New to blender still and for a while now I've had this same problem here and there whenever constructing objects. I'm working on the first "Blender Learning Exercise" (yellow sub.) and I got to page 98 http://gryllus.net/Blender/PDFTutorials ... marine.pdf when I happened to notice that somewhere along the line my rudder was somehow merged to my sub and are now the same recognized as the same object. Not only that but when I go to delete the object there is a plane that always remains and can neither be deleted or moved. I also noticed that my sub got renamed as the rudder during the process. Is there any way for me to be able to delete this plane and just rename the sub. Also, does anyone know what I may have pushed to cause the rudder (the plane which I added) to become part of the sub?
I've attached my sub file so you can check it out and see what's going on exactly.