TNLI

Only if the boat is an almost exact fit in a very narrow channel. Oddly enough the actual draught does reduce in a significant manner in shallow water at speed. That's why the QE2 ran aground once. A boat does need more power in shallow water, but the hull speed remains the same. This is noticeable in a flat bottomed canal boat hull but not a yacht.

Umm, it will only take twice as much power to do 3.5 rather than 3mph if the hull speed is around 4 mph. The last 20 odd percent to hull speed is real bad news in fuel economy terms. Hull speed in kts is 1.35 times square root of the waterline length in feet.

Good to hear all is well, and as regards the dipstick that rebuilt the pump. "Next time Specsavers"!! Looks like my guess of dodgy injection timing was correct, although I'm surprised it was the pump itself.

Does it smell of diesel or oil ??

Now this looks better, as they do a full range of NiCd batteries: IBL Industrial Batteries | Saft Batteries | Saft Ni-Cad Batteries (ibluk.co.uk)

Thanks, I got it the other way around, but still can't find the elusive 12V marine NiCad, or NiMh that was sold by UK chandleries a few years ago. I will eventually need 8, and 2 10hp, (7.5 if you don't like electrical smoke), go cart motors, (48V). Rough plan is to use one until one bank is flat, then switch on the other motor. 2 small diesel gens sets in the sealed fwd cabin. That means I can suffer the failure of one side but still have the other available. In fuel efficiency terms, no better than an old BMC. Not buying anything yet, just researching where to buy batteries from.

Missed out a second link that was supposed to be above the comment, as it was for a similar black battery. LiFe and LiPO4 are different types. If it has both and you tap on the wrong blue teeth button on your mobi, it explodes then turns into a ball of toxic smoke and fire. In fire fighting terms, all you can do is jump for the bank or into the canal, don't try a fire blanket or dry powder. Fit a burn through tube from a thru hull, then wait for the battery bay to flood before leaping back and closing the seacock.

No, you just need to fully discharge them every now and again. Well proven safe deep cycle technology, but around twice the price of a lead acid sealed deep cycle. NiMH are supposed to be better than NiCad, apart from higher self discharge rate.

Fleabay: 12V 100Ah Lithium Leisure Battery campervan / RV / marine E-marking BLUETOOTH | eBay Now this one is odd as it says LiFe/LiPO4 and the first one is a potential bomb, and the second is potential a difficult toxic ball of fire if you download the wrong App or suffer a loose connection. NiCads are good and you don't need expensive chargers or a blue teeth.

I did not know Sterling power were in China, and it says Unit 8, Wassage in Blighty for the one man and a dog marketing company, so is that where Sterling power reside ?. No chance of tracing the actual Chinese manufacturer. I'm still looking at which small 28 or 48V motors to use, if I decide to sell my beloved BMC 1500 cos by go green daughter does not like diesels. I'm going to finish the engine rebuild and keep it in the garage whilst changing tack to the forward cabin interior. Just cos it says LiPO4 on the case, does not mean it is, they make very good quality labels in China. I don't think this battery includes an expensive BMS, but will take a look at the required charger.

Microsoft Word - LiPo_battery_safety.docx (uvm.edu) The only difference when the BMS fails and the battery over heats, is that a LiPO battery catches fire, rather than explodes. The complexity of the wiring and even software associated with LiPO batteries and regen drive systems is nuts in reliability and safety terms. There are a very few companies in Germany and the US that do seem to make more reliable LIPO systems that are waterproof and fail safe, but they are incredibly expensive. The other so called LiPO expert companies are just selling imported far Eastern junk. It's worth reading the warnings on the right side of this Fleabay LiPO4 special. The internet search engines go nuts when you type in 12V Lithium battery, which I find very irritating, as no one is checking the safety of the new imports or if they are real LiPO4 batteries or not. No checks on all the waterproof BMS systems to see if they really are suitable for a boat. It's only the fire brigade and insurance companies that are trying to reduce the number of fires. Force 4 were selling a very nice 12V marine Nicad a few years ago, but I can't find it online. Anyone know where that type of 12V battery is being sold??

Accident Investigator Cites Lithium Liabilities (substack.com) Very interesting if you are thinking of using Lithium batteries that's one funny but true article. The fire from lithium batteries cannot be extinguished by conventional suppression agents, so you’ll need to figure out your own system. Vast quantities of water seem to work. So, you could install a dedicated sensor, through-hull, water pump, and flooding software. I’m sure that someone will figure out a Bluetooth-connected app so you can remotely sink your boat to prevent it from burning.

Amerex 2.5 Gal. Water Extinguisher with Wall Hook - Model 240 (Part #0 - Beacon Fire Supply OK, so if you want to buy the real thing, it seems that you have to order it from the USA, as the link is for the exact fire extinguisher I have, which can be filled with a mixture of anti freeze and water if you live in the artic, otherwise the lower temperature limit is 40f for an extinguisher purchased in the UK, although the pre filled ones contain some kind of fire retardant that makes the water more effective. The US ones are shipped empty. If you are interested in buying one, ask the UK dealer what the score is, as it might be the same model, but for legal reasons they can't say it can be recharged by the user. You can pump them up with a good car foot pump, or plug in electric pump, BUT it takes quite a while, and can be done far faster at a garage or fuel station air line.

Thanks, so am I right to think that it can be adjusted with one screw, or do you need to adjust both settings to avoid a wrong mixture issue ?? I have vague memories of a trip with an uncle nearly sixty years ago along the lower grand union canal and he was an expert marine engineer, as he fiddled with something on the Perkins that made the hired canal boat go faster. Some of the folks fishing or walking along the banks started shouting insults about the bow wave sweeping along the bank.