Siemens-Halske Sh.I or Sh.II?
What is the correct designation of a Siemens-Halske bi-rotary engine used on Siemens Schuckert Werke D.I?
Both Sh.I and Sh.II designation can be found within various (secondary) sources for an engine rated at 110 P.S. (or 115 P.S.) at 900 rpm. Sh.I designation is more frequently used but it does not conform to regulations!?
Any thought?
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