nicknorman

Most dc dc chargers have some sort of remote on-off input so you just need a low current control switch, rather than a fat isolator switch in the main feed. You can also automate it via the relay on something like a BMV712 that is measuring the Li SoC. If I were doing it I’d probably have a switch to select between BMV712 automatic control, and “always on” to allow synchronising the BMV to 100%. Or a 3 way switch with an “always off” position too.

I think the drawing is unconventional in that the devices are shown across the wires as opposed to in series, but I think the principle is ok. You have shown 15A fuses in the diagram but 150A fuses in the text. The fuse rating should relate to the cable used, so 150A will be fine if the cable is quite thick and rated for that current. I would have thought 250A for the bow thruster was not enough, but it depends on the bow thruster!

A lifepo4 battery probably can’t run a bow thruster as it (probably) can’t supply enough current due to the limitations of the BMS.

No. 14.7v is not that high. But there might be a problem with a field diode. It might go higher under no load so best to sort it and even 14.7v for long periods is inadvisable. Voltage decreasing at higher revs might also pint to a field diode. I think.

The Sterling reg can only increase charging voltage, it can’t decrease the voltage below whatever the alternator’s internal regulator sets.

Best is when 2 boats are coming out of one lock in parallel and 2 boats coming out of the other lock in parallel. One pair holds centre ground and the other pair splits to pass the together pair, before rejoining each other before entering the lock. ’tis a thing of grace and beauty to behold. And what could possibly go wrong?

When sharing wide locks, the correct way is for both boats to enter simultaneously and then there is no need to worry about staying against the side. Unfortunately lots of people seem unable or at least unwilling to do that.

We have certainly encountered single handers who are reasonably expeditious but the only time they don’t hold us up is if every lock is in their favour and of course not in our favour. Single handers having to set ahead has got to be a lot slower than 2 people doing same. I recall having to wait for a single hander to go through a lock on the Avon, it was quite a long boat that had to go diagonal so we couldn’t share. We offered to help but this was strongly rebuffed. I am not kidding (because I timed it) but there was 15 minutes between the top gates being opened and the bottom paddles being raised, the time being spent faffing around with ropes and micro-positioning the boat. We then whizzed through and overtook him in the next reach, taking the time to hand him the windlass “en passant” that he had left lock-side.

Clearly it isn’t feasible that traversing locks single handed could be as fast or faster than a reasonably competent double crewed boat. It is true that some boat crews are incredibly inefficient, but the fact remains that Jeff and I have NEVER had a single hander come up behind us (unless we are held up by the boat in front) and we have OFTEN been slowed down by single handers in front despite helping by eg closing up behind them. Anything else is wishful thinking.

Or engine could fail. But probably if a prop shaft coupling is going to fail surely it’s more likely to happen when hitting reverse at higher rpm, not just dropping into tickover reverse. Telemachus being deep drafted there is already quite a bit of deceleration caused by water displaced in the lock having to find its way past the hull, and the “uphill” water thus created. TBH if reverse did fail it wouldn’t be catastrophic, just embarrassing (bow rides up on gate, as bow slopes relatively gently, it’s a long way from vertical). But as ways to crash go, I think it’s pretty unlikely. There would be time if the boat was in tickover. But our way, the boat is at higher rpm to exit the lock more quickly which more than compensates for the 3 seconds to cross the gate. Not hurrying, just walking. It’s 7 feet and my pace is about 3 feet so that’s 3 steps. If you found that way didn’t work for you, that’s fine. But it works for us. Possibly being a lot heavier and with correspondingly stronger (and testosterone-enhanced) leg and bum muscles makes the difference. Yes. But pushing the gate open with the boat is rather frowned upon by the powers. As the gate opens, the force makes the bow fender rub along the gate and pushes the bow sideways into the lock wall to scrape off more of your blacking. I’m not saying you shouldn’t do it, but it is slightly inelegant.

This is a concern. What we do on entering a narrow lock to go down, is that I go in fairly fast and slip into tickover reverse just as I step off to close the top gate. The boat slows down avoiding hitting the bottom gate as I close the top gate and Jeff is opening the bottom paddle just before the gate is closed. I then hop on and click into neutral. I don’t think the getting off is problematic because if I fell in then, the boat is still moving away quite quickly. But getting on again with the boat barely moving is more so. I am careful, just as I am when stepping across double bottom gates.

Yes you could do that. We should bear in mind that we might be talking about solo ops vs 2 people ops as you haven’t mentioned how the gate is opened or gate side paddle closed. But even if Jeff has gone ahead I would still do it the same - wait for the lock to be virtually ready on the offside, close the paddle, cross over and open the gate and close the paddle, then walk to the boat. Virtually no time wasted, just the time to walk across the gate which is perhaps 3 seconds? One could leave the boat in gear to open the gate by lots of rubbing of hemp against wood, and general scrapery, but that is a rather un-gentlemanly way of doing it.

I have long arms but still can’t close paddles whilst steering. I could close the paddle whilst the boat is steering itself, but why bother? Our technique, which I have been doing since the 1960s (before you were born) works fine for us. You should try it sometime.

