My name is Craig Hourie, first generation Canadian, and family was also from the Orkney islands. Our family is from the Dublin Ireland area where my ancestors settled after leaving the Orkneys. I am not sure if it would be the same captain, but I have an ancestor who was captain James Hourie. He was walking down a warf one night and got attacked by two men with brass nuckles. He shot one with a revolver and chased them both away. My uncle William Hourie of Dublin Ireland still has the brass nuckles that James found on the warf that night.
All the best!