******************************************************************************** Flight Dynamics for the Savoia Marchetti S.M.81 with Alfa Romeo 126/RC34 engines ******************************************************************************** [fltsim.0] title=SM81 AR126 Spain 1 sim=SM81_AR126 model= panel= sound= texture=sn_1 kb_checklists= kb_reference=SM81_AR126ref atc_id=1 ui_manufacturer=Savoia Marchetti ui_type=S.81 - Alfa Romeo AR126/RC34 engines ui_variation=Spanish Nationalist Air Force (A) atc_heavy=0 atc_airline= atc_flight_number= description=This was the final version of the S.81. Deployed from late 1936 it had the most powerful engines and the best performance. It was optimised for use as a medium level bomber within Europe, but had a secondary maritime patrol capability. About sixty five Alfa Romeo powered S.M.81s flew combat missions with the Spanish Nationalist Air Forces during the civil war. Skin by Manuele Villa, April 2008. [fltsim.1] title=SM81 AR126 Spain 2 sim=SM81_AR126 model= panel= sound= texture=sn_2 kb_checklists= kb_reference=SM81_AR126ref atc_id=21-42 ui_manufacturer=Savoia Marchetti ui_type=S.81 - Alfa Romeo AR126/RC34 engines ui_variation=Spanish Nationalist Air Force (B) atc_heavy=0 atc_airline= atc_flight_number= description=This was the final version of the S.81. Deployed from late 1936 it had the most powerful engines and the best performance. It was optimised for use as a medium level bomber within Europe, but had a secondary maritime patrol capability. About sixty five Alfa Romeo powered S.M.81s flew combat missions with the Spanish Nationalist Air Forces during the civil war. Skin by Manuele Villa, April 2008. [fltsim.2] title=SM81 AR126 202-5 sim=SM81_AR126 model= panel= sound= texture=202-5 kb_checklists= kb_reference=SM81_AR126ref atc_id=202-5 ui_manufacturer=Savoia Marchetti ui_type=S.81 - Alfa Romeo AR126/RC34 engines ui_variation=202nd Sq./40th Grp./38th Stormo B.T. atc_heavy=0 atc_airline= atc_flight_number= description=This was the final version of the S.81. Deployed from late 1936 it had the most powerful engines and the best performance. It was optimised for use as a medium level bomber within Europe, but had a secondary maritime patrol capability. This plane, based on Tirana's airport (Albania) during 1941, belonged to 202nd Sq./40th Grp./38th Stormo B.T. Skin by Manuele Villa, April 2008. [General] atc_type= atc_model= performance=Press F10 and then lowest icon for step by step on screen handling notes. [Views] eyepoint = 6.35, -0.85, 3 [WEIGHT_AND_BALANCE] empty_weight = 15907 ;including lubricating oil, flares, guns and ammunition max_gross_weight = 23157 Due to the very strong landing gear it was safe to land the S.81 at 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 parachutes station_load.1 = 2200, 0, 0, 0 ;normal bombload Moments of Inertia empty_weight_pitch_MOI = 120000 empty_weight_roll_MOI = 260000 empty_weight_yaw_MOI = 300000 empty_weight_coupled_MOI = 0.000 [fuel] Max fuel was 5765lbs = 961 USG modern unleaded AVGAS The real aircraft had eight tanks, six of which were between the engines. Outboard tanks were used only for overload maritime patrol. The S.81 had a maximum bomb load of 2,000Kg but the normal bomb load was half that which allowed 1820Kg of AVGAS to be loaded for a typical mission. When carrying the maximum possible bomb load of 2000Kg the maximum fuel load is 820Kg. Those who wish to complicate the roll and yaw handling can move the left right tanks a few feet either side of CoG. LeftMain = 0, 0, 0, 287, 0 RightMain = 0, 0, 0, 287, 0 Center1 = 0, 0, 0, 93, 0 //Center2 = 0, 0, 0, 294, 0 ;after removing all bombload remove the // to simulate overload maritime patrol mission with max auxiliary fuel fuel_type = 1 number_of_tank_selectors=1 electric_pump=0 [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 Alfa Romeo 126/R.C.34 TOGA = 780hp at 1.125 C2 and variable rpm below 3500 metres War Emergency = 780hp at 1.125 C2 and max 2400 rpm below 3500 metres (Combat) Rated Power = 750hp at 1.11 C2 and max 2300 rpm at 3400 metres METO = 680hp critical_altitude=11480 //War Emergency cylinder_displacement=194.78 compression_ratio=6.5 number_of_cylinders=9 max_rated_rpm=2400 //TOGA and War Emergency max_rated_hp=780 //TOGA and War Emergency fuel_metering_type=1 cooling_type=0 normalized_starter_torque=0.5 turbocharged=1 max_design_mp=33.66 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] propeller_type=1 propeller_blades=3 gear_reduction_ratio=1.53 propeller_diameter=12.9 propeller_moi=10 fixed_pitch_beta=20 beta_max=0 beta_min=0 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= 0.67 wing_area = 992.4 ;92.2 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 = 60 ;used for turret drag 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 hand pumped flaps. Technical manual has only caution against use at 'high' IAS. The pump would break and the flaps would 'stick'. More or less self resolving in real life as they were too difficult to hand pump at high IAS. Vfe nominally set at 250 KmIAS, but correct IAS for deployment of each stage much lower and specified within the handling notes. type= 1 span-outboard= 0.550 extending-time= 24 system_type= 3 flaps-position.0= 0,0 flaps-position.1= 13, 138 flaps-position.2= 19, 138 flaps-position.3= 38, 138 [Reference Speeds] flaps_up_stall_speed = 57 full_flaps_stall_speed = 49 cruise_speed = 170 max_indicated_speed = 170 Some care must be exercised to moderate profile drag (IAS) < 310 KmIAS (but especially when descending) to avoid structural failure of the tail. 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 = 0, 0 Nav.1 = 1, 0, 0 Nav.2 = 0, 0, 0 Adf.1 = 1 Adf.2 = 0 Transponder.1 = 1 Audio.1 = 1 Marker.1 = 1 [contact_points] //GEAR point.0 = 1, -40.67, 0, -3.1, 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 = 11 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 //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, -16.2, 0, 1, fx_vclight light.5 = 5, -6.45, 19.19, -2.87, fx_SM74_landing light.6 = 5, -6.55, -19.19, -2.87, 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 // no pich control max_bank=25 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 = 2 exit_rate.0 = 0.27 ;Percent per second exit_rate.1 = 0.5 ;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 = 12 generator_alternator_voltage = 12 max_generator_alternator_amps = 90 [flight_tuning] p_factor_on_yaw = 0.0 torque_on_roll = 0.0 gyro_precession_on_yaw = 0.0 gyro_precession_on_pitch = 0.0