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MoominPapa last won the day on January 23 2017

MoominPapa had the most liked content!

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About MoominPapa

  • Birthday 11/12/1964

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  1. Aceleron - repurposed lithium batteries for boaters

    I've been getting regular lifts in a Nissan LEAF whose owner is a bit of a geek, and has a tablet installed connected to the car systems and displaying real-time data on the batteries. Whilst the 80-90 mile range on the LEAF is pretty marginal, it's very interesting to see how the battery pack performs, and it would make a superb boat battery. Fast charge (We saw 40Kw on a service station fast charger) and good for high discharges when needed. Long cycle life, and no problems with not fully recharging. In fact, it's better to not fully charge. The LEAF charging system has a button to press if you really want 100% charge for a particularly "long" journey. The default cutoff is 85% because that's kinder to the batteries. As a livaboard, I would certainly consider spending two or three times the cost of a decent lead-acid bank for a properly engineered Lithium bank, but it would need to be properly engineered, with a suitable smart charge/discharge system. Such a thing in certainly possible and modern power electronics could convert the output of an alternator and/or solar array with no problem. You'd likely need the battery system to be in complete charge though: no more paralleling batteries and alternator. The batteries will have an input terminal and an output terminal and be responsible for all power flows in the system. I'd also probably want the batteries in a steel box, vented overboard, like Boeing had to do on the 787 after a few self-imolation events. MP.
  2. Parking Stoke Bruerne

    Due to dentistry nightmares, we're going to have to keep the car with us for a month or so after we leave the marina winter mooring, so we need places en-route to park the thing. Are the car park at the back of the museum at Stoke Bruerne and/or the stuff near the bottom of the flight available to boaters? I've never bothered to look, but I'm sure people here will know. Cheers, MP.
  3. Interesting details from the bottom of a lock.

    It seems to have been thought out fairly carefully. The guards are not simply grilles across the entrance to the tunnels, they're substantial box-like constructions maybe a metre cubed with grilles top, front, left and right. The top grille is above normal water level. It looks like it would be impossible for a human body to simultaneously block enough of the entrance area to be stuck irretrievably against the culvert by the water pressure. Cheers, MP.
  4. Interesting details from the bottom of a lock.

    The culvert inlets are now protected by permanently installed guards.
  5. Interesting details from the bottom of a lock.

    Even more scarily, it was the other way around. She fell into the side pond, and emerged in the lock. Very fortunately, the lock was occupied by a short boat. MP.
  6. Interesting details from the bottom of a lock.

    We know how to live....
  7. We're having a few days out of the marina, and currently moored at the top of Foxton, which is having a CRT open-weekend, where the public can visit the bottom of the drained locks. I noticed this feature, which I thought might be interesting to you peeps. First picture shows the outlet from the upper side pond on the left, where the water comes in. Opposite it is a recess in the wall which breaks up and disperses the flow to avoid the boat getting bashed around. Second picture shows the recess in more detail, with the wrought-iron support for the brickwork above. Finally, the third picture shows what's in the bottom of the short pound halfway down the flight. All those black "sticks"? Side fenders. Dozens of them. I always thought fenders in locks was a silly idea. Cheers, MP.
  8. DIY Docking

    Our insurers don't require a hull survey as long as the boat remains in the same ownership, and is continuously insured with them. At 26 years old, I certainly look carefully when we DIY the blacking, and I'm considering getting a hull survey this year. Not because I expect a problem, but for the purposes of long-term planning, for instance of work best done a further two years down the line. Cheers, MP.
  9. Are the Canals going to Last?

    But lengthsmen existed in the days when manual labourers. such as they, were paid peanuts, so you could afford to have one for every five miles of canal. If you paid the same now, nobody would take the job, and if you paid a 21st century wage to enough people to have a lengthsman for every five miles, you'd be bankrupt. The lengthsman system existed, at least in part, because of lack of transport. A man maintained the length he could practically walk to from his home. The canals may be pretty and historic. but they exist in the economy of today. Labour is expensive because its two orders of magnitude more productive than it was in the 18th centrury, transport is cheap because good roads exist and there's an industrial economy mass producing vans and diesel. You can't ignore either of those facts. ETA. If you take advantage of another fact of 21st century economic life, you can have lots of people around looking after things, especially at locks. Said fact being the existence of huge numbers of retired baby boomers with good health and good pensions, who are looking for something to do, and don't need paying at all! Hence the genius of the volocky scheme. MP.
  10. Are the Canals going to Last?

    The same could have been said of the stretch in Rugby by the old water point and VMs. Indeed I did say exactly that. It's now been fixed. The canal is deteriorating all the time; that's the nature of the beast, so you will always find sections which are close to needing work.The question is, does CRT notice, and is it able to fix the deteriorating bits in time? The existence of stuff which has not yet been fixed, but has not yet failed catastrophically, is not evidence that it doesn't or can't. Cheers, MP.
  11. Places with a bad reputation that don't deserve it

    and stern gland grease - allegedly. MP.
  12. Places with a bad reputation that don't deserve it

    In the eastern flatlands, where the guillotine gate rules, it's the height of anti-social behaviour to raise the the gate just as far a necessary to slip underneath, rather than the full travel. The next boat to come along should be paying attention. but often they're not. MP.
  13. Prm 150 and propeller shaft weight

    I guess the downward gravity force on the bearings will be fairly insignificant. What matters are the forces to accelerate the shaft and prop as it goes into gear or, worse, goes from forward to reverse and vice-versa. To get some idea of that you'll need to know the moment of inertia of the shaft and prop, which is related to, but not the same as the weight. A kilo at the end of a propeller blade counts for more than a kilo in a shaft which is close to the axis. MP.
  14. Coalbrookdale Little Wenlock glass channels

    We have a Little Wenlock Mk11, and the glass is (and always has been, in our ownership) sealed to the door. The stove was already installed and like that when we bought the boat. It works fine, It will go out with the spinner closed, which I regard a safe behaviour - can't all stoves be shut down by cutting off the air? The output varies between minimum at about 1/4 turn open, and flat out at just over one turn. If you are right that there's supposed to be a gap round the glass, I suspect that the lack of that causes this stove's sole vice - the glass goes black very quickly and stays like that. The tops crack because of build up of corrosion product in the slots where the sides slot into the underside of the top - the rust has greater volume than the iron it came from and forces the sides of the slot apart. This cracks the top along the slot and moves the sides outward, opening the joints between the side and the back. I suspect that if you took the top off every five years and cleaned out the slots then reassembled it, it would last forever. I, like you, didn't do that and had to replace the top. Cheers, MP.
  15. HS2 canal crossing points

    Looks fantastic in the mock-ups, but like all concrete structures in the damp UK, it will soon be green, stained and damp looking. Pale concrete surfaces work great in southern California, but it rains too much in Britain. MP.