Ito's Fury....is there a flight dynamics update?

O

OBIO

Retired SOH Admin
Has anyone done a new set of file to get Ito's FJ-1 Fury flying better? I have had this vintage Navy jet installed for some time, but just now took it for its first flight...and I felt like a martini...shaken, shaken a lot. And the speed was super crazy.

OBIO
 
Try this one. My approach is a bit back door-ish but the outcome seems ok. By that I mean I have no special software to do this, its all CFG manips. I worked on the contact points, engine output, inertias, added working flaps with an extra notch, a flight dynamics parameter set, a "ballast" for trim requirements, angled the panel view down a bit so you can just barely see the cables for carrier landings (downside is a bit less sky to see when S&L) but the panel was so huge it seemed reasonable.
It seems the CG is right over the main gear so getting those points to visually work was impossible without the plane squatting on its tail bone. Takeoff roll with one notch flaps is about 130, landing speed dirty is about 120, top speed S&L about 550. Literature says top speed is 600+. I think it is better but I may just be tweaking to my older stick. Let me know what you think. Can't upload so here it is.

[fltsim.0]
title=FJ-1 Fury Clean
sim=FJ-1 Fury
model=CLN
panel=
sound=
texture=
kb_checklists=
//ui_manufacturer=ƒAƒƒŠƒJŠCŒR ƒWƒFƒbƒg‹@
//ui_type=North American FJ-1 Fury
ui_manufacturer=North American
ui_type=FJ-1 Fury
ui_variation=No.104 Clean
description=This was a single-engine, single-seat, low-wing carrier-borne jet fighter with short stubby wings looking much like a high-flying bomb.\nIts first flight was in 1947. \nAnd because its performance was disappointing only 31 were built and it had a brief service life.\n\nby Kazunori Ito\n KazuIto0926@aol.com\n

[fltsim.1]
title=FJ-1 Fury with Tank
sim=FJ-1 Fury
model=TNK
panel=
sound=
texture=
kb_checklists=
//ui_manufacturer=ƒAƒƒŠƒJŠCŒR ƒWƒFƒbƒg‹@
//ui_type=North American FJ-1 Fury
ui_manufacturer=North American
ui_type=FJ-1 Fury
ui_variation=No.104 with Wingtip Tank
description=This was a single-engine, single-seat, low-wing carrier-borne jet fighter with short stubby wings looking much like a high-flying bomb.\nIts first flight was in 1947. \nAnd because its performance was disappointing only 31 were built and it had a brief service life.\n\nby Kazunori Ito\n KazuIto0926@aol.com\n

[General]
performance=Wingspan: 38 feet 2 inches (11.63 m)\nLength: 34 feet 5 inches (10.48 m)\nHeight: 14 feet 10 inches (4.52 m)\nWing area: 221 square feet. (20.5sqm)\n\nEmpty Weight: 8,843-lb. (4010 kg)\nTake-off Weight with two 170-gallon wing tip tanks: 15,115-lb. (6854 kg) \n\nPower plant: Allison J35-A-2 of 4000 lb. thrust\n\nMaximum speed: 547 mph at 9,000 feet. (880 km/h at 2743 m)\nStalling speed: 121 mph. (194 km/h) \nInitial rate of climb: 3,300 feet per minute. (1005 m/min) \nService ceiling: 32,000 feet.(9753 m) \nRange: 1,496 miles (with external tanks). (2407 km)\n\nArmament: Six .50-calibre machine guns with 1,500 rounds total\n

[WEIGHT_AND_BALANCE]
reference_datum_position=0.000000,0.000000,0.000000
empty_weight_CG_position=0.000000,0.000000,2.000000
max_number_of_stations=50
station_load.0=300.000000,3.000000,0.000000,0.000000
empty_weight=10590.000000
empty_weight_roll_MOI=12463.000000
empty_weight_pitch_MOI=26273.000000
empty_weight_yaw_MOI=26774.000000
empty_weight_coupled_MOI=3000.000000
max_gross_weight=16335.000000

[airplane_geometry]
wing_area=280.000000
wing_span=37.083333
wing_root_chord=7.750000
wing_dihedral=0.8000000
wing_incidence=-0.494385
wing_twist=1.999023
oswald_efficiency_factor=5.021642
wing_winglets_flag=0
wing_sweep=0.000000
wing_pos_apex_lon=0.000000
wing_pos_apex_vert=0.000000
htail_area=47.000000
htail_span=14.166667
htail_pos_lon=-16.333333
htail_pos_vert=0.000000
htail_incidence=0.000000
htail_sweep=0.000000
vtail_area=40.000000
vtail_span=7.211103
vtail_sweep=0.000000
vtail_pos_lon=-16.333333
vtail_pos_vert=5.833333
elevator_area=13.500000
aileron_area=12.720000
rudder_area=5.950000
elevator_up_limit=28.647890
elevator_down_limit=28.647890
aileron_up_limit=17.761692
aileron_down_limit=17.761692
rudder_limit=22.918312
elevator_trim_limit=19.480565
spoiler_limit=59.988681
spoilerons_available=0
aileron_to_spoileron_gain=0.000000
min_ailerons_for_spoilerons=0.000000
min_flaps_for_spoilerons=0.000000

