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jonesthenuke

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About jonesthenuke

  • Birthday 01/19/1959

Profile Information

  • Gender
    Male
  • Location
    Kent
  • Interests
    Gardner 3LW

Previous Fields

  • Occupation
    Engineer
  • Boat Name
    Ivor
  • Boat Location
    Kinver

Recent Profile Visitors

2339 profile views
  1. I was thinking by reducing the local ambient rather than reducing the current being delivered, I rather assumed you would want to maximise that. Can you insulate the surface of the skin tanks so they reject less heat to the air near the alternator or is the engine the more significant heat source? My engine is in an engine room and the skin tanks are not close my so the problems are less significant.
  2. It's generally a good rule but for well designed products its unlikely to apply as stated as the designers should be using materials that are operating well below their limiting temperatures and such effects are then low. It's more likely that the temperature will affect lubricants etc and thus bearing life. Personally, though, I would not want an alternator to be updating at near 100C in normal operation.
  3. Good question and I have been searching their (generally helpful) site for such info and have not found any. As they are discussing the temperature regulation I would think it may be the temperature of the regulator but cannot be sure. Can you reduce the operating temperature in any way? I have fitted some computer fans to cool the alternators on our boat. IIRC they run a lot cooler than yours, I wanted them to run cooler just to improve longevity and it was easy to accomplish.
  4. Do you know who manufactured the alternator, the OEM may have details. The alternators on our boat are Leece Neville (Prestolite) For the specificities alternators that are fitted the specification of output is given for two conditions 25C and 93C (Ouch!). In addition the general specifications of their alternators provided this information: 2.10. The regulation voltage is affected by the temperature coefficient of the regulator. This is normally a negative parameter in the range -5mV/K to -15mV/K and has the effect of reducing the battery charging voltage as the regulator temperature increases. This assists in matching the alternator voltage to the battery temperature characteristic. The exact value is regulator dependent and may be obtained from Prestolite. The selected parameter must be correctly matched to the battery type and operating conditions to avoid under or overcharge conditions. If yours is similar you will see a significant voltage reduction at the temperatures you have measured (0.9V for a 60C rise in temperature) and this may explain your current changes. Leece Neville also give curves showing the current output and for the specificities alternator we have the current is a max of 90A at 25C and 83 at 93C, so there is another effect at play as well. I Note Tony Brook's comment on current being much higher if the delivery voltage is low, this may not be universally applicable, the Leece Neville alternators are auto current limiting so will not double in current for a 6V battery voltage.
  5. Yes but consider the original post. The advice requested was essentially whether it's an immediate problem. Oh and I agree that BT's are not works of the devil!
  6. Well these guys know how to fix bowthrusters
  7. Whilst perhaps entertaining to say I ran off, I am still here. My post said don't panic. The situation will need dealing with but 2.5 mm will not perforate in the short term.
  8. I would be happy to take them off their hands if they are now surplus to requirements. I have been looking for some for the garden.
  9. I only know about this issue as I have worked in Power Stations for the last 40 years. From about the 1980s onwards electricity companies took this seriously, including checking refurbished transformers and oil supplies for traces of cross contamination.
  10. If you ask the supply company its Poly Chlorinated Bi-phenyls. Yes nasty stuff if it was used, but it was not common. Transformers known to be if risk used to be labelled, so it may be worth looking for any notices. If you ask the seller of the property you will probably(hopefully?) get a blank look.
  11. I would not worry about it, however it's clearly taking up part of the garden and will have some nuisance value, so is this reflected in the price of the property?
  12. There is another stretch of bank that has previously slipped near there, adjacent to a bridge and last time we passed it was still just covered with a tarpaulin. Whilst some of the canal is cut through the sandstone in other areas its a soft sandy bank and thus liable to slip. Unless there has been specific sighting of a water leak from the water main mentioned above, I would not be surprised if the bank slipped and caused the pipe breach rather than the other way around.
  13. Sadly, The Vine in Kinver is now a pretty poor place. Often empty after 8pm and shut by 9pm Hygiene rating of 1 last year http://www.ratemyplace.org.uk/inspections/the-vine-inn-kinver Hopefully it will improve as it used to be much better.
  14. Seems to have been a landslip blocking the canal https://www.kidderminstershuttle.co.uk/news/17470262.video-shows-landslide-into-canal-near-kidderminster/ Notice Details From Date: 1st March 2019 at 14:00 To Date: until further notice Type: Navigation Closure Reason: Vegetation Description: A landslide has caused trees to fall into the canal and block navigation just above Wolverley Locks. As a result, this section of canal will be closed until we are able to remove the trees. We apologise for any inconvenience caused. Location: Staffordshire & Worcestershire Canal Starts At: Lock 8 Wolverley Lock Ends At: Lock 8 Wolverley Lock
  15. Gardner 3LW The sound is not great on this but it gives you an idea, engine speed quite slow as approaching another boat.
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