Attached are a set of 8 pages of construction drawings for the two cylinder 25HP Darracq aero engine of 1909 described at:
https://www.homemodelenginemachinist.com/threads/darracq-25hp-1-4-scale-model.35515/
The drawings of the crankcase and cylinder and some valve parts have been used to construct a model of the engine. The other drawings are accurate but perhaps not complete as they haven't been used for construction purposes.
These drawings are traced from drawings in the US patent office.
I will be happy to provide drawings in .dwg format upon request.
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