Modifications to various drag and thrust parameters, not a major overhaul of the original FDE by CS which is already excellent.

Features include:

1. ability to apply realistic EPR settings in all flight phases
2. realistic takeoff power and climb performance
3. lose less airspeed on idle-thrust descent
4. thust required to taxi reduced to about 39% n1
5. realistic fuel burn rate

___________________________________________________
current version 1.1 (July 31)
http://www.mediafire.com/?432i9k8s6zg4489

Thanks Dietmar. The flight model by CS really is excellent, I only edited a few parameters.

Hi,

Just curious as to what changes were made to the .air file?

Thanks

Just a question. I've made some changes to the aircraft cfg before.
Wonder what induced_drag_scalar  should be.

I now have         induced_drag_scalar    = 0.785

Best regards
Mikael

Thank you Bud!

I could not find wich value it should be for your FDE mod.

But now I know thank you for your fast reply!

regards
Mikael

Hmmm, good question. I only have the 200. I don't know if CS gave the 200 ADV it's own flight model or if it's only a visual expansion.

Thanks for your efforts.  Please correct me if I'm wrong, but when using the mod, the gauge from fsxpaul has to be adjusted, right? Since both of you are reading this thread, I hope the question is ok.

Thanks, Paul. Now that's what I call a fast service. 

Chris, just to clarity, the FDE (Flight Dynamics Envelope) includes the aircraft.cfg and the .air file.

If the ADV installation includes it's own .air file, rather than aliasing the csx732.air file from the main CS_B737-200 folder, then the ADV aircraft.cfg probably says something other than

[fltsim.1]
title= . . .
sim=csx732
model=
panel=
sound=
texture=
. . .
. . .

If that's the case then it's only applying the modified aircraft.cfg values for drag and thrust without applying the modified csx732.air values, which will result in being very underpowered.

I don't have the ADV expansion, just the original 200, so I can't do any editing with the ADV.
How does the ADV perform without any mod?

Chris the Swiss wrote on Jul 1^st, 2012 at 10:20am:


If there is an .air file specific to the ADV then more than likely it contains different values for control surfaces, flight dynamics and possibly thrust. There's a possibility the results might not be very good combining the original 200 .air with the ADV .cfg.

Thanks for update 1.4

Is "ThrustSpecificFuelConsumption" commented out on purpose in the readme or it's a typo?

Paul,
Yes the V-One gauge needs the Opt EPR offset changed.

Did a test flight and came up with -0.123 which will get the EPR real close.

1. Edit the oppropriate v-one.xml file (right mouse click on filename, then choose 'Edit'. Do not choose 'Open').
2. In section 'Initial Vars' towards the bottom of the file, change the following:
     FROM: 0.0 (>L:OptEprOffset,number )
     TO: -0.123 (>L:OptEprOffset,number )
3. Save your changes
_________________________________

I edit V-one.xml file, but I cannot find "Initial Vars" section.
I am sure it is there, I need help

Thanks
Sanal

[quote author=CoolP link=1339198966/15#23 date=1342988596]Here's what the whole chapter looks like [i]before[/i] the changes.
[code]      <Element><Select><Value>
     (L:Init_Vals,bool) 0 ==
           if{
                 (A:FUEL TOTAL QUANTITY WEIGHT, pound) (&gt;L:Fuel_Total_Initial, pound)
                 1 (&gt;L:Init_Vals,bool)
                 3.0 (&gt;L:CgOffset,number)
                 0.0 (&gt;L:OptEprOffset,number )
                 0 (&gt;L:OptAltOffset,number)
           }

           (A:FUEL TOTAL QUANTITY WEIGHT, pound) (&gt;L:Fuel_Total_Current, pound)
           (L:Fuel_Total_Initial, pound) (L:Fuel_Total_Current, pound) - (&gt;L:Fuel_Total_Consume, pound)

           </Value></Select></Element>
     </Element>[/code]
Perhaps it's best to pick a unique expression like [color=#0000ff][i]OptEprOffset,number[/i][/color] then open the file in notepad and use Ctrl-F to find it within the code. This should lead you the way.  :)
[/quote]

Not sure why your inquiry is in this thread but...yes CoolP is correct.
Which aircraft are you trying to change? -200 or -200ADV?
It is imperative that you know which you're trying to change.
Below is the 'Element Name' I was referring to:

