There are some problems that do not get discussed in most textbooks of aerodynamics because the space required to describe the solution is judged by the authors and editors to be excessive for the value received. In many cases, this is because the solutions require numerical techniques such as root finding, numerical integration or solution of linear systems. However, these questions do arise and the practising aeronautical engineer occasionally needs the solution. Since the standard textbooks are of little help, a lot of time can be expended in the search for an answer, even though the problem has been solved over and over again by others. Maybe this page will help.