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I haven't used turbines for direct propulsion in a while but it sounds like you don't have enough torque for what you are trying to do. Have you tried reducing the gear ratio (so the prop spins at closer to the same speed as the turbine)?
Also, check your steam setup is running effectively, with 4 turbines your inconsistent speed might be the result of inconsistent steam flow. (Check that the pressure on the steam intake for the turbines as at or near 60 atm consistently.)
Maybe I need more turbine?? Or more gearbox?
Try 12-16 turbines if you can fit them.
It's also recommended to pipe them in parallel and use a large electrical pump to pressurize the steam:
boiler -> 1x large electrical pump -> split into all turbine steam inputs
then do the reverse for the steam output into the condenser:
all turbine steam outputs -> 1x large electrical pump -> condenser
You actually need 12 turbines? Well, maybe for direct drive. Direct drive sucks. I always go SGED--steam generator, electric drive. I run a VTOL and a 200k-mass, full-workbench trawler that way. The VTOL burns less fuel than the starter boat at 500 knots. The trawler... I'm not actually sure. It got to the arctic with 10,000 more liters of fuel than it started with so it's glitched somehow, I'm not sure how much it will burn working properly. Oh, yeah, they just use diesel furnaces. No farting around with coal or uranium. :P
I just think direct drive is cool~XD
Keep the heat source temperature around 130° and the condenser will have an easy time converting it back to fresh water.
Steam turbines used to be in the same power range as a medium prefab diesel engine, around 155-160 generator output from a single turbine.
Now they are more powerful and able to produce ~530 generator output from a single turbine.
You used to need way more turbines previously.
Make sure to use 2x gearboxes set to 3:1 facing the turbines to get all the torque out of them and follow the piping suggestion I posted above.
You might want to run a direct comparison between direct drive and electric.
Also feel free to post that 500kts starter boat, doesn't seem to be on your workshop.
Maybe I got the problem.
I set one big propeller before, it's slow and unstable.
I change 4 small one and the speed increase from 10 to 17.
Not good enough but much better.
I think water resistance is the main reason.
Even I change to motor still useless...
I just build 4 big motors, now everything is OK
I don't recall ever using the word 'starter'. The one that can go 500 knots (depending on wind; a more consistent top speed is around 450) is not a 'boat'. It's a VTOL AIRCRAFT, and it's right here. https://steamcommunity.com/sharedfiles/filedetails/?id=3174095742
Yes it started with But Hull's V-04, but I put the steam engine in it.
The TRAWLER is a boat, but it is not a 'starter' anything, it's what I made out of the old Troll III and it's pretty much as big as a ship can be. Any bigger and it would just be a giant box. And it will never do 500 knots, it only does 50. I can't post it because the author seems to have gone inactive so I can't get permission to reupload.
Anyway, seems to be a misinterpretation on my part then.
From how I read your quote above, you stated your VTOL consumes less fuel than the starter boat at 500 knots.
When instead you meant your VTOL going 500 knots consumes less fuel than the starter boat.
Oh yeah, you're right, I DID use the word, you just skimmed over it and got the context wrong. Happens to me sometimes too. :P
Yes, I meant that even at 500 knots, my VTOL uses fuel more slowly than the starter boat. Well, I *think* it does. I haven't measured it. It sure uses it slowly though. And generates like 15000 swats on 3 turbines. It's all in the flywheels and the clutching.
Actually if I ripped out the steam engine entirely and attached a large electrical motor to the flywheels behind 2 gearboxes at 3:1, it would probably generate even more power. If I just ripped out the furnace and boiler and attached the motor to the RPS pipe, it'd still make the turbine sounds too. But I decided that while the clutches and flywheels might be pushing it, I would not make this a true cheat machine.
Except for the emergency backup. That's a true cheat, but it's only meant to be used if you hit something and lose all your fuel. :P
All fine and dandy if you don't mind using glitches/exploits, just something worth to consider if the devs ever decide to fix it.
I think enough creations depend on this by now that they'd face backlash if they did. Just like when they made it so you couldn't screw around with pivots to make a boat more buoyant. Too many people would find that their favorite boats just plain didn't work anymore. And without it you have to do what you said, stack about a million turbines up. And one boiler won't provide enough steam for that since a few updates ago. :P No more small steam boats; you'd practically need a full-workbench ship before you'd have enough room.