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Jonathan last won the day on October 10 2015

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  1. Jonathan

    Mooring Up.

    MM, I'm just thinking out loud so tell me if this is a stupid idea! Tie two or three of the "tube" style fenders in series (like a string of sausages). Secure one end to a cleat as usual, Tie a LONG rope to the other end, and walk said rope via the bow, under the keel to the other side. Pull tight and secure to the "opposite" cleat. You now have one or two submerged fenders. The only additional equipment required is the long rope(s).
  2. Jonathan

    Broad Ambition - Underway on the H2O

    Hylander, It may depend on which web browser you are using. I see it correctly when using Edge but pink & green using Chrome. I also tried downloading the mp4 file and that displayed correctly. I wonder if it's something to do with 32 and 64-bit processors because the pink and green looks like a "negative" (remember film cameras?) which is what you will get if all of the numbers are seen as negative numbers (due to missing or adding 32 bits of data).. I guess that I have 64-bit Edge and 32 bit Chrome.
  3. Jonathan

    Recent Poll Of National Parks

    But that's soon to be rectified with the addition of the Acle erection!
  4. Jonathan


    Is this a new computer? Has something changed? Are you using a mouse? If you are using a mouse, then that sort of thing can happen if you have dirt or hairs caught in the sensor. If you unplug the mouse then does it still happen? Check underneath (where the red light shines) to make sure that it is clear of debris. It's probably best to unplug it first! Failing that, there may well be an accumulation of "bits" inside the mouse. If you can take it apart then do your best to clean the mechanical bits and reassemble. A new (USB) mouse can be bought for a few pounds in most supermarkets these days.
  5. Jonathan

    Normal Aa Battery Vs Led Light Question

    Baitrunner, I agree with grendel and regulo, although what neither have said (but both implied) is that the battery box is not wired as you assumed! The top-right corner is negative and the bottom left positive. So: With the top cell displaced you are measuring across that cell, through the circuit and then through the bottom cell hence the 2.5v (there's probably a diode in the circuit hence 0.6v dropped). The "negative" reading is because you are measuring across (just) the middle battery backwards. With the leads reversed it's just over 1.5v as expected. My guess is there's a "short" somewhere allowing a continuous discharge even when you think it's "off".
  6. Ray, I bet the gas oven is looking more appealing now! Another thought: It is possible to buy 12v "slow cookers". They will be no use for "ping food" instant meals, but you could prepare a meal, cruise for a few hours (the alternator would feed the 7 or 8 amps used by the cooker whilst the engine is on), and the food would be cooked when you moor up. With the engine off, this style of cooker would be using less than a tenth of the power consumed by a microwave.
  7. Jonathan

    Bit Of A Stretch

    Well it could be Bridge Broad, just upstream from Wroxham ... but I have not been there for a few years!
  8. Jonathan

    Independence - Updates | Maintenance & Care

    Robin, The ZF manual says (Page 97) "10.2.1 Control Head The primary function of the Control Head is to send out a variable DC voltage to the Processor. This DC voltage is representative of the Control Head’s present lever position.", so it is not a digital system it is analogue from the control levers to the processor box. On page 105 it says "the command signal is between approximately 0.8 VDC at Full Astern to 4.10 VDC at Full Ahead.", so it looks like the total range is 3.3V or about 1.67V either side of the neutral position. If "full throttle" corresponds to 3000 rpm, then there is only about 0.06 Volts change per 100 rpm (less if max' rpm is higher), so the engine variations you have experienced may have been caused by very small voltage changes. Given the long cable runs, the various joints and connectors, proximity of radios, radar, fridges, D.C. motors for pumps etc. I'm surprised it works at all! Grendel has already suggested a noisy potentiometer (variable resistor) may be the problem (like the "scratchy" volume controls on old radios and televisions). If it is possible to clean it, as he suggested, and then the situation might improve, but it should be possible to see the voltage change at the processor as the throttle(s) is/are moved. If it is not smooth then you have found the problem (rapidly cycling the lever end-to-end, with the power off can help sometimes too!). I think that other "noise" in the circuit from other electrical/electronic devices could be a problem, particularly if there is any hint of corrosion or moisture at the joints. It would be very difficult for you to know if the erratic engine behaviour correlated with something else running (e.g. bilge pump), but it's worth a thought. The ZF MARINE web site says: "We have established a reputation for reliable, responsive control systems" So you may get some help from them if you tell them how unreliable it is, particularly if you know that this system has not been installed for very long (from http://www.allboatservices.co.uk and the boat's paperwork). Good luck with the investigations. I don't know where I would even start.
  9. Jonathan

