I have a UFO not the alien kind. I based it on a similiar aircraft and start tweaking it to fit it into the FS2004 world and it starts acting crazy. but if i leave at is at first  it flys great but like floating up above the run way So i cant have that When i start fixing things like that it goes crazy and i have tried 3 other aircraft as well. Is there anyone out there is good with a unknown aircraft and making them do what they should be doing ?