I have the same experiences. When I read about this topic before it made a reference to the "Bouncing Betty's".It's been awhile but I think the talk centered on contact points. I think that lead to a thread and links on how to adjust contacts point by assigning nav lights to the landing gear contact points so you could see where the contact point was on the runway. A genius application I thought.By doing so some airplanes where quit off when you saw the nav lights and the location of the actual landing gear's contact points.

I also believe this to be an a/c specific problem. Namely, an a/c model problem. I have never seen this behavior with a default aircraft.But with aftermarket a/c I see it a lot.my 2 cents on the subjectRhett

I'm glad this thread got bumped up. I haven't laughed so hard in quite a while.the imagery of airplanes 'dancing, smoking and hopping down the taxiway' and 'getting jiggy with it'... its all too much. thank you very much for the laughs.As I read this I remembered that I used to see 'bouncing aircraft' in2002. I never had any add on airports. I only had some downloaded a/cand some panels. ( also sound, water and trees and buildings but thats neither here nor there)I think (think ...FWIW) the problem would more likely be with airplanesthen with scenery.

>I have found a possible solution for this problem.>>Using AFCAD2 I did the following:>Go to the country where the airport is.>Open the relevant City.>A list of airports in that city will show up on the right side>of the AFCAD screen. The "Type" column contains the>word "MOD" or "STOCK".>Open the stock version of your problem airport. Right click in>an empty area of the grid. From the resulting popup, select>properties. At the bottom of the resulting display, you will>see the file location and name which contains that airport.>Example "C:Program FilesMicrosoft GamesFlight Simulator>9SceneryEURWsceneryAPnnnnnn.BGL", where "n" is a number.>This is the file you will need to remove.>>Warning, there may be other airports in this file. If there>are other "STOCK" airports, do the following:>Open each one in AFCAD and then do file, save as and save it>in the same directory that the original ".bgl" file was in.>Repeat this for all stock airports in the ".bgl" except your>problem one.>>You can now get rid of the original ".bgl" ,(APnnnnnn.bgl),>identified above. I suggest you just rename it by changing the>".bgl" file extension to ".agl"Maybe, but you just killed all your airport objects, taxisigns, and approaches. Note also that AFCAD doesn't automatically copy out everything such as ILS. It only copies it if you change it. Not sure that's a good trade off.scott s..

Good tip -- thanks. I know from experience it is easy to screw things up playing with the contact points. Here is an example of the default Baron in ACM:http://forums.avsim.net/user_files/142291.jpgNote that the static pitch puts the main gear slightly low, and the wheel contact points don't match the visual model. Now that you say after scenery loading the A/C is repositoned, some behaviour makes sense.scott s..

Scott,You are right about the taxiway signs etc in my solution. However, because I am running an addon for the airfield in question, all seems okay. I suspect it's because the addon has it's own bgl for the airfield.It is interesting that my "fix" did cure the taxiway bumps which were crashing my plane.It looks to me that the root of the problem is scenery based. I also agree with you that the model gear config helps. Whilst it does not remove the bumps, it improves the ability of the model to cope with them.I have posted questions at Posky and UK2000 Scenery to see if they have any clues.Simon

Hi tdragger,I've also noticed it, although it happens rarely and it only seems to happen when I press Ctrl+W to open up a small window with an AI aircraft view. I may be guessing but it may be due to the scenery mesh being built on the "fly", or after the aircraft has established itself on the ground.It's happened when I've had no scenery add on installed. Like I said, it's quite rare so I'm not terribly surprised it didn't come up in beta testing.James

That actually makes a lot of sense, and I suspected that it may be a ground level LOD loading issue.I have to admit, I've never experienced it with default aircraft...James

>I've had this happen several times, gets quite irritating at>the end of a long VA flight. I will be taxiing along and then>the plane starts bouncing, smoking, and skipping along, ending>in a (sometimes spectacular) crash. I'm being good and taxiing>at a reasonable speed (<20kts), It seems to happen around>taxiway intersections, though sometimes on straight stretches.>I've also created scenarios and when I start, the plane is>sitting there, parking brake on and engines off, dancing>happily on the ramp, wings flexing and smoke flying. Most>peculiar...>I have no "add-on's" to speak of, improved taxiway textures is>about it. My settings are generally low to medium, as my>humble Athlon 900 can hardly handle more.>Any guesses? Thanks in advance...>>Dave>KCOSMy humble guess is it's due to "computational flutter". When the CPU has not enough computational power left (probably because it's taxed by other tasks as scenery, etc.) to calculate the Flight Model with enough frequency, the latter becomes instable.Try lowering all graphic sliders (and other demanding options as AI, etc.): if the plane don't bounce anymore, then you've found the cause. Then you can raise your graphic settings a little by little until you find a good compromise.Marco

Hi fellow runway bouncers! Ok I have now found that I have not lost my mind, and there are others suffering from my same problem.... Been laughed out of several other well known forums, so I know there are skeptics & non-believers. I would like to think of this as "MS ACOF X-Files" - "The Truth is Out There".java script:smilie_remote(':-spacecraft') I have spent the last 3 weeks trying to find an answer to this annoying problem, and/or others with this problem. For me the offending airport is McChord AFB - KTCM (Default). I first thought like some it was an aircraft contact point problem, because I first noticed while landing, Mike Stone's C-141 and ended up a little long in the runway, and just past the second taxiway intersection the dance started. So I took another plane into it and it did the runway jitterbug. Then tried about 8 or 9 different planes, default A/C included, and still they were dancing. So then I thought FPS / LOD / Display issue. Well I have a 3.2ghz PIV with 1 gig RAM, & 512mb PCI Express Radeon Card,(Most add-on scenery never a problem, I fly mostly out of PDX with a big scenery add-on and tons of Alaska & Horizon AI's coming an going.) and set no AI's, turned the sliders down low, still dancing. Downloaded & tried 2 very good freeware add-on scenery pkgs, nope still dancing. Got Flatten EX flattened the whole airport Poly, nope still dancing. Manually entered into the scenery cfg. flatten & excludes lines, nope still dancing. After about 100+ hours of trial & error, and trying numerous theories out. I did take AFCAD, moved the runway so the north end, is just at the point where to dancing started, and now the take-off & landings with any aircraft is smooth as silk. So I firmly support the MS Communist Plot theory, and the existance of MSFS "Black Holes". I need to know from others here, are there any of the so-called MS FS9 update bridges next to your dance floor runways?? There is 2 nearby, KTCM, also I did fly into KTCM before the update and do not remember the dancing, just checking out another theory. Next after a little practice with Sbuilder, I hoping to give it a try.....

Hello Gang!I can concur with the problem. Sitting on KSEA, runway 34 with either the Meljet 777 or the PSS 777, or even the PMDG 737, all airplanes bounce as they sit in the take off posistion at the end of the runway. I have turned the realism setting down to cope with the issue, but this happens from time to time on my system with no scenery addons installed.My 2 cents.Sincerely,Dennis D. Mullert