Here's a good reference to calculate TVC:

Ls should be described as quarter chord of the wing to the quarter chord of the stab

Use in conjunction with my earlier post:

https://forums.rocketshoppe.com/att...achmentid=57624

The average chord and the Mean Aerodynamic Chord are basically the same thing.

In the diagram the AC points are the QC of the wing and the Quarter chord of the Stab

Attached Thumbnails

 

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