Vertical stab rake-back in early (Taurus era) planes was about 30-45 degrees, and added a significant up-elevator component to assist in spin maneuvers, since CG's were forward of later designs. Think of the rudder at 90 degrees to get the idea. In the late 70's/early 80's, a bit of rake angle (10-15 degrees) was used to compensate for the "pitch to belly" in knife edge. Much less than needed for the earlier spin stuff. This places your model square in the 1975-82 age range.


Of course, some designers just thought it looked cool.................<br type="_moz" />