OF (I wish I knew your name, my mom told me never to call someone an Old Fart!)

Elaborate more on the article.

I'm still looking for a good applicable force diagram of the tail dragger layout online with no luck. Have you had a chance to google it too? I understand your question/concept regarding symetrically angled wheels having equal force regardless of toe-in or toe-out. I was hoping to find a good force diagram that showed the initial position of an aircraft during takeoff roll, then a plane altered from this position (from another force, such as from a side gust, torque, etc) and how the wheels produce different values of drag, depending whether they have toe-in or toe-out. This second position along with the new forces and the airplane's inertia should explain why toe-out is unstable and toe-in is stable. I'll keep searching. My aeronautical engineering studies ceased in 1988 when I graduated. I never needed to explain this stuff to anyone - I flew single seat aircraft.

Kurt