    Independence - Updates | Maintenance & Care

    I agree! Add to that that many extinguishers are almost useless against a fire that has already got a hold and as Jayfire has already said, they can really only help you to get to the exit. I suspect that what Robin has in mind is a fixed engine room installation. He has the ability to close the external vents remotely and if he could then "flood" the close engine room to suppress a fire it might be effective if the extinguisher is big enough (he said "commercial sized version "). On a slight tangent. My experience with "dry powder" extinguishers is that they are effective at stopping a petrol fire, but the powder is quite corrosive, and damages electrical installations.
  10. Jonathan

    Independence - Updates | Maintenance & Care

    I have refreshed the "MarineTraffic" site a few times in the last few minutes. They are only showing 7 or 8 kts with wildly different headings each time, so I'm guessing it's rough out there! I'm also guessing that the 4.5 hrs is going to be more accurate for the remaining time.
  11. Jonathan

    Independence - Updates | Maintenance & Care

    Robin, Just a thought, which I think you mentioned yourself some time ago, with the heavy crane/hoist for the rib on one side it is possible that it will cause a list. It may be that the previous owner kept more fuel in one side to compensate for that, so allowing fuel to equalise through the centre tank might allow it to "lean" a bit! This would explain the "must be kept closed" instructions. If the cross-flow valves are open now then I suspect that this would be obvious next time you visit. Thank you for the frequent and informative updates. I think we (NBN forum readers) are all looking forward to next weekend as much as you are!
  12. Jonathan

    Independence - Updates | Maintenance & Care

    Robin, I think I agree with Siddy on this but I cannot see a connector in the video. My understanding is that you have feeder pipes from port and starboard to the centre tank and that there is an isolator valve at each end of each pipe. I also get the impression that the centre tank is lower than the other two. I would expect there to be a fuel feed from that centre tank, otherwise there will always be a quantity of fuel in it that could never be used. In the video section where you are showing the depth of that tank there is a vertical pipe with a tap that is open. I’m guessing that that pipe is feeding fuel from this tank to something. I am confused as to why you have been told to isolate this tank. There is no way that fuel could siphon from a lower-level to a higher level, so a list cannot develop “by itself”. When the boat is rolling due to wave action then cross-flow would occur, but this will be limited by the pipe size and would not be significant enough to be noticeable before the boat rolls the other way. I suggest an experiment. If you have fuel level “sight tubes”, or some way of actually seeing the physical level of the fuel without relying on a remote display gauge. 1. Close the centre tank valves (as they are now). 2. Check the actual fuel level(s). One side would do, but both port and starboard would be better. Possibly mark the level with a felt-tip pen or a strip of sticky tape. 3. Induce a list! Either get lots of people to sit on one side or use the crane to displace the rib out to one side. 4. Check the actual fuel level(s) again. This might be slightly different as a result of the list. 5. Wait! 6. No levels should change, showing that the valves are closed (or the pipe blocked). 7. Open the four centre tank feed valves. 8. Wait! 9. Check to see if the fuel on the “low” side is going up and the “high” side down. 10. If it does then the valves work. But there may be a restriction (blockage) somewhere. If it does not then either the valves do not open or the blockage is total. 11. Remove the list! 12. The levels (if changed) should return to the marked positions. If there is a restriction, but not a total blockage in the pipe(s) then it is likely that the rate of fuel flow during “polishing” was much greater than the cross-flow could equalise. Unfortunately, the same would be true during refuelling. If there is some flow, then you can repeat the experiment, closing just one main valve at a time and that would tell you that those valves are working. The "worst case" occurs if no fuel flows, because then you know nothing more about the valves.
  13. Jonathan

    Who’s Dropped What In The Broads ?

    I dropped my phone into the Herbert Woods basin as I said at the time: I was VERY annoyed. I had owned that phone for many years and it was not an "expensive" one, but I had intended to contact another friend to meet-up during the week and although the other on board offered the use of their 'phones there was often no signal or no reply!
  14. Jonathan

    Big Changes Ahead

    Surely the tender has to be renamed "May 4th", being the Independence day-boat!
  15. Jonathan

    Let Off Steam In Here !!!!

    Local radio, traffic reporters saying: "...There's delays at ..." when what they mean is: ".. there are delays at ..." or "... there is a delay at...". Common mispronunciation of "Nuclear" (by BBC presenters and US presidents!) as "Noo-cue-lar" rather than "New-clear" (or perhaps "New-klee-are").

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