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Question for the Air File Gurus

O

OBIO

Retired SOH Admin
I am working on the conversion of Tim "Piglet" Conrad's F-5 series to CFS2. The plane is superbly modeled, full animations. Have the Dp file from the freeware Alpha Sim F-5A in place and adjusted to fit Piglet's planes. 2D and VC panels are regauged as much as I can get them...I don't have CFS2 compliant versions of some of the gauges used in FS2004. I ran the stock FS2004 Air and Config files through Air Wrench to get them to work in CFS2...and they do beautifully....until the plane gets close to Mach 1. At around 580 to 600 knots, I begin loosing airelon response. At 700 knots....nothing from the airelons at all. Once I slow the plane down by climbing (elevators and rudder work fine at all speeds) the airelon response returns.

What should I look for in the Air and config files to correct this problem? I could use the air and config files from the Alpha Sim F-5A, but the modified stock files are HOT and make Piglet's F-5s a real joy to fly.

OBIO
 
I have the same problem with the 1% ME-262 from AVhistory over at Netwings, I think it's compression at speed. ckissling
 
OBIO,
You may want to post this thread in the SOH Designers/ Flight Dynamics Forum.
Cheers Thicko
 
If you're only using AW to make the mods, use the Dynamics tab to adjust the target roll speed to the maximum speed you want to reach before losing aileron control. You also can adjust roll rate deg/sec there as well. Select one of the center radio buttons to select the speed range in mph (or knots if you check the box the below the range list). That will extend the chart's speed range. Then play with the data fields below the chart. Make a spot change and go to any other tab, then come right back to Dynamics to see the net changes.

After you finish working in AW, you can also fine tune this area in record 546 of the airfile (Roll Rate reduction per G). You have five G settings to use. Set the desired G value and the desired rate of reduction. Don't worry, its about acceleration G's, not maneuvering G's...
 
Thicko,

I had forgotten about the Designer's Forum. Thanks for reminding me just how big this site is.

Bearcat,

Thanks for the tips. Will give them a whirl and see what happens.

erufle,

I don't think that a concise tute on the air file has ever been produced. From the time I have spent in air files, there is one thing that I have learned with perfect clarity....air files are tricky buggers that have dominoes for an ancestor....you touch one thing and that one thing can effect a number of other things...sometimes with drastic results.

OBIO
 
I don't know of one concise and comprehensive job anywhere and i've spent some years searchin' too...there may be one around that i missed somehow. If you find it, shoot me a line on it. My "tut" collection (if you can call it that) looks like a raggedy stack of single page blurbs. I never had the time or will to put it all into one work :icon_lol:.

Unfortunately, the helpful AW utility doesn't come with a manual, so you're left to trial and error. Since i had spent so much time dissecting air files before acquiring AW, i had a pretty solid background to help me navigate it. :isadizzy:

On another related note, as a student of FDE topics and workings, one advantage to owning MSFS series in addition to CFS2 is you get the benefit of learning the differences and the similarities between how the civil sims interpret and use flight dynamics data compared to CFS2. And you also learn what can and what cannot be ported from one sim's flight modeling to the other and applied to both player and AI aircraft.
 
Bearcat

Your tips did the trick. I changed the Target Roll Speed from 263.5 mph to 775 mph and the Target Roll Rate from 180 to 150 just to slow down the roll just a tad. Piglet's F-5 now handles great all the way up to 800 knots.

OBIO
 
I think I can figure out airfiles through trial and error, but I want to eliminate the amount of time I spend making errors. If someone could simply describe how each entry affects flight characteristics I could get started. For example:

stall speed = air speed at which the pilot cannot maintain lift

This might be a way I can contribute to the community given my limited time, but I need information. Being a science geek, I naturally understand the physics and graphing variables. My weakness is, I'm not a real pilot.
 
Can i interest you in a short stack of blurbs instead? :icon_lol:...you should find some interesting and useful notes within. Just change the extension to *.zip and extract.
 
Thanks a lot for posting this, Bearcat. That is a great compendium of airfile-tweaking guides.

bearcat241 said:
Can i interest you in a short stack of blurbs instead? :icon_lol:...you should find some interesting and useful notes within. Just change the extension to *.zip and extract.
Click to expand...
 
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