Reply To: Kylchap Exhaust Systems
I don’t know if your familiar with Jos Koopmans’ book “The Fire burns much better…” which is included in the Books for Sale section of this website. It’s basically the thesis of his Ph.D. where he made a detailed study of the history of the design of locomotive exhausts. It’s a bit heavy-going for the average enthusiast, but with your knowledge, I’m sure you would find it interesting. The reason I mentioned it is because Jos was quite critical of the Bulleid-Lemaitre exhaust. Jos identified some key proportions which he had distilled from test results of locomotives with successful draughting, and I’m thinking that if you combine this with your approach using the efficiency curve, it should be the basis for a good design.