MSFS20 Aircraft speed - deploying flaps /

[Hawk_101]

Hello,
I'd like to know, please, if it's possible to deploy the flaps at a higher speed.
For example, for an certain aircratf, they deploy only under 160 knt
Is it possible to raise it to 220 knt ?
Another question : what exactly is doing " elevator_elasticity_table and aileron_elasticity_table " ?
Which values are the most important, if I'd try to edit them ?
Here is the elevator_elasticity_table for the Corsair F4U
0.000000:1.000000, 313.314854:1.000000, 515.795217:0.666667, 718.281655:0.333333, 920.762019:0.000000
Thank you

 

[WarpD]

If you don't know what the content of a table does, why are you thinking you should be changing it? That makes no sense, to be honest.
As for flaps... check for a max speed setting in the flaps settings. It existed in FSX.

 

[Hawk_101]

Here is the Flaps settings

[FLAPS.0]
type=1
system_type=3
span-outboard=0.5
extending-time=5
altitude-limit=-1
damaging-speed=201
blowout-speed=305
maneuvering_flaps=0
lift_scalar=1.2
drag_scalar=1
pitch_scalar=-1
max_on_ground_position=5
delay_between_flap_index=0
flaps-position.0= 0, -1, 1, 1, 1, 0, 0
flaps-position.1= 10, 200, 1, 1, 1, 0, 0
flaps-position.2= 20, 180, 1, 1, 1, 0, 0
flaps-position.3= 30, 160, 1, 1, 1, 0, 0
flaps-position.4= 40, 140, 1, 1, 1, 0, 0
flaps-position.5= 50, 130, 1, 1, 1, 0, 0
[FLAPS.1]
type=2
system_type=3
span-outboard=0.5
extending-time=5
altitude-limit=-1
damaging-speed=201
blowout-speed=305
maneuvering_flaps=0
lift_scalar=0
drag_scalar=0
pitch_scalar=0
max_on_ground_position=5
delay_between_flap_index=0
flaps-position.0= 0, -1, 1, 1, 1, 0, 0
flaps-position.1= 10, 200, 1, 1, 1, 0, 0
flaps-position.2= 20, 180, 1, 1, 1, 0, 0
flaps-position.3= 30, 160, 1, 1, 1, 0, 0
flaps-position.4= 40, 140, 1, 1, 1, 0, 0
flaps-position.5= 50, 130, 1, 1, 1, 0, 0

Does the 200, 180, 160, 140, 130, on the bottom - flaps-position values, means speed ( knt ) ? I hope so

 

[Hawk_101]

I modified all those values ( increased ) but is not working
max_flaps_extended=160 as well, I increased but no luck

 

[WarpD]

Since this is for MSFS2020... I don't know that any of those entries are being used.

 

[B21-soaring]

I don't think there is a MSFS parameter you can set which prevents the flaps being used above a defined speed (just damage thresholds). You mean you click 'flaps down' and nothing happens? Possibly there's additional code in the plane which is controlling the flaps. Which plane is it - are the MilViz Corsair files readable?

MSFS currently supports 3 numbers per flap position: extension (degrees), damage speed (knots), drag modifier (0..1) - documented here. I have damage turned off so I've never checked the middle parameter (my planes have it at -1) but I use the drag modifier a lot.

Elevator elasticity is a sequence of number pairs: (dynamic pressure psf):(elevator effectiveness 0..1) - Dynamic pressure can be read in the MSFS SDK menu Options - Aircraft - Speed.[/ICODE]

 

[Roy Holmes]

The last thing I would worry about at 920 kts in a Corsair F4U is elevator elasticity.
Roy

 

[Hawk_101]

I just wanted to find a way to slow down the aircraft.
It's a ww2 bird and there is no speed brake
The real pilots did use the gears to slow down the aircraft, AFAIK

 

[Roy Holmes]

The way to slow down a piston prop airplane is to close the throttle. The prop drag acts like a speed brake and its Mach drag limits speed to about Mach 0.3.
What I was getting at was that 920 kts IAS is a stupid value for anything like that airplane. It would have been in bits way before reaching that speed. If it comes to that, 920 kts is probably higher than any jet IAS limit.
Roy

 

[Hawk_101]

Thank you
Should I try to lower the 920 kts ?

