Dwight,

check post #25 in the thread. All dimensions are given for the anhedral angles.

The school of thought for anhedral stabs is that they provide better tracking of the aircraft (among other things) through maneuvers (e.g., an F-4 Phantom). However, the drastic anhedral of 4.25" on the original Tipo was designed with the intention of lowering the effective stab location in the case of a plane with a very large vertical cross section (pipe under wing). This was important during point maneuvers when the plane was under heavy yaw control (e.g., knife edge flight and point rolls) and presumably helped to reduce yaw-roll coupling. Removal of the pipe from under the wing decreases the vertical cross section of the model reducing the need for lowering the effective location of the stab. Hence, 2" anhedral called for in this case.

If you want to alter your engine/exhaust arrangement then feel free to also play around with the anhedral angle. I think I suggested a couple of methods to be able to do this using a split stab (same post I think). You could use a system whereby your stabs are shimmed at the root to provide the required angle. With two or three different shims you can change the angle simply by swapping the shims. Your stab would of course have to be removable. Alternatively you could also use a compromise angle - somewhere between the two dimensions. Just an idea.

Cheers, David.