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Safe to seal a bow thruster tube with sealant?!
blackrose replied to Poppin's topic in Boat Building & Maintenance
When my widebeam was built Liverpool boats installed the BT motor right in the middle of a 10ft tunnel. I questioned this on the basis there's no weed hatch and how would I clear a fouled BT prop as my arm is only 2.5ft long. They moved the motor to one side under warranty and fitted a curved cover made from a section of steel tunnel of the same diameter over the old holes. They tapped two of the holes and used some vetus gasket material and Marineflex sealant, bolting it up with two M10 stainless bolts. When I asked them why they weren't welding the repair they said they couldn't weld it from the inside and if they just welded the cover on from the outside it would leave a crevice and a corrosion trap on the inside. They said what they were doing was at least serviceable. I ended up agreeing with them although I've never actually taken that cover off while in dry dock to check it, and that was 18 years ago. However, having said all that, I don't like the look of your repair. If you're not fitting a BT I think they should weld the tunnel ends over. -
The bow thruster will/should be operating on the other side to push it in. Then leave as normal without using the BT.
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This is my favourite BT logo because it could be adapted to describe any job that had gone wrong.... Because when you rotate it 90° it becomes "a little cock up" And when you rotate it a further 90° it be ones " a big cock up" And a further 90° rotation results in "a balls up"
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That is exactly how BT wired their isolation transformers (except for the bit about wiring the secondary neutral to the hull, obviously).
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Safe to seal a bow thruster tube with sealant?!
IanD replied to Poppin's topic in Boat Building & Maintenance
Anyone with experience of narrowboating should be well aware of what happens when two boats pass, as you pointed out. I'm sure you can dig out many other cases where the use of a BT is neither necessary nor appropriate, for example continuously when steering a boat instead of using the tiller, like I've seen people do. But stupid BT use by some idiots doesn't change the fact that they can be useful *sometimes* even for experienced boaters... 😉 Which is what I said, immediately before he started shouting at and then threatening me. There are some people who are just unreasonable and spoiling for a fight, who being reasonable with just doesn't work -- I just moved on and left him raving behind me... 😞 -
Just searched “Gypsy Lady” on the boat finder, unfortunately non of the builders are familiar names and I doubt are still in business. Maybe it was Eastern C/vans & Bts
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Noooo, they would suck all the water out and return it at close to boiling point, causing it to evaporate quicker! BT's Baynard House in London used Thames river water for cooling. It was no end of trouble with floating detrius clogging the pump filters.
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Out of touch now, left BT in 2009. For trunk and Junction cables which were installed in 2km lengths the whole 2km had to be replaced if one section was damaged. I assume that if a fibre drop wire is damaged only the drop wire will need replacing. If it is a pole smash or a DSLAM, pronounced DEE-slam, (Digital subscriber line access multiplexer) is wrecked a lot more expensive. Digital subscriber line access multiplexer - Wikipedia -
I just simply put a Positive (+) Jump lead on both the domestic battery and the starter battery (+) terminals (but they are fairly close together) - where is your BT battery ?
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Ray T replied to RichM's topic in Site Announcements
heli·cop·ter view [helicopter view] NOUN INFORMAL (Especially in business) a general survey of something; an overview. When I worked for BT we had a level 2 manager who was full of Americanisms, most of them were avoidance tactics by him. e.g. "No such thing as problems, it is a window of opportunity for you to sort out, not bother me with!" "You are failing to see the big picture." -
Safe to seal a bow thruster tube with sealant?!
IanD replied to Poppin's topic in Boat Building & Maintenance
I've been rammed by one coming the other way who instead of passing closely tried to steer as far away as possible too soon, then got pushed right back into the channel by the shallows near the bank, then panicked... 🙂 I doubt they had a BT (and neither did I) but I don't think it would have saved them even if they did... -
Thats the way the world has changed, when I was a kid the local bus company use to come round with a converted double decker bus cutting back all the overhanging trees so they catch the busses as they passed. The GPO use to cut the trees where they may have rubbed the telephone wires, now BT cables are inplaces supported by trees because the wire lashing has fallen off the post. It cheaper to wait until it breaks and then fix it in lots of cases. -
When I worked for BT they had over 6,500 diesel engines standby generators, mainly relatively new but some dating back to the 1950's and 1960's. They did extensive testing and found that some of the older ones required additional lubrication when run on ULSD to prevent excessive wear of the fuel pumps, injectors were not affected. A fuel additive to increase lubricity was used for these specific engines. However when the 7% bio ULSD became generally available it was found that the lubricity additives could be dispensed with because the bio content improves lubricity.
