How long do you think I could feasibly operate sailing ships like the cutty sark? I mean, they're pretty speedy, but do they lack cargo space or some such? What's going to push me into engined cargo ships, and when?
Cutty Sark remained active in the tea and later the wool trade until 1895 so you could probably run clippers until then, though you're going to see a major reduction in fleet size in the early 1870ies after the Suez Canal opens. You could conceivably run them for longer (Cutty Sark remained active as a trader until 1922) but I doubt it. However, you could see a revival of your sailing flleet in the 1880-90ies if you go into the South American nitrate and coal trade. This time however you're looking at four or five masted iron and steel barques and later six or even seven masted schooners like the
Thomas W. Lawson
The thing that killed the sailing ships was the improved reliability of the steam engine, and later the introduction of the diesel engine. As the engines got more and more reliable and more and more efficient sailing ships ended up being outsailed.
The only thing they could compete on was range, since they didn't needed to refuel, and as efficiency increased the profitable routes became longer and longer. That's why the nitrate trade remained profitable all the way up to WWII.
That being said, sailing ships, usually fitted with an auxiliary diesel engine, did remain profitable on the European coaster market until the 1980ies, but that's of little interest to you.
The SS Uganda is gorgeous... is there a chance of sizing her up and using a very similar but larger design as something of an intermediary? (i mean i'll draw it, obviously)..
Probably. She's from the late 1870ies IIRC. Heuhen drew a couple of somewhat larger ships from the 1880ies if you're interested.
For the interwar period you should seriously consider something like the Selandia, since she was built specifically for the East India trade.
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