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AI Taxi Speed

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I might have found something... I have, what I think, might be the call for the speed of the AI planes in taxi. I found the reference to it, mentioning it as KPH. Will keep it up to date, now I need to change and test. Will keep it up to date here.Dave

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Ok, here is what I have, so far. The file mentioned before, AI_PLAYR.dll has NOTHING to do with the taxi speed. Upon opening the program, flying a complete pattern with ATC at various settings, FS2002 NEVER called for the file AI_PLAYR.dll. So I guess we could put that to bed, so, now the question is still there, which file is it. Now, for some unknown reason, when the sim loads, it is continually callng for the 737-400.gau file and the gps.gau. This happens BEFORE the sim is even fully loaded, while the splash screen is still there. As promised, I am trying to keep people up to date, so any help you could offer, even failures, would help, as I would then not repeat them.Dave

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Bump, keep up the work!!, I really hope you find it as the go arounds are driving me nuts!!:D

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Still nothing...tried everything I could think of, 2-3 times, and nothing...debugged, decompilied, and hexed, to the enth degree....NOTHING!!!! If anyone wants to try and help, I am taking offers...Dave

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I was just think, but if you increase the idle power (a don't knowif is this) in Aircraft.cfg for a AI they don't move fast?Sorry if it's dumb, but is just a guess. Trying to help!

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While it looks like the AI pilot is actually flying the plane when it's in the air (and hence the problems landing planes "not familier to him") I think another approach is used on the ground.I think the planes simply follows a track with a predefined speed. They do not really control the nose wheel, breaks, or throttle.

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Tried that, but no luck..Johan[A HREF=http://www.phoenix-simulation.co.uk]Phoenix Simulation Software[/A]Unofficial PSS website:www.people.zeelandnet.nl/johd

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I too have been trying to alter the taxi speed, but am starting to believe it may be hard coded somewhere in the ATC routine. I do know that it is going to play havoc with all these 'real life AI traffic' downloads. The ATC will let things get backed up just so far and then you start to see planes getting vaporized.

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Help me understand....if I am not mistaken there is one aircraft (a prop job?) that has much difficulty in maintaining a SLOW taxi speed? anyone remember which one?the reason I ask.... if one is way to fast and the rest are to slow one would deduce that it isn't one location that controls everything?having decided this is probably the case I've looked deeply into what MSFS2K2 does upon loading and see that for every AI aircraft loaded it reads the cfg file and air file (if 100 MD 83 AI aircraft are present it read the cfg file 100 times and the air file not nearly as often and as of yet I have yet to decide what that pattern is). Here is the strange part... in the air file it only reads 200 bytes. Now to decide where in the 200 bytes it specifies what speed the aircraft can go, what taxi speed it should maintain and what its maximum (+ or -) VS should be.so, can anyone remember which aircraft taxis way tooooo fast?-j

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When you fly it the King Air taxies very fast, even at idle. However, as an AI aircraft it taxies as slowly as the rest. Thus, it can't be in the cfg or AIR file - it must be something hard coded in FS.Hope this helps,-- Tom GibsonCalifornia Classic Propliners: http://members.aol.com/tgfltsim/index.htmlAlcoHauler Locomotive Page: http://members.aol.com/alcohauler/home/alcohaul.htmlFreeflight Design Shop: http://www.freeflightdesign.com/ San Diego Model RR Museum: http://www.sdmodelrailroadm.com/Drop by! ___x_x_(")_x_x___

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John:I have done some work also on taxi speeds and found the same thing with the cfg and air files. What got my attention was the same thing you saw with one of the AI aircraft. Its a GA aircraft and when I was watching the taxi spd at my local GA airport the airplane was alot faster on the ground. I didn't think much about it at that moment because I was adding and testing gates with Add-a-Gate. When I saw the post the other day on taxi speeds I went back and re-checked some of my work and I have found that the Cessna 182R RG could get to the hold point faster than any other airplane. I tested this on two different taxiways running side by side (each side of the runway simular to a drag race) so the 2 planes would not interfere with each other. Hope this helps

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It is hardcoded unfortunately. I think the hardcoded value is 15 knots, although AI aircraft never seem to taxi that fast. If you're a hacker, then disassemble AI_PLAYR.DLL and look for 402e000000000000, which is the IEEE 64-bit floating point equivalent of 15.0.

