Fifty Feet of Grey (steel)

Yep, that would give full redundancy, but is it really worth?
As I understand, Rob is keeping an eye also on costs, and while at the moment an AC pump would probably cost a bit more than a second PTO pump, eventually the overall cost would be lower, if hydr STAR stabs will be installed sooner or later.
Fwiw, the single, engine driven hydr pump which I've got onboard is working since 1996, and never missed a beat (touch wood).
 
Yup. I do not know the cost of a main engine PTO plus the extra pipework, and you may well be right. It all depends whether Rob wishes to save cost upfront or total cost over the life of this project I suppose

IF the b/t were hydraulic I'd prefer (but it's only a preference) 2x PTOs because if an engine failed it would be nice to have a b/thruster, as opposed to a 50-50 chance of a b/thruster. But come to think of it Rob will probably be better just fitting a good quality electric thruster

For sure, quite a lot of, perhaps the large majority of, boats have just one PTO as standard spec
 
jfm said:
But come to think of it Rob will probably be better just fitting a good quality electric thruster
Click to expand...
+1, and I'd do the same for windlass/winches, particularly on a 50 footer. But that's me, of course.
Btw, hearing that the boat (ship!?) Rob works on has electric winches for the main bell puts the (often perceived) higher value of hydraulics in perspective...
 
MapisM said:
+1, and I'd do the same for windlass/winches, particularly on a 50 footer. But that's me, of course.
Btw, hearing that the boat (ship!?) Rob works on has electric winches for the main bell puts the (often perceived) higher value of hydraulics in perspective...
Click to expand...

All agreed. One of the legacy things we are a bit constrained by is that 100 years or so ago someone decided 12v was a good standard voltage for automotive things. That became 24v by ganging two battery units together, and much of the world's DC gear that fits our sized boats is built around this voltage. As a result we are limited in electric winch power by the high currents that ensue, and the price of copper. If only the world had settled 100 yrs ago on 48v say, we could all easily run bigger electric winches and the - as you say often perceived - advantage of hydraulics would diminish

Those electric winches on Rob's diving bell are 230v and 3 phases of course (I expect)!

Anyway, there's an idea Rob - build a 48v DC boat! Only, sadly, much of the gear you want to buy wont work, so don't do it!
 
Talking of legacy stuff... Try six volts positive earth....(some old leaky brit motorbikes :)

Anyway, as you will have guessed, theres lots of scope for what to fit, and most of this is also down to what is available in the stabiliser market. If we do go down that route,then i see no point in fitting anything but a full hydraulics pack for everything.
Likewise, if I find an electric system...
But so far it looks like hydraulic.
Until I am sure as to which way we are proceeding, we have lots of options.
The options for hydraulic are permanent pto from gearbox...
Clutched from engine...
So more choices.... Also this depends on fitment of stabs....

Fwiw,the winches are 440 3ph at work. Fairly well substantial bits of kit...

I have photos today of cutting steel. The flybridge and superstructure is on the cutters bench.
But i cant upload... Bloody internet...
I can email if anyone would do the honours though :)
 
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Fifty foot 3D jigsaw anyone :)
 
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Robg71 said:
Likewise, if I find an electric system...
Click to expand...
Rob, I understood in the other thread that you preferred hydr regardless, but if you're open to consider also electric, I can give CMC a call and ask directly it they have something suitable for your project.
Don't hold your breath though, 'cause I think BartW was correct in saying that BA equipment is the smallest in their range (which in turn means probably too big for your boat).
Anyway, zero problems to ring them and check that out, just ask.
 
I did, and still do.
But, at this size it appears to be a case of what is actually in the supply chain... Whats available...,that will dictate i think more than any other factor. I will consider all options...within reason....
Gyros, were out on size...
 
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