[Flight_tuning]
cruise_lift_scalar=0.75
parasite_drag_scalar=0.95
induced_drag_scalar=1.4
elevator_effectiveness=1.4
aileron_effectiveness=1.0
rudder_effectiveness=0.8
pitch_stability=1.1
roll_stability=1.0
yaw_stability=1.0
elevator_trim_effectiveness=1.00
aileron_trim_effectiveness=1.00
rudder_trim_effectiveness=1.00

[fuel]
Center1=0.000000,0.000000,0.000000,217.000000,0.000000
LeftMain=0.000000,0.000000,0.000000,109.000000,0.000000
LeftAux=0.000000,-5.000000,0.000000,120.000000,0.000000
RightMain=0.000000,0.000000,0.000000,109.000000,0.000000
RightAux=0.000000,5.000000,0.000000,120.000000,0.000000
fuel_type=2.000000
number_of_tank_selectors=1
electric_pump=0

[contact_points]

point.0=1, 15.58, 0.00, -6.95,1574, 0.00, 0.18, 45.78, 0.08, 2.50, 0.80, 5.00, 5.00, 0.00,0.00,0.00

point.1=1, -0.75,-8.00, -6.95,1574, 1.00, 0.61, 0.00, 0.63, 2.50, 0.39, 7.00, 7.00, 2.00,0.00,0.00

point.2=1, -0.75, 8.00, -6.95,1574, 2.00, 0.61, 0.00, 0.63, 2.50, 0.39, 5.00, 5.00, 3.00,0.00,0.00

point.3=2.000000,0.000000,-15.583333,0.666667,1574.803150,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,5.000000,0.000000,0.000000
point.4=2.000000,0.000000,15.583333,0.666667,1574.803150,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,6.000000,0.000000,0.000000
point.5=2.000000,-15.666667,0.000000,-0.166667,1574.803150,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,9.000000,0.000000,0.000000
point.6=2.000000,8.000000,0.000000,0.166667,1574.803150,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,4.000000,0.000000,0.000000
static_pitch=0.000000
static_cg_height=7.000000
gear_system_type=0

[LIGHTS]
//Types: 1=beacon, 2=strobe, 3=navigation, 4=cockpit, 5=landing
//6=taxi light, 7=recognition light, 8=wing light, 9=logo light
// Z, X, Y
light.0=3, 4.33, 17.81, -0.92, fx_navgre ,
light.1=3, 4.33, -17.81, -0.92, fx_navred ,
light.2=3, -0.26, 0.00, 3.12, fx_beacon ,
light.3=3, -17.06, 0.00, 1.35, fx_navwhi ,




[Flaps.0]
type=1
span-outboard=0.500000
extending-time=5.000000
system_type=0
lift_scalar=1.60
pitch_scalar=-0.10
drag_scalar=1.50
flaps-position.0=0.000000,0.000000
flaps-position.1=8.000000,0.000000
flaps-position.2=24.996227,0.000000
flaps-position.3=39.992454,0.000000

[GeneralEngineData]
engine_type=1
Engine.0=-6.666667,0.000000,0.000000
fuel_flow_scalar=1.000000
min_throttle_limit=0.000000

[jet_engine]
thrust_scalar=1.2

[TurbineEngineData]
fuel_flow_gain=0.002170
inlet_area=7.102080
rated_N2_rpm=29920.000000
static_thrust=4920.000000
afterburner_available=0
reverser_available=0

[Reference Speeds]
flaps_up_stall_speed=144.000000
full_flaps_stall_speed=115.200000
cruise_speed=415.074629
max_indicated_speed=695.000000
max_mach=1.100000

[keyboard_response]
elevator=150.000000,250.000000
aileron=150.000000,250.000000
rudder=150.000000,250.000000

[Views]
eyepoint=8.202000,0.000000,3.307000

[autopilot]
autopilot_available=0
flight_director_available=0

[direction_indicators]
direction_indicator.0=3,0

[TailHook]
tailhook_length=4.32
tailhook_position=-7.66, 0.00, -2.57
cable_force_adjust=1.0

[Exits]
number_of_exits=2
exit_rate.0=0.3
exit_rate.1=0.3

[EFFECTS]
wake=fx_wake
water=fx_spray
dirt=fx_tchdrt
concrete=fx_sparks
touchdown=fx_tchdwn, 1



[brakes]
toe_brakes_scale=1.000031
parking_brake=1

[gear_warning_system]
gear_warning_available=0
pct_throttle_limit=0.000000
flap_limit_power=0.000000
flap_limit_idle=0.000000

[hydraulic_system]
normal_pressure=0.000000

[stall_warning]
type=1

[attitude_indicators]
attitude_indicator.0=1

[turn_indicators]
turn_indicator.0=1,0

 
Ok, loaded this into the cfg. . .loaded the aircraft onto the deck of the Eisenhower and it proceeded to sit back on it's exhaust. I suspect something isn't right here, lol. Gonna overwrite with the original cfg for now.
 
