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jcomm

Roll rate / inertia....

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Probably the only nice FM feature I experienced in MFS after SU6 was the fix to the Legacy-inherited roll rate / inertia limit that was capping the roll rate on aircraft with really hig rates of roll and low roll inertia, like the Extra 300 and so on...

Recently MFS allowed for a much more realistic response of these aircraft to stopping a fast aileron roll.

Would be great if LM could update their FDE too, clearing whatever has been prebventing a roll from being "stopped" like in :

 

 


Flight simulation is the virtual materialization of a Dream....

 

 

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I use to tune my aircrafts.cfg to a better behavior based on my real experiencie.

Always with a nice result. 

This is my Feelthere E-jet E190

[flight_tuning]
cruise_lift_scalar                                               = 1.00
parasite_drag_scalar                                             = 1.00
induced_drag_scalar                                              = 1.00
elevator_effectiveness                                           = 1.40
aileron_effectiveness                                            = 0.60
rudder_effectiveness                                             = 1.00
pitch_stability                                                  = 1.00    
roll_stability                                                   = 1.20
yaw_stability                                                    = 1.00
elevator_trim_effectiveness                                      = 1.00    
aileron_trim_effectiveness                                       = 1.00
rudder_trim_effectiveness                                        = 1.00

 


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28 minutes ago, TadeuPrimo said:

I use to tune my aircrafts.cfg to a better behavior based on my real experiencie.

Always with a nice result. 

This is my Feelthere E-jet E190


[flight_tuning]
cruise_lift_scalar                                               = 1.00
parasite_drag_scalar                                             = 1.00
induced_drag_scalar                                              = 1.00
elevator_effectiveness                                           = 1.40
aileron_effectiveness                                            = 0.60
rudder_effectiveness                                             = 1.00
pitch_stability                                                  = 1.00    
roll_stability                                                   = 1.20
yaw_stability                                                    = 1.00
elevator_trim_effectiveness                                      = 1.00    
aileron_trim_effectiveness                                       = 1.00
rudder_trim_effectiveness                                        = 1.00

 

Interesting.

Do you have any thoughts about the flight tuning for the E-170, E-175 and E-195?
Or indeed any other aircraft that you have experience on?


Ryzen 3700X 4.4GHz(PBO); MSI RTX 3080 Ti VENTUS 3X; 32GB Corsair 3200 MHz; ASUS VG35VQ 35" (3440x1440)
Fulcrum Sim yoke; Thrustmaster TCA Captain Pack Airbus edition; MFG Crosswind rudder pedals; CP Flight MCP 737; Logitech FIP x2; TrackIR

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iFly Advanced 737; PMDG 777; QW 787; AS A320+A330; MJC Dash 8; A2A C172 PA-28; Carenado A42+A72+XL560; PMDG 737; FT E-Jets v3; QW 757; JF C152

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You should get the MOI right before tweaking the flight tuning scalar values.  The stock FS formula usually results in values that are too low.

The best way to determine the MOI is to use this formula from Tom Goodrick:

IX(roll) = ((RX * b)^2) / 4) * BOW / 32.2
IY(pitch) = ((RY * L)^2) / 4) * BOW / 32.2
IZ(yaw) = ((RZ * M)^2) / 4) * BOW / 32.2

where b=span. L=length, M=(b+L)/2 and BOW is basic operating weight for large aircraft or empty weight for small aircraft.

To get the values of RX, RY and RZ, look them up in the following table:

Aircraft_____BASICS SHAPE________RX___RY____RZ
747________Jet 4-eng on wing____0.332_0.380_0.508
737________Jet 2-eng on wing____0.264_0.456_0.517
DC-9_______Jet 2-eng on fuselage_0.242_0.360_0.435
727________Jet 3-eng on fuselage_0.247_0.442_0.518
Cessna 172__1-eng high wing_____0.242_0.386_0.403
Beech Bonan_1-eng low wing______0.248_0.338_0.393
Beech Baron__light twin__________0.260_0.329_0.399
DHC6 T Otter__twin turbo_________0.203_0.326_0.350
Cessna 550___light biz jet________0.243_0.400_0.447
Martin 404____twin radial_________0.272_0.378_0.444
DC-6_________four radial_________0.322_0.324_0.456

Dave

 


Simulator: P3Dv5.2

System Specs: Intel i7 9700K 4.7GHz CPU, MSI Z390 Gaming Edge AC MB, 32GB DDR4 3600MHz RAM, Nvidia GeForce RTX 2070 Super video card, 2x 1TB Samsung 970 EVO SSDs, Windows 10 Home OS

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The problem with the laggy instead of sudden ailero roll stops has to do with an internal legacy limit on how much degree ( actually radian ) per second the FDE can process.

ASOBO has cleared the throttled roll rate in a recent MFS update and now their Extra and Pitts stop the rolls like in their RW counterparts.


Flight simulation is the virtual materialization of a Dream....

 

 

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