The appropriate choice of coordinate system so simplifies basic cycle analysis that computation of the ideal particle trajectory diagram reduces to a straightforward graphical process. Ideal pressure, Reynolds number Nre, friction factor Cfand heat-transfer parameters Nstand N2/3prfollow in function of location and crank angle via a few steps on the hand calculator. A thermodynamic design parameter is identified which has essentially the same numerical value for such diverse Stirling engines as Philips' MP1002CA, General Motors' GPU-3 and the turn-of-the-century Kyko hot-air engine.
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