From What I understand the Wright brother never had university training and although never getting a high school diploma they did attend high school. Looking at the diagrams of their original work they needed to work out pressure differentials on the surface of the propeller using mathematical formula. Their work appears to have quadratic equations and cross products in the calculations complete with torque and power. Does anyone know where they may have learned these skills ? I don't believe any high school of that day in that area of the country would have had the ready math and physics needed to these tasks. Or was it the case that they were self taught in all the needed math,experimental, managerial, drafting and tooling skills needed for such an accomplishment? The diagrams are more along the line of advanced undergraduate but way beyond high school or at least those of today. Thank you.