hi hal, it sure does, thanks a bunch for the info...i've been building models for over thirty-five years and taken out and put in diahedral....built a couple of the .049 planes that came as full size plans in model builder, but never wrote down any numbers....mostly did a TLAR, (that looks about right), when building, but, didn't want to start my combat "bat" rudder plane with out a known starting point....and from your info it looks like i need to start between 5 and 10 degrees..the wing sits on top of the flat side of the bat and the tail surfaces are just less than an inch lower than that....and its a short coupled platform also.. thanks again, bill w.