I've updated: http://www.mtaonline.net/~hheffner/HullMotor.pdf
to include the contents of my recent vortex posts, in the hope that, unlike the last 6 years, maybe in the next 6 years someone will read it and think, "Hey, the torque is indeed due to magnetic hysteresis."
Best regards, Horace Heffner http://www.mtaonline.net/~hheffner/
