Porpoising aircraft at certain airports

[Nic 0]

Hi guys At some payware airports I find that my aircraft (PMDG 737,LevelD 767 ) start to what I can only describe as fluctuate up and down during taxi and take off, I have never noticed this before. It occurs at Imaginesims KATL and FlyTampas new KBOS more noticeably than any other airport. I have checked for double AFCADS my Scenery Vertex level is set at 21. The only thing other than the new KBOS I have added recently has been new makerunways for Radar Contact 4. It makes me rather seasick does anyone have a solution to my problem? Regards Nic Jackson

[John Hinson 22]

At some payware airports I find that my aircraft (PMDG 737,LevelD 767 ) start to what I can only describe as fluctuate up and down during taxi and take off, I have never noticed this before. It occurs at Imaginesims KATL and FlyTampas new KBOS more noticeably than any other airport. I have checked for double AFCADS my Scenery Vertex level is set at 21. The only thing other than the new KBOS I have added recently has been new makerunways for Radar Contact 4. It makes me rather seasick does anyone have a solution to my problem?

It is possible that the runways are designed with rough surfaces in the AFD file, even if not visible as such as the add-on scenery may use its own runway textures. Take a look at the AF2 file and see what the runways are specified as, and maybe change them to asphalt or concrete. Surfaces like tarmacadam and gravel will give you that bouncy effect.John

[Nic 0]

Hey JohnThanks for the info. The problem was indeed the underlying ground structure made a taxiway concrete and tested and all became smooth again, will update the other taxiways later. Regards Nic Jackson