magnetman
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Posts posted by magnetman
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It seems an interesting approach to me.
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15 minutes ago, nicknorman said:
Yes just add a resistor into the field circuit. Around 4.25A maximum current at 14v seems fairly typical for a boat alternator field current, ie a field resistance of 3.3ohms. To limit the current to 2.5A (alternator limited to 60% of maximum output) you would need to increase the resistance to 5.6 ohm, ie add 2.2 ohm resistor. 2.2 ohms at 2.5A will dissipate ~14 watts. You could use a 25w resistor but I would choose a 50w wirewound chassis mount one, and it would need to be on a heatsink/metal plate because it would get extremely hot even at 14watts if not so mounted. I've been saying this for years, but I don't think anyone has ever tried it.
Water cooled could be interesting.
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LTO batteries are interesting
I am also intrigued about the suggestion of using resistors and heatsinks to alter the voltage and current out of the alternator. It seems that if done nice and tidy this could be a better solution than the iece of wire .
Putting the resistor in a water heating system seems interesting even if it is not going to be much power .
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https://www.sleeman-hawken.com/sabb-l4-lister-petter/
sabb
3 minutes ago, Peugeot 106 said:It’s Lister Petter LPW 4 cylinder 40 bhp build 48 (marine build) built in 2007 also known as Canal Star or Alpha. All spares Manuals etc available from Richard at MES Midlands or Sleeman Hawker Dorset and others. Manuals and Parts List also available online FOC
I
A similar topic came on here quite recently.
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Is this the Mitsubishi Lister ?
No its a Sabb Lister
The engine Plate is glued on not riveted.
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No. Can't stand gloves and I'm not wearing no mask either.
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Old Z drives are a bit of a nightmare.
The gearchange dog clutches go and they sometimes whine terribly.
I would much rather an outboard also with an outboard you get a bit more space in the actual Boat.
It is feasible to find a Boat with a nackered inboard and Z drive then get the transom rebuilt and put an outboard on it.
Modern 4 stroke outboards are lovely and quiet and also economical but of course petrol is generally more expensive than red diesel and harder to get canalside.
It depends on the intended running hours.
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19 minutes ago, rusty69 said:
What's wrong with a bucket lad, or just wash your hands in th river. You could even empty the contents of the bowl over the side by simply lifting it..
Frankly ,i'm amazed you want to wash your hands anyway. Anyone would think there's a woman involved here.
I was shocked as well.
Its just that the River is now on fact an open sewer so it seems wise to up the hygiene a little.
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I've been considering putting a small sink in the shopping launch due to occasionally having dirty hands.
The general idea seems to be to get a ss dog bowl or similar for this as it is going to need to be smaller than standard products and cut a hole in it for the drain but I am wondering what tool to use for the cutting..
1mm is stainless. A bit awkward.
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The red key on the top might make People think it does something.
Just now, Alan de Enfield said:It's toast !
Crumbs ! What have I done.
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1 hour ago, MtB said:
FTFY!
What is the object of a battery isolator switch?
is it just for fun or a piece of safety equipment?
What happens if there is a large unexpectedly large loaf on the battery and the switch gets welded closed by high currents?
This could be a bit nasty and call for disconnection.
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Isolator switch
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I remember the heady days of the C of C when it was all rather voluntary.
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300 Ohm resistor?
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7 minutes ago, TheBeesKnees said:
Hello all
also any in point we will great if you think this wouldn’t make it harder to drag or anything.
I think if you are serious about this idea the best thing would be to measure the diameter. They do vary.
If a Boat was taken by someone else with a Boat they could put it alongside and the rudder position would not make a great deal of difference.
If they were hauling it by hand you could walk along the towpath and find them.
GPS trackers are available for dog collars.
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55 minutes ago, nicknorman said:
Maybe you should get some sleep, it must be incredibly tiring to always be right about everything.
Being right just comes naturally to me.
Its no bother at all.
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LTO.
Brilliant !
Cuts out the problems
I wish I had bought all of them except I have no use for more than about 10.
Its great being a rebel with no BMS or balancer.
Live life on the edge
I don't even have a can bus !
