Most of today’s work was spent revising the saddle and cylinder dimensions and alignments. Rough checks were made from scaling the Lingenfelter’s drawing.
Then, since the guts of the CK Holliday’s cylinder, steam chest, and valve gear are not known. So, to model these details accurately, I had to “re-engineer” the engine some what. Hopefully I follow the same “track” (haha!) as Walt did when building the engine in 1955.
The DLRR line normally travels at 10mph around the park. I assumed 15mph just to have some margins. With some engineering (they’re really just geometry calculations) we can figure out the speed of the sliding valve, knowing that the engine has a 10″x15″ cylinder.
Then, use the table from Meyer to get the steam port size. From the table below, at 350 fpm, the steam port size is 0.058. Plug this value in cell E10, and we get steam port area of 4.55+ sq. in.
Don’t forget to tweak the numbers a little bit to make the dimensions machinable.
And here’s a rough sketching of the steam port on the steam chest seat.
