hi, Just trying and getting to understand your point, been long since i've been on steam propulsion units. But this seems likely. (My opinions, don't mind if i'm off a bit)
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What are the reasons the Brits used two shaft geared turbines paired with two boilers for their "C"/Battle/Daring class destroyers but the USN used two geared turbines paired with four boilers for the Fletcher/Sumner/Gearing classes?
Does it have to do with shaft horsepower?
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It would depend on the PSI of the boilers in use. The capacity of the geared turbines to generate power dependent on boiler production. Also it might be dependent on the length of the shafting that could result in power losses. Too many variables here. But it could keep a design person busy configuring the right combo of steam production, usage and utilization ultimately post geared conversion for adequate power/ thrust requirement.
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Would the Knox class frigates been able to have easilly/economically/space wise incorporated another shaft and geared turbine and with the same or different boilers realised increased speed to 29/30 kts or better?
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I think there's a misconception here. I've been away from steam driven ships awhile, yet i know one can get better speeds theoretically on single screw, single turbine and single boiler with right specs that twin screw ones with inadequate ones. Speed will ultimately depend on delivered HP right at the screw end minus shaft losses and yes also the production capability of oil, (coal), whatever fired boilers, or maybe steam generated through fission. Idea is to get a certain PSI, that drives the main propulsion unit/s. Get certain required BHP which translates to a certain speed at nominal slip, ultimately through the propellers.
Having 2 boilers or more is immaterial to horse power requirements. It matters as stated before on maintenance, possibly extra power requirements if turbine capbailities are adequate. Nothing more. Rest are design issues. These include space, reliability, functionality host of other issues.
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How would it effect endurance?
I really like these ships except for a couple issues but mostly for being saddled with one screw and one geared turbine.
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Sir, maneouverability is an issue here. IMO twin screws are better in some ways than single with equivalent power o/ps. But i don't see why with bow/ stern thrusters and like, one can't get better maneoverability. Easily controllable, less dependent on boiler turbine functions.