And the mystery plane with the mystery engine may or may not have called for thrust?? MOst planes I build for myself never get thrust added until I test fly the plane to see if it needs it or not. If the plans call for it then I put it in. Right now on my bench I have a 4* 60 going together.[kit] It calls for no right thrust and 2 degrees down plus 1/2+wing incidence. Some kits and ARFs the thrust is already set by the fire wall.