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Theo

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Everything posted by Theo

  1. This post cannot be displayed because it is in a forum which requires at least 10 posts to view.
  2. That, to me as an ex physics teacher, looks all wrong. Iron does not concentrate current. It has a higher resistivity than copper or aluminium but the current will be distributed through iron in the same way as through other metals. Hm... I had ignored the skin effect. Thanks all. As said, more research required. N
  3. I have been cogitating on the idea of an induction hob on the boat. We have recently bought a new cooker for our house kitchen with an induction hob for the house and have fund it completely excellent. I have looked up the literature on how they work and all the articles say that they work by the induction of eddy currents in the base of the pan. If this is the case they should work perfectly well with any metal pan. This is not the case. They don't work with thick or thin ground based or otherwise aluminium pans. AFAICT they only work with ferro-magnetic based pans. We have one or two cast le Creuset pans and they work perfectly. The new ones that we bought are, presumeably, a ferro-magnetic stainless steel. This indicates to me that eddy currents pay little part in the heating. It also indicates that a more likely heating effect is by the repeated magnetic cycling giving rise to hysteresis "losses". When we use our new pans on our induction hob they make sometimes make a low buzzing noise as the coils in the cooker are energised. I would be really interested to hear other people's views on this. Nick
  4. Thanks, Tony. Always helpful and to the point! Nick
  5. Sorry to be really late replying, Tony The bearing is really loose. There's lots of lateral play, but, and this I don't understand, it's not leaking around the bearing. Very strange. Nick
  6. ...on a BMC 1.5 What sort of sealant should I used for between the gasket and the steel? Will boss white do? N
  7. This post cannot be displayed because it is in a forum which requires at least 10 posts to view.
  8. Ditto. As long as I could get one with a couple of spare holding tanks.
  9. Sorry. 😕 Moderators, please delete this topic if it's all been said too often. N
  10. I'm going to bite and be prepared to be shot down. We have 50ft chain and 40ft rope. I do wonder if that it really enough on the Severn but I hope that as we approach the weir the water get shallow enought for the anchor to bite.
  11. Having just come up the Severn and the Avon the fact that my cooling water pump has just failed emphasized how important it is to have an anchor ready to be deployed. We are on the North Stratford now and the engine cooling water pump is defunct but it is a manageable problem. If it had happened on the Severn and we hadn't had the anchor ready it would have been life threatening. On wide rivers like the Severn and the Trent we have the anchor at the front. On these rivers, if you are going downstream there is room to be brought up and swing round head to the current. On narrow rivers like the Avon and the Soar we have the anchor at the stern if going downstream. Not ideal but better than being unable to turn and wedging right across the river with the current trying the capsize us. I know that this topic has been aired before but I think that it's worth saying again that on a river an anchor is an essential piece of safety equipment and needs to be ready for deployment in an emergency. I frequently pass boats with the anchor neatly stowed on the roof with nothing attached to it. Even if the crew know exactly where the chain cable and warp is it will take several vital minutes of panicky work to get it ready to deploy. N
  12. Tempting just to say the former. Certainly not the latter. The former but leavened with common sense would be good.
  13. Recommendations for a good inspector near to Tardebigge? Nick
  14. We saw you, too, on the Avon, and you kindly warned us of the stoppage on the Stratford. I didn't twig soon enough to realise. Nick
  15. Probly a good plan mrsmelly. Next question. Does anyone know a suitable person to do the job near Tardebigge? N
  16. I really do need to sort out the horrid state of the engine hole. The issues as I see them are: I had a leaky exhaust pipe which sooted things up a bit. There is lots of frass from the drive belts. The swims need painting scraping and painting What's the best way to start? Steam clean? Will that damage the electrics? Solvents? Will they damage plastic bits? Polluting the cut should not be a problem because I han direct the bilge pump into into a plastic can. All hints and tips gratefully received. Nick
  17. I have solar with a Victron SmartSolar HQ204684PFB controller and an Adverc. I don't think that either of these are adjustable for a lower charging voltage. I will have another look to see if I can disable equalisation if this is advisable. The Adverc manual says that it keeps the charging voltage down to 14.4V alternating with 13.something. The 14.4V is OK for the batteries. The error starts showing when we are an hour or so into the day's cruise and the SG is showing about 97% SoC. I haven't seen the voltage go over 14.4V. It seems to me that I can disable the E03. Am I correct? N
  18. Thanks, Matty. Are Simply bearings local to you or online? Nick
  19. This is the overvoltage error for the battery type selected. Gibbo said years ago that type 2 ws the right one for my batteries. At what voltage does E03 start to show? I can't find it in the paperwork. N
  20. Thanks all. Lots of useful advice there. N
  21. Theodora has a triple drive belt from the gearbox to the prop shaft. I have jsut replaced it with the spares that I keep on the boat and now need to buy a new set. Trouble is there is no legible code on either the old set or the new set. So what do I ask for? I would imagine that I would cut oneof the old belts so that I can measure its length accurately and measure the width of the pulley groove. Will that be enough information to give to the supplier? They are a bit of a sweat to replace. What do you think of the PowerTwist belts? Being able to "break" the belt would save my having to unbolt one of the Plummer blocks. N
  22. Ditto Not a good idea to put sea water into a sensitive FW habitat. However a commercial advantage would be that you could load the ships more heavilyif the cana became saltwater instead of fresh.
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