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I dunno. It kind of looks like code to handle the old dynamic scenery. I'm pretty sure those various traffic types match the ones decoded by Maurizio and others way back in the day of FS5STRUCT.TXT. The word "dynamic" is particularly telling. For those reasons, I doubt that code relates to the AI aircraft in FS2002.

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I have seen the statement a number of times here and in other threads that the AI Aircraft all seem to taxi at the same speed.I beg to disagree. I have seen MANY instances of one aircraft overtaking another and having to slow down to match that speed and get in line.But I also have not seen a pattern as to what aircraft sizes tend to be faster or slower. I think I have seen nearly all types be slower or faster.I know that all aircraft slow down near turns but that is not what I am talking about. Most of my observations have been at KATL where there are some pretty long straight taxiways and I have noticed the speed differences often.To me, that says it is not "hard coded" into it unless the hard coding is in the form of some type of table relating to the type of aircraft. But even that seems to defy categorizing.

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Bill,just a quick question: Using AI map, I have never seen any aircraft taxi faster than 11knots (ground speed) ... you've seen differently?can you tell me how I might duplicate?-j

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While I was pushing back a SouthWest 737 I saw another Boing 737 on the Taxiway going at the same speed as my aircraft while pushing back.So, I wonder if the AI aircraft is accessing the same subroutine for it's taxi and push back speeds.HectorB.

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Hmmmm. Interesting challenge, John.How do I let you see what I am seeing?Guess the only way is to tell you that where I've seen it is when in slew mode, top down view, frozen at 1500' above KATL where I can watch most of the runways simultaneously. Then sit for a while and watch.I have the WorldAI10a installed along with all of Delta Flight Schedule plus all the stock flights. So I have a LOT of aircraft of all sizes going all kinds of places--almost every concourse has at least 80% of the gates filled.But I have seen Cessnas overtake 777's and vice versa on a straight runway from midfield out to both 26R and 27L for departure.Like you, I have AIMap installed as well and I know that the speeds stay around 9 knots but that does not change what I saw happen visually.Now, I won't say that there was not some factor I am not taking into consideration. I am just saying that is what I have witnessed on numerous occasions.Of course I have also seen some aircraft taxing all over the field, not following any particular path, stopping totally for periods of a few seconds to a couple of minutes in the middle of who knows where, turning at weird headings where no runways or taxiways even exist (I built the taxiways with AFCAD), and then finally getting on a correct taxiway and taxing to a correct hold short point, getting clearance, and departing as if nothing unusual had happened at all!And those did that at all kinds of speeds from 2-3 knots to above 15 knots. :)And I don't drink or take drugs stronger than a cigarette and my wife's sweet tea! :)

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do you think then that fsuipc may be reporting incorrect data to aimap?just wondering.-j

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Boy, your guess is as good as mine--probably better!I'm afraid I just don't have enough low-level knowledge to know.

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Bill:This is just to confirm what you see at KATL I see the same thing with top down sitting on the ground. I have 9 overlays for KATL and close to 200 gates using all 4 runways. Just want to make sure somebody doesn't jump in here and say can somebody else test this. I will say that all my aircraft do stay on course when taxing but I contribute this to using all stock airplanes and repaints except for a few A320's. I found to many 3rd party planes don't like to be AI Aircraft and use up alot of frame rates.

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well... having read this... and witnessing it with my own two eyes it would make me believe that it is not hard coded in any dll file then unless of course it was a ratio compared to weight and thrust (which I doubt). I'm going to stick to testing in the air file and with only 128 bytes of data loaded for AI aircraft from that file it shouldn't take long to see if in fact it is there. I've already done some preliminary testing and know for a fact how to crash FS2K2 with the air file now :D-j

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Glad to know I am not going crazy.Or at least, not any crazier than I already am ! :)You got me beat on the overlays! I only have 8--KAT1, KAT2, ...KAT8. Of course I do still have my original KATL but I don't use that for AI so I guess that doesn't count as an overlay, right??? :)As for stock vs repaints vs "other", I do have too many of the "others". Have got to get back to downloading I guess and find more low overhead versions because it is definitely hurting my frame rates.But I was also actually surprised that it did not hurt my fps as much as I thought it would. I can actually view fairly well when in normal mode and taxing around. But it is very noticeable when I go into slew mode. Takes a little longer to spin the aircraft around to view different directions.I am definitely going to work a bit more this weekend on fine tuning which aircraft I am using for each of the overlays.

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