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That's the same principle where some big companies (BT springs to mind) didn't bother taking out insurance via an insurance company for their vehicles, they just paid out any claims themselves. I believe it saved them a lot of money and avoided a lot of disputes and paperwork. But you have to have deep enough pockets to pay out any losses and claims... Third party insurance is needed for boats in case of a possible massive claim for loss of life or damage, but comprehensive cover probably isn't a good deal for a lot of boaters as @MtB says -- so long as you can afford the loss should the worst happen.
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Discharge test are the only test that BT found acceptable for batteries. If the normal load is a high drain for a shorter period @M_JG can do a discharhge test at a higher load for a shorter period.Conductance tests are unreliable on older batteries in my experience. BT used to specify batteries with 25% more capacity than needed and replaced when the capacity fell go 80%, so always equal to or greater than the design load. However for non-critical loads only the user can determine what is no longer acceptable. For example the batteries on my boat (Lifeline AGM lead acids) are 15 years old and down to 50% capacity, but as I can still moor for 48 hours without having to recharge them, I find them acceptable to me.
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Safe to seal a bow thruster tube with sealant?!
IanD replied to Poppin's topic in Boat Building & Maintenance
And like I said, there are times when no amount of thinking ahead or experience can prevent this happening -- like the case I described. I've done a lot of boating over the years and like to think I'm quite good at it, nothing satisfies quite like sliding into a tricky lock without touching the sides, but there have still been times when a BT would have been damned useful... 😉 -
Safe to seal a bow thruster tube with sealant?!
IanD replied to Poppin's topic in Boat Building & Maintenance
https://www.cactusnav.com/thrusters-c-1118_5699_5739_5740.html Almost all are single-prop... 😉 Maybe because with a twin-prop one you typically need access from both ends of the BT tunnel, which is well-nigh impossible if it's more than three or four feet long like most are -- a single-prop one is fitted near one end with the prop facing the short tube... 😞 -
When I bought my canalside house on the Coventry Canal I specifically asked my solicitor to look into ownership, maintenance and access of the bank. The response I got was that they own the concrete piling and are responsible for its maintenance but I have to allow them access to the metre of my garden adjacent to the canal. I think that with VOIP (voice over internet protocol) supposedly imminent, they have adopted a policy of not maintaining anything that will soon be obsolete because it is cheaper to fix the odd failure than maintain things shortly to be sidelined. Knowing BT they will have got rid of the group I mentioned earlier, to save the wage costs, given that there will be fewer overhead cables to maintain once VOIP is fully implemented.
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BT used to take their wet lead acids down to 0% every two years to assess actual capacity. They used to last 25 years, but were good quality batteries that spent most of their time on float. It is more important for the battery to be either discharging or charging. They very quickly be sulphated with hard (irreversible) sulphate when left partially discharged for any length of time.
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Safe to seal a bow thruster tube with sealant?!
IanD replied to Poppin's topic in Boat Building & Maintenance
They weren't happy, did the "bloody hire boat, what's the reg number, I'll report you to the base" BS. Didn't like it when I pointed out they were moored in a stupid place. A BT would have avoided the contact and the resulting shouting match, and made for a pleasanter day. There have been other occasions too like fierce lock bywashes -- yes you can usually go in at an angle to avoid contact, but not always. -
The data centre planners I worked with 10 years ago were very conservative. Since 1980 BT had used fresh air to cool its equipment for 85% of the year, but when I suggested it to the data centre planners they were very negative. Perhaps the current energy crisis will persuade them to consider less wasteful ways of cooling?
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Safe to seal a bow thruster tube with sealant?!
IanD replied to Poppin's topic in Boat Building & Maintenance
I've certainly managed without one for getting on for forty years of holiday boating, a couple of thousand miles and a couple of thousand locks. There have been times when one would have been damn useful though, usually involving crosswinds or currents. Looking down your nose at BTs is like doing the same for auto gearboxes -- "real men drive manuals". You don't *need* one, but it can make life easier sometimes... 😉 -
Safe to seal a bow thruster tube with sealant?!
blackrose replied to Poppin's topic in Boat Building & Maintenance
But they're not proper in terms of the job. As lots of people keep repeating, if a BT isn't being installed then the tunnel or tube ends need plates welded over them. That's the right and proper way to do the job. Those bungs are just another bodge. Because if it isn't sprayfoamed it will sweat. My tunnel wasn't sprayfoamed when I got my boat and it's surprising how much condensation came off it. I sprayfoamed it myself with a can. Problem solved.