[i][b]      <Element Name="Initial Vars">
     <Element><Select><Value>
     (L:Init_Vals,bool) 0 ==
           if{
                 (A:FUEL TOTAL QUANTITY WEIGHT, pound) (&gt;L:Fuel_Total_Initial, pound)
                 1 (&gt;L:Init_Vals,bool)
                 3.0 (&gt;L:CgOffset,number)
                 0.0 (&gt;L:OptEprOffset,number )
                 0 (&gt;L:OptAltOffset,number)
           }

           (A:FUEL TOTAL QUANTITY WEIGHT, pound) (&gt;L:Fuel_Total_Current, pound)
           (L:Fuel_Total_Initial, pound) (L:Fuel_Total_Current, pound) - (&gt;L:Fuel_Total_Consume, pound)

           </Value></Select></Element>
     </Element>[/b][/i]

You should always exercise caution when making changes of this kind...always make a back-up copy.

Did more test flights and the only thing I found unsatisfactory was a bit too much gear drag. Lowered this by 8% to get proper thrust / pitch on approach.

Changes to .air file only. Aircraft.cfg values remain the same as previous update.

File link and notes updated in post 1

johnwillimas wrote on Aug 1^st, 2012 at 6:30am:


Fixed 

Does anyone know if this mod is good to use with the 200C/F

Ive already had to adjust the max gross weight on the 200C/F as its to light at 11600lbs, ive changed it to 124500lbs to reflect its MTOW

sadly the C and F versions each have their own air files.

I might give it a go to see how it works.

bud7h7

Thanks a lot for doing this work on the 737. It is the effort of guys like yourself and the sim community that make flight simming such a rewarding pastime and the amount of work you would have done is appreciated.

I think this is a nice fix and makes the model behave sensibly like a real 737. When I first got the 737 a few days back I must admit I was quite dissapointed with its flight behaviour, which I thought was quite flaky, way too fast on acceleration, climb and descent with engine readout values that did not quite correspond with what I expected of an aircraft like this of this vintage. The 737 was always a pocket rocket but the CS intial release behaved like a pair of CFM 56's had been attached to the wings.

Off topic I know but the elevator is still way too sensitive and the cockpit wheel rolls about (backwards and forwards) incessantly in flight. In the real aeroplane and others like it these are quite firm and move slowly and do not have huge pitch change oscillations when they are moved.

I have not yet got the FD to work it just sits there toppled and the HSI is too slow and the HDG bug almost unreadable. I also get weird stuff happening with radio selection knobs. All in all the more FSX gets loaded up the worse it gets.

NOt sure if the pitch change issues can be fixed via the cfg or air files due to the interrelationship with cockpit guages and controls, I know some of this fixed up via the model files which I cannot access or change. Over to CS to do some more fine tuning.

Again thanks.

Bud7h7 The modified AIR file fix works a treat in my view and gives me the sort of performance I would expect of the this era aeroplane and seems pretty close to the real thing, although I have never flown one for real I have flown similar vintage and sized aircraft. The take-off is more measured and climb and descent pretty well as per the book. No changes to the flight stability profile with the changes to parasite and induced drag that I could discern so it is all good so far, much better than v 1.0x cft and air files, but still all goes to make it a much better product and sim experience/

Again, Good stuff and well done.

As the for elevator sensitivity it seems it may be related to FSX v FSUIPC  and my Logitech joystick, as I like the mouse wheel control setting for trim control and it seems the FSUIPC setting may be too sensitive, that being said, I need to do a lot of reading and fiddling to get this set up to get the best out of it and that it seems may be a whole new topic and era of study.

Quote:


I haven't seen this behavior. When you say loss of power do you mean thrust? Like reduced n1 reading?
EPR should be monitored every couple minutes during climb, and increased with altitude as required. If I takeoff with EPR 2.09 , by the time I am at FL240 I might have EPR set to 2.12 (if I'm still climbing).

Quote:


What weather enging do you use? The roll back you're experiencing sounds to me like weather updates (winds). Headwinds/tailwind changes will obviously result in different speeds at the same power setting. Using real weather (REX) I often need to adjust thrust when the weather updates to maintain the best speed/fuel flow or even to avoid overspeed.

Quote:


The idle thrust is the same as the original FDE (should read about 33% n1 I think?)

liser wrote on Dec 20^th, 2012 at 11:06am:


Ah yes, I failed to update that part of the notes but the actual cfg values in the text are all the latest version (1.1)
File corrected 12/20/12