RE: 85 ft Harbor Tug/Angels Gate
Keith thanks for the link I will look into them for a project I have in mind. I made a set of aluminum nozzles for a Shelly foss Tug kit I have. As I understand it you need special props with a flat edge for highest efficiency to use with the kort nozzle. I have a Maggie M fishing vessel kit that I had to order a special prop from the prop shop to use with its kort nozzle. The flat edged prop has a minimal clearance around the diameter for better speeds. The fixed kort nozzle set Harbor sells looks like that is what they use. But it is hard to tell from the photo.
Tug