Yeah I know it did that to me too at first-DOH, but when I thrust it level it works fine the rest of the time. As I said I like the visual of having the wheels match up with the dirt kick and also not having them lift off the ground when rotating. The original has them way back but it sits on the ground. I'll move them back some more but it will just mean more aft trim to rotate. It'll just have to look and taxi a bit off. Copy these lines into the contact point entry and she'll stop her begging.

point.0=1, 15.58, 0.00, -6.95,1574, 0.00, 0.18, 45.78, 0.08, 2.50, 0.80, 5.00, 5.00, 0.00,0.00,0.00
point.1=1, -0.90,-8.00, -6.95,1574, 1.00, 0.61, 0.00, 0.63, 2.50, 0.39, 7.00, 7.00, 2.00,0.00,0.00
point.2=1, -0.90, 8.00, -6.95,1574, 2.00, 0.61, 0.00, 0.63, 2.50, 0.39, 5.00, 5.00, 3.00,0.00,0.00
 
Gentlemen,

I would also like to recommend some changes to help with this issue:

In the Airplane Geometry section:
wing_pos_apex_lon=2.100000

This sets CoG at 27% MAC.

Contact Points for gear only:


point.0=1, 15.7, 0.00, -7.25,1574, 0.00, 0.68, 45.78, 0.3, 2.00, 0.80, 5.00, 5.00, 0.00,0.00,0.00

point.1=1, -1.75,-8.00, -6.95,1574, 1.00, 0.61, 0.00, 0.63, 2.00, 0.39, 7.00, 7.00, 2.00,0.00,0.00

point.2=1, -1.75, 8.00, -6.95,1574, 2.00, 0.61, 0.00, 0.63, 2.00, 0.39, 5.00, 5.00, 3.00,0.00,0.00

This really improves suspension, changes the size of the nose wheel from tiny to normal, and loads the aircraft in the sim at the proper pitch and height. The nose gear had 1" of suspension (way too hard) and the main gear were a bit hard. Unfortunately, very little nose gear suspension is animated in th evisual model so you will have to tolerate a little nose sink under hard braking but it is worth it.

At the bottom of the contact point section, change to these:
static_pitch=2.200000
static_cg_height=6.7500000


The flaps could use a little more lift but I would prefer to do that in the air file (and will if you like).

I hope this helps.
 
I ALWAYS like the help so pardon if I milk this a little.

CoG at 27% MAC. Is this Center of Gravity or Center of Lift, and what is MAC?

static_pitch=2.200000, static_cg_height=6.7500000. What do these lines affect?

I really appreciate the learning I get at SOH!
 
aeromed202 said:
I ALWAYS like the help so pardon if I milk this a little.

CoG at 27% MAC. Is this Center of Gravity or Center of Lift, and what is MAC?

static_pitch=2.200000, static_cg_height=6.7500000. What do these lines affect?

I really appreciate the learning I get at SOH!
Click to expand...

CoG is normally set at 25% of the Mean Aerodynamic Wing Cord (or 25% rearward of the wing's leading edge; usually the thickest part of the wing). This is not always CoL but in FS, it is usually the same. Actually you can control CoL to be different and if slightly rearward, would give you a faster setup although with a little nose trim necessary.

Static Pitch is the body Angle of Attack sitting on the ground. This is how FS loads the aircraft initially so it should be set so that all gear is equidistant from the surface so you do not have a bouncing fore-aft load.

Static height is the distance from the ground to the reference point and determines how the aircraft will load in the sim, or the height at which the aircraft will lift when in SLEW mode.

You should set this at 1-4 inches above ground with gear "compressed" at static compression, or at ground level with gear "hanging". If too high, the aircraft falls to the surface, if too low, the aircraft will spring into the air (especially if static pitch is way off you will get a fore/aft bounce).
 
Milton

I know you are busy with other projects and that annoying thing called everyday life, but if you would do up a nice air and config file combo for Ito's Fury, I will name the very next pet I bring home after you (can't have kids, so a pet in named after you is the best I can offer_.

OBIO
 
I can make a few adjustments for you to the flap lift and drag (already changed and tested) and playing with moving the CoG reference forward and then adjusting all other related stuff. This is done but still unhappy with some things. I am not much on fighter jets but this has some qualities in the air; I just dislike the ground ops.
 
FM is ready for ya OBIO ... check your PM's.

Much improvement in ground ops, v2, and approach lift and drag.
 
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