 

[WarpD]

You shouldn't change anything unless there's actually a reason to do so. Since the aircraft will never reach that airspeed, that entry doesn't matter. Not to mention, there doesn't appear to be anything wrong with the elevator's behavior.

 

[Hawk_101]

I tried to modify some values, the aircraft feels, for me, at least, amazing. Didn't touch the 920 kts stuff.
Only the MOI, weight, etc
I always have a backup, just in case
But, when I'm on the ground, the back wheel does not touch the ground.
I'm still testing, reading about this, I'm just a beginner
Flying with the default settings, for almost every single aircraft, it's a question of past.

 

[bstolle]

I just wanted to find a way to slow down the aircraft.
It's a ww2 bird and there is no speed brake
The real pilots did use the gears to slow down the aircraft, AFAIK

Looks like you are talking about the Milviz Corsair. IRL the main landing gear is the speed brake, isn't it the same with the Milviz version?
I'm not aware of any aircraft where you are using the flaps as speedbrakes (in flight)
Why are you playing with the MOI values and weight? Do you have experience with the real one? Modifying these values can be the reason why the tailwheel doesn't touch the ground anymore.

Concerning slowing down. Flying level also helps a lot with decelerating.

 

[Hawk_101]

Yes, I modified the MOI and the weight, far from perfect but it feels way better than the default
I'll keep testing, hopefully I'll fix the issue with the tailwheel

 

[WarpD]

Ok.. so you're messing with flight dynamics (not knowing WHAT you're actually doing) on an aircraft I am 99.99% certain you've never actually flown in real life and claiming your changes are better??? LOL Gotta admit... THAT'S a new one.

I mean, it's one thing to try to learn what settings do... but to make claims that you're improving an aircraft that you've got zero actual real life air time in? That's... well, astounding.

 

[Hawk_101]

LOL
Everyone on this forum must be a real pilot
You're a funny guy ( Good Fellas )
LOL

 

[WarpD]

I'm not talking about being a real pilot as much as being someone who's flown an actual Corsair. Most of us aren't pilots, but we study flight dynamics (using expensive books) and we stay at a Holiday Inn Express from time to time. That always helps.
As for Good Fellas... careful... I've got Joisey "connections" (means I've driven through it at least once!).

Out of curiosity, why did you change the MOI?

 

[Roy Holmes]

Unless you are just exploring what happens when a fundamental parameter like weight is changed, you should not change it. Most of the stuff in the aircraft config file or its 2020 equivalent is probably based on known facts and is the place to start when developing flight dynamics of a sim model from scratch.
There are some things that do affect performance like wing area and some things that are advisory like flap speeds (if you have damage selected).
Starting with those fundamentals you should move on to the basic aerodynamics properties like lift vs angle of attack, drag in all its forms, thrust variation with speed and control coefficients. Those are usually specified in data tables.
At that point if you have detailed performance charts and handling notes you should try to match your model to them. That can easily take 6 months to achieve. There are programs that can calculate how your model performs in the sim and they greatly help in time spent and accuracy of data gathering. They do not tell you how the airplane handles and that is where experience whether real or from similar type sim models plays a subjective part. Handling is complicated.
Then you have the situation where there is no data available, typically for new military types. Since these have programmed performance and handling to render acceptable performance. My approach has been to make them fly like something similar that I knew well. That is where real flight experience helps. You can make your model easy to fly and have no restrictions on what you want from it.
My point is that one should try to make a model perform like the real one does given how much data is available. Only change one parameter at a time and document what you did and what the result was.
Roy

 

[Hawk_101]

I'm not talking about being a real pilot as much as being someone who's flown an actual Corsair. Most of us aren't pilots, but we study flight dynamics (using expensive books) and we stay at a Holiday Inn Express from time to time. That always helps.
As for Good Fellas... careful... I've got Joisey "connections" (means I've driven through it at least once!).

Out of curiosity, why did you change the MOI?

MOI? Because the aircraft feels much better
I don't understand why people react so angry
It's just a flight simulator. I have a backup of the default files

 

[bstolle]

MOI? Because the aircraft feels much better

It's just a flight simulator.

Again, how do you know the Corsair should 'feel'?

Exactly. Changing something simply because you don't like the feel doesn't belong to flight model modifications/design in a flight sim.

btw. nobody is angry.