Significance of "propelling machinery"
It dawned on me that we needed a definition of "propelling machinery."
My search led to this:
6-98 A sailing under part sail but also using propulsive machinery (‘motorsailing”) so as to give her additional speed is not a “sailing vessel”.
From Marsden on Collisions at Sea, p. 194 TinyURL.com - shorten that long URL into a tiny URL
I think that the part in bold is crucial. Charging batteries and running compressors does not give additional speed.
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As I sail, I praise God, and care not. (Luke Foxe)