Hello Larry --Larry Cottrill wrote: My own feeling is that it is impossible to "unfold" or "unpack" classic FWE type engines (or Chinese, or Thermojet,
or concentric engines, or ...) in a way that makes a linear model that is truly equivalent.
We are in agreement on this, although I am confining my comments to UFlow1D.
Someone may yet write software that can describe this class of pulse reactor. ;-)