		;Vfe1 probably  200 KmIAS
flaps-position.2= 24, 97		;Vfe2 maybe     175 KMIAS
flaps-position.3= 38, 83		;Vfe3 probably  150 KmIAS

[Reference Speeds]

flaps_up_stall_speed    =  57		
full_flaps_stall_speed  =  49		
cruise_speed            = 180		;Design cruise at 5Km - econ cruise was 168 KTAS
max_indicated_speed     = 168		;this may be a generous estimate and needs to warn Vno not Vne due to the unpatched weather module bugs within FS9 which are only corrected by a registered copy of FSUIPC.

Some care must be excercised to moderate dynamic drag (IAS) < 310 KmIAS (but especially when descending) to avoid structural failure. Due to the high drag of the fixed gear this was not a material problem in real life. 



[Radios]


Com.1         = 1, 0
Com.2         = 1, 0
Nav.1         = 0, 0, 0		
Nav.2         = 0, 0, 0
Adf.1         = 1		;MFDF from delivery. 
Adf.2         = 0

Transponder.1 = 0		

Audio.1       = 1
Marker.1      = 1		;These aircraft would have had audio fan marker receivers 

[contact_points]


//GEAR
point.0 = 1, -40.67, 0, -2.9, 1200, 0, 1.01, 40, 0.3 , 2.5, 0.9 , 0, 0, 0, 0, 0
point.1 = 1,   1, -8.82, -10.8, 1600, 1, 1.98,  0, 0.4 , 2.5, 0.85, 0, 0, 2, 0, 0
point.2 = 1,   1,  8.82, -10.8, 1600, 2, 1.98,  0, 0.4 , 2.5, 0.85, 0, 0, 3, 0, 0

//SCRAPES
point.3= 2, -1.600, -39.000, 0.000, 800.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000,5.000, 0.000, 0.000
point.4= 2, -1.600, 39.000, 0.000, 800.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 6.000, 0.000, 0.000
point.5= 2, -44.100, 0.000, 0.81, 800.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 9.000, 0.000, 0.000
point.6= 2, 16.45, 0.000, -6.07, 800.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 4.000, 0.000, 0.000
point.7= 2, 7.64, -9.56, -8.25, 800.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 4.000, 0.000, 0.000
point.8= 2, 7.64, 9.56, -8.25, 800.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 4.000, 0.000, 0.000

static_pitch = 10
static_cg_height = 10.3
tailwheel_lock = 0


[brakes]
parking_brake    = 1     
toe_brakes_scale = 0.25  ;drum brakes at this date were ineffective and subject to fading


[hydraulic_system]
normal_pressure = 732.0     //PSI
electric_pumps  = 0         //no electric pumps
engine_map      = 1,1,0,0   //pumps on Eng1,2



[LIGHTS]
//Types: 1=beacon, 2=strobe, 3=navigation, 4=cockpit, 5=landing
light.0 = 3, -5.59, -39.13, 0.06, fx_navred
light.1 = 3, -5.59, 39.16, 0.1, fx_navgre
light.2 = 3, -44.06, 0, 0.87, fx_navwhi
light.3 = 4, 7.2, 0, 2.46, fx_vclight
light.4 = 4,  4.67,   1.5,  1.63, fx_vclight
light.5 = 5, 16.72, 0, -5.03, Newll  
light.6 = 5, 5.36, -0.71, -4.29, fx_SM74_landing
light.7 = 5, 5.36, 0.71, -4.29, fx_SM74_landing



[keyboard_response]
elevator =200, 1000
aileron  =200, 1000
rudder   =200, 1000

[direction_indicators]

direction_indicator.0=1,0
direction_indicator.1=2,0

[attitude_indicators]

attitude_indicator.0 = 1 
attitude_indicator.1 = 2 

[turn_indicators]

turn_indicator.0=2,0

[autopilot]
autopilot_available= 1
direction_indicator=1
attitude_indicator =0
default_pitch_mode=0
max_bank=3		//HDG hold by rudder trim
max_bank_acceleration=1
max_bank_velocity=3
default_bank_mode=2     
default_vertical_speed=0
autothrottle_available=0
pitch_takeoff_ga=8.000000
max_pitch=0
max_pitch_acceleration=0
max_pitch_velocity_lo_alt=0
max_pitch_velocity_hi_alt=0
max_pitch_velocity_lo_alt_breakpoint=0
max_pitch_velocity_hi_alt_breakpoint=0
max_throttle_rate=0.100000
nav_proportional_control=9.000000
nav_integrator_control=0.250000
nav_derivative_control=0.000000
nav_integrator_boundary=2.500000
nav_derivative_boundary=0.000000
gs_proportional_control=9.520000
gs_integrator_control=0.260000
gs_derivative_control=0.000000
gs_integrator_boundary=0.700000
gs_derivative_boundary=0.000000
yaw_damper_gain=0.000000


[forcefeedback]
ground_bumps_magnitude1=2600            ; 0 - 10000
ground_bumps_angle1=8900                ; 0 - 35999 degrees
ground_bumps_intercept1=5.0
ground_bumps_slope1=0.6
ground_bumps_magnitude2=1200            ; 0 - 10000
ground_bumps_angle2=9100                ; 0 - 35999 degrees
ground_bumps_intercept2=0.085
ground_bumps_slope2=0.65
crash_magnitude1=10000                  ; 0 - 10000
crash_direction1=01000                  ; 0 - 35999 degrees
crash_magnitude2=10000                  ; 0 - 10000
crash_direction2=9000                   ; 0 - 35999 degrees
crash_period2=75000                     ; in microseconds
crash_duration2=3500000                 ; in microseconds

[stall_warning]
type=1						;unlikely in real life

[exits]
number_of_exits = 1
exit_rate.0 = 0.27                               ;Percent per second

[EFFECTS]
wake=fx_wake
water=fx_spray
dirt=fx_tchdrt
concrete=fx_sparks
startup=fx_engstrt_jenny
touchdown=fx_tchdwn_s, 1


[electrical]
max_battery_voltage = 24
generator_alternator_voltage = 25
max_generator_alternator_amps = 100

[flight_tuning]

p_factor_on_yaw          = 0.01
torque_on_roll           = 0.01
gyro_precession_on_yaw   = 0.01
gyro_precession_on_pitch = 0.01