No doubt there is the odd very leaky lock where it doesn’t work, but that can be identified by observing the leakage from the bottom. It does work for 99% of locks. It’s what we do all the time and virtually never has opening the top gate been problematic. We don’t like to rub the fender on the gate and Telemachus is a lively boy with an enormous … propeller. So there wouldn’t be time to do that without fender to gate contact. But as I said to Brian, what we do works flawlessly and expeditiously for us. I can’t remember the last time we had to re-open the offside paddle. You should try it sometime!

Travelling between 10pm and 4 am always makes for a peaceful trip! Anyway, you should see it on the CMer’s “Swap Around Tuesday!”.

We don’t have any ladies on our boat! (Other than guests, of course). We find closing the offside paddle, then crossing over and opening the gate, perfectly satisfactory with no desperate pushing, provided it’s timed correctly. Otherwise the steerer has to walk back from the paddle to the helm and then start the boat moving, by which point the gate operator is thinking “why didn’t he get the boat moving when he could see that the gate was being opened?”. I was mildly amused by a couple of fairly beefy chaps on the twin bottom gates yesterday at Stockton Brook, who had foolishly closed both paddles and then struggled to open the bottom gates. Lots of sweating and grunting ensued. I forbore to point out their error (must have been in a good mood!)

Have you ever thought of getting a job working with the Samaritans? Ideally suited, I’d say.

I think it was an opposite direction passing.

They were probably angry that you didn’t give them anything to be angry about.

Keep going in gear at normal speed* and move over quite late, to avoid a prolonged period in the shallows. Only move over enough to avoid contact. It is better to be 6” from the other boat and 6’ from the bank, than the other way round. Some people love to criticise others and look down on people not in their little clique of boat type ownership. They are bad people! My pet hate is selfish and inconsiderate people, which it seems you are not. Everyone has to learn and it takes a bit of time. In fact I’ve been canal boating for over 50 years and I’m still learning! Maybe I’m a slow learner😞 * cruisers don’t displace much water so no need to slow down. In a deeper narrowboat you might want to slow down to avoid sucking away too much water and getting nearer the bottom. You might also want to adjust speed so that your passing of the other boat coincides with a slightly wider (or less narrow) bit,

The connection between the mains earth and the hull is there for safety reasons. Having that connection introduces the possibility of earth currents causing corrosion, and that is why a GI is inserted. So not having the hull connected to mains earth presents no issues with corrosion, only electrical safety. There could of course be another wire from the mains earth to the hull, eg from within the consumer unit. You should be able to check for continuity between an unpainted/uncorroded part of the hull, and the mains earth, using a multimeter set to resistance. The resistance should be very close to zero of course. Bonding the (GI boat side of the) mains earth to the engine is not a good idea as many engines are on rubber mounts, and so any continuity to the hull is by rather dodgy paths such as the exhaust, prop shaft, control cables etc. There should be a dedicated wire from the boat side mains earth to the hull, terminating in a stud or bolt (not drilled through the hull obviously!) to ensure proper electrical safety.

Barrus recommends API CD/SF. Which is very old school. We have a Beta 43 (Kubota engine) with about 5000 hrs and I use API CC/SF oil, which is even older school. Our engine doesn’t give even the hint of smoking and the oil level doesn’t move on the dipstick between 250 hr oil changes. The engine spends quite a lot of time at idle, and at normal canal speeds is probably at about 10% of max power, although heavy electrical generation and rivers can increase this. Since experimenting with oil can be a one way trip, I wouldn’t propose any change and would advise other people to stick with “low grade” mineral oils. You have talked a lot about your experience with engines, but you haven’t mentioned any personal experience with narrowboat diesel engines. Do you own a narrowboat, and if so which engine and how many hours have you put on it?

I did quote your reply and that was because I was responding to it. This is normal practice on a forum. I was not accusing you of giving bad advice because I don’t think you were giving advice. You did however comment on issues the detail of which were not relevant to narrowboat engines, just as you have done in your latest post about high performance motorbike engines. And of course I totally agree with your point about running in motorcycle engines “not too gently”. I disagree with your point about using a semi-synthetic oil in a narrowboat engine that spends a huge amount of time at idle or very low power. And I disagree not from knowledge acquired personally, but from reading the various manufacturer’s advice, which for example recommends a rating no greater than API CF. which is pretty old fashioned low spec. Perhaps you are better informed than the engine manufacturers, but I find that a bit difficult to believe. As a further aside I am familiar with aircraft piston engines, we recently fitted a new Lycoming 6 litre 4 cylinder engine. It’s a 1950s design really (though still being made) and the manufacturer refers to “breaking in” not “running in”, and with straight mineral oil and, from new after a brief period of warming the oil, going straight to full power or at least 75% of full power and holding that for 2 hours. Only after 50 hrs of use is it permitted to change the oil for multigrade. Anyway, all waffle aside, narrowboat engines are run with old fashioned low spec mineral oil. Which can be quite hard to get. That’s it.

Where did I say you did? One of premises of your post seemed to be that with modern synthetic or semisynthetic oils, sludge build up didn't happen. Which is of course true. However as I mentioned, 95% of boat engines owned by people on here run on mineral oil. Therefore your post might be misleading to people who didn’t fully understand the significance, including the OP. My aim therefore was to add clarity and hopefully prevent misunderstanding.

Narrowboat engines including relatively modern ones like our Beta 43, aren’t and shouldn’t be run on synthetic or semi-synthetic oil, they are run on mineral oil.