I thought I'd post this out of curiosity, after seeing a thread that's been moved to the PMDG forum.All the add-ons I have are original and bought direct from the manufacturer (programmer...?) with the exception of JustFlight's UK VFR Photoscenery (Amazon marketplace) and loads of amazing stuff I've downloaded from Avsim (thank you lots). I don't have anything by PMDG and, except for the JF stuff nothing that may be illicit.But... I have bouncing aircraft. It's most likely to occur when I switch from 2D panel view to a 3D view like spot or VC. It's most noticeable (not most extreme) with the new PAD Dash 8, but simply because that has a squeaking, smoking tyre effect. It happens with all my aircraft, right down to MS original C172. I thought it might be caused by the VFR photo stuff and something obscure like a mismatch between the drawn elevation of the terrain & the calculated elevation of the tyres but as I recall (I'm not at home) it happens at default airports in other countries too...I've never worried about it as 1. the aircraft don't seem to suffer (no blow-outs yet) and 2. I fly from an armchair (not very realistic). I always put it down to either a quirk of MSFS or just an oddity of my cobbled-together system.Still, if anyone else has noticed it and found out why it happens, perhaps you could satisfy my curiosity.In the meantime, thanks all for the superb additions you've placed here, and thanks Avsim for, well, everything you do.Regards,Dave

yes this is a known issue that can happen in FS (through multiple version of the game included 'X').it has to do, in part, with the 3D world being drawn and the ground elevations being changed; and the speed (CPU) of the computer being used.--

Hello,I know about meshes or some afcad problems but it's the first time I read about this one:

and the speed (CPU) of the computer being used

Can you elaborate ?Regards.Gus.

first time I read about this one:

...the speed (CPU) of the computer being used.

Can you elaborate ?

gus:the slower the computer the more time it takes to set/draw the FS ground. the longer it takes the greater the 'bounce'.--

Hello,

the slower the computer the more time it takes to set/draw the FS ground

I wonder who will use FS2004 at today with such a slow CPU ... for have this nasty effect .....Mini requirement is 450 Mhz :)And I beginned play FS2004 with a Pentium 1.5 Ghz and never suffer such bouncing :)Actually I use a P4 3Ghz.Regards.Gus.

I wonder who will use FS2004 at today with such a slow CPU ... for have this nasty effect

my old computer had moments ... but most times did not.my current computer has VERY VERY VERY VERY rare moments ... but will happen at times if i change from 2D to external and catch FS at the same time it is updating weather or other process kicks in at the exact same moment.--

Hello,Dunno .. but are you not confusing stutters with bouncing ?The OP problem is plane bouncing on the ground.Regards.Gus.

Dunno .. but are you not confusing stutters with bouncing ?

a stutter can cause a bounce ... but a bounce does not require a stutter.yes, i know the difference ... i've only been doing this FS things for 20+ years.--

Gentlemen,Why don't we ask the OP what exactly his specs are? Might eliminate speculation. Might not answer 'why the bounce', but would get the ball rolling in the right direction. These type of questions, with no data that one can use, are interesting (for conversation) but very difficult to 'troubleshoot'.Chuck BNapamule

Dwww...I'm not much of a technical type. The processor's running at 2.5 gig and the gpu at, off the top of my head, 750 meg, but the motherboard's bus speed is only something weenie like 130 meg. The PC's made from hand-me-downs and cast-offs (not even a PCI-E slot on the motherboard, only PCI or AGP).This should give an idea of how it struggles. At 1024

Hello,The big variation of FPS can be originated by many things :The complexity of the weather or the scenery (airports)Or by a proggy running in background.The proggys who have the most negative influence on FPS are usually those who for some reasons are scanning the files on HD like the antivirus realtime scanner or indexing processus .. etc ..Be sure to have those programs or processes shut down (disabled)For your bouncing airplanes it can be the result of a AFCAD or some meshes ...Are you using a addon meshes ..What is your VERTEX setting in the FS9.CFG ?Maybe with those suplementary infos .. someone can help Regards.Gus.

But... I have bouncing aircraft. It's most likely to occur when I switch from 2D panel view to a 3D view like spot or VC. It's most noticeable (not most extreme) with the new PAD Dash 8, but simply because that has a squeaking, smoking tyre effect. It happens with all my aircraft, right down to MS original C172. I thought it might be caused by the VFR photo stuff and something obscure like a mismatch between the drawn elevation of the terrain & the calculated elevation of the tyres but as I recall (I'm not at home) it happens at default airports in other countries too...

Dave,This is not particularly unusual when switching views, it is generally caused by imperfect contact points in the aircraft.cfg and is thus more prevalent on add-on aircraft. It will this be more/less obvious according to the aircraft you are viewing. I have never noticed it in default aircraft, though - but then again I don't fly them.You can soon see if this it the problem by saving a view in Pause mode, loading that "flight", changing to the aircraft of choice and un-pausing - and see if it jumps.I don't think the scenery would affect this.John

Hello,I fly on regular basis the default C172 and the C182 and never seen the bouncing phenomena for those planes So I think we can discard a aircraft contact points problem (at least for the default Cessnas)Regards.Gus.

I fly on regular basis the default C172 and the C182 and never seen the bouncing phenomena for those planes So I think we can discard a aircraft contact points problem (at least for the default Cessnas)

I too would be surprised if the default Cessnas give this effect but the correspondent did say it varied between aircraft which makes me reluctant to blame it on scenery. But maybe it is a combination.Dave - to help us analyse this one, could you run some test by loading a default Cessna, your Dash 8 and perhaps a couple of others at an unmodified airport of your choice and compare behaviour? Let us know what you see.John

Dave,I commend you on making your own PC with 'spare parts'. My first PC ('IBM Compatible') was put together from garage sale and 2nd hand pc parts store parts. I did not know the specs on those either. It either worked, or it didn't work. Sounds like you have a Pentium 4 (2.6 Ghz). You can do a lot with that CPU by adding 'modern' parts.I believe you might profit by BUYING (oops, sorry) a 7200 RPM Hard Drive. They are cheap now a days. I suspect you might have 'inherited' a 5400 RPM hard drive and those are ok for word processing, but not for Flt Sim. You also should have at least 1 Gig of RAM. Would help with 'bottleneck'. Have fun.Chuck BNapamule