Can everyone calm down. There IS a problem with the acceleration pack, it is nothing to do with how the aircraft is loaded or phugoid oscilation. There IS a fix.Install FSX, install SP1, install acceleration.Copy the whole of the "..\Microsoft Flight Simulator X" to another drive.Un-install acceleration - I know it looks like it un-installs everything but it just drops back to standard FSX installation with SP1.Install SP2.Copy the following subdirectories from your copied installation back to the 'live' installation;CategoriesEffectsGaugesmissionspropdefsrewardsscenery ** Setup - there are changes here but I need to investigate further, hold off on this one **Sound Uires ** I don't know what this is but it does no harmIn simobjects\Airplanes just copy; FA-18 P51_RacerCopy the whole of boats (it's just easier), same for GroundVehicles and Misc.For RotorCraft just copy EH101.You now have the new aircraft and missions. I've tried a couple of the missions and everything looks like it's ok. More importantly, I can now take off from Heathrow, climb to cruising altitude, set the AP, hit x16, go watch TV and come back in an hour ready for the descent into Singapore.Oh, and by the way, where have I been? Had FS9?I've been flight simming since v1.0 by Bruce Artwick back in the seventies on a TRS80.