Or a 0v reference.
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4 minutes ago, nicknorman said:
What happens when the water has all steamed off?
A tiny circulation pump and take it to a little calorifier for hot water to wash hands.
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46 minutes ago, nicknorman said:
You have to consider the heat dissipated in the “resistor”. A short length of rod with resistance 1 ohm and 100A is going to dissipate 10kw! Apart from anything else, 1 ohm is far too much as it would drop 100v. More realistic would be 0.01ohm which would drop 1v at 100A. But that is still going to dissipate 100w and will get extremely hot. This is why a long wire is the preferred choice - the longer the wire the more scope for dissipating power without getting too hot.Threaded rod seems interesting as it is sort of formed like a natural heatsink.
Maybe a rod through a cylinder containing water.
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This was an interesting comment on another forum in a thread about using LTO batteries as starter for a vehicle.
Obviously the internet is like liquorice and there are ultracrepidarians all over the place but the M6 rod thing did pique my interest and raise an eyebrow.
M6 is a thread not a diameter.
So presumably the suggestion is to somehow connect a length of ss M6 studding in the charge line from the alternator.
would this really do anything ?
If it might work then one could use ring crimps with 6mm holes and nyloc or binx nuts to clamp the wires to each end.
Extending the idea a little more one could have a 1m length of the said studding mounted onto Stauff clamps (nylon hydraulic hose clamps) and experiment with clamping one of the wires at different positions.
A variable resistor?
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11 hours ago, DGP said:
Hi All,
I'm new to the forum and am a very newbie to boating. I'm looking for some advice, please and apologies in advance for any incorrect terminology:
I'm trying to plan a narrowboat / canal midweek (three or four nights) trip in spring / early summer 2024 for a mate of mine, me and my dog. I've looked at lots of rental company websites, all of which look great, but I'm looking for some independent advice rather than these sites' insights to their own view of "best short trip with locks, nice countryside and pubs", which is inevitably based on areas close to their bases. Faced with lots of great info, I'm finding it difficult to choose, and maybe this request will help or make the choice more difficult, but here goes...What am I loooking for is tricky to define given this will be a first trip for all of us (including the dog), but in my mind the boat will be straightforward to use (probably a narrowboat with 4 berths so my dog and I have a "separate" space near an access hatch) and the canals not too tricky to navigate, but with enough locks, countryisde, pubs and other canal users (maybe not too many) to make it a successful, relaxing, "bucket trip" type holiday / taster. There would also need to be fairly ready access to dog walking places - the dog is a spaniel and probably needs to stretch his legs a bit more than a jog along a tow path.
In terms of travel to and from the rental location we live in the M3 / M4 area to the west of London. Travel anywhere in UK would be ok in principle and we'd anticipated a shore-based stopover at the start or end of the 3/4 days on the canal to be able to fit in with boat rental start / end times.
Many thanks in anticipation,
David & Rolo (the dog)
River Wey is very nice. Local which is helpful. Its a relaxing waterway not too busy with pubs, countryside, main town (Guildford), visitor attractions and a pleasant feel.
A great holiday waterway for a short break.
Have a look at these
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1 minute ago, peterboat said:
... where is the promised bung?
Is your Boat sinking ?
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Thank god the CRT saw sense and replaced their logo.
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The 'nose' on the bow doesn't look like Allens. It seems more similar to Hancock and Lane or Swanline but I don't think it is either of those. There will have been another shell supplier for Teddesley.
Cabin shape looks a bit like Dartline.
GRP v Steel
in General Boating
Posted
I am quite intrigued about this. I think the Honda 10 has a 12 amp charging coil. I have not done any experiments with the 10 on the shopping launch but it may be that this charge comes out even at tickover. The engine itself is remarkably quiet and frugal running at tickover so IF it was feasible to pull 10 amps at say 14v it could be quite an interesting generator.
Not sure how they react to long run times at tickover it may be a bad idea but these small Honda twin outboards do seem to be remarkably good power units. I would like to experiment with one as a standalone generator perhaps with a permanent magnet alternator on the top.
Quiet, clean and water cooled.