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Scholar Gypsy

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Scholar Gypsy last won the day on April 1 2014

Scholar Gypsy had the most liked content!

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  • Occupation
    Retired Civil Servant
  • Boat Name
    Scholar Gypsy
  • Boat Location
    Ely, River Great Ouse

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  1. There's a Thetford porta potti inside, so it must be a boat .... (or a caravan, I know...)
  2. I suspect it's a matter of quantity / economies of scale. As more units are produced, the unit price will reduce.
  3. Here's a video by Rosemary Mills on the "spotted on the wash" Facebook group. Also a screen scrape, looking upstream. The water is overflowing the inner gate (the narrowboat has sensibly moored as far from the gate as possible!), and over the lock wall between the lock and the sluice. I think it has to get a bit higher before it comes over the top at Salters Lode. https://www.facebook.com/groups/792805894253867/permalink/1327127397488378/
  4. Yes, a fair point. I read it that the floating off was the tricky bit, on locations like this a flood tide can generate a very strong current that - if it is in the wrong direction - can roll a boat over.
  5. I've used the G string app to measure rpm. The formula above is I think correct for a two cylinder four stroke engine (one bang per revolution). A four cylinder engine will (should!) do two bangs a revolution, so 1500 RPM is 50 Hz (divide by 30). My tacho has not worked for over 20 years.
  6. I think this may be the thread @Halsey mentioned If you want to do this trip before the winter, you need to get a move on. The Nene tends to close for stoppages between 1 November and Easter, and the risk of flooding is increasing now of course. Do please subscribe to the text alerts from the EA for the Nene, and for the Ouse (two sections, Earith to St Ives and St Ives to Bedford). It's worth having a phone chat with Paul the lock keeper at Salters Lode about the transit there. As noted above he knows what he is doing. As an aside, the water came over the top at Denver this week, on a very high tide....
  7. This doesn't sound a whole lot of fun .. https://marineindustrynews.co.uk/late-night-canal-boat-rescue-in-lytham-st-annes/
  8. Amps per hour is a possibility. 1 Amp per hour would mean for example, that you are using 1 Amp of current in the first hour, then you switch on some more lights, and use 2 for the next hour, then switch on some more (and your coffee maker) and use 3 during the next hour etc etc. A log scale would be better, so you could (say) double your current consumption every hour. The boat would get rather hot by the end of the day.....
  9. Fingers crossed, so far only a tin of Double Diamond. (That was a beer, for the younger members on here, though some might disagree).
  10. Indeed, you can get any periodic waveform you like (eg square) by adding harmonics at the right amplitudes. Fourier series/transform theory, which I have not quite forgotten.
  11. Thanks - interesting! I enjoy trying to break systems (in my mind, not physically of course). It gives me confidence on the boat to have two pairs of coolant temperature and oil pressure sensors, one to inform the gauges and one to set off the buzzer. I have been meaning for a while to add a test button to check the water buzzer circuit. The oil pressure buzzer circuit gets regularly tested, in normal operation.
  12. Is the other issue that it's not obvious (or at least not to me) what the "fail safe" mode should be? If the software detects a problem eg with the sensors, what it should do with the gate (in addition to calling a human to say there is a problem!)? At some times shutting the gate could cause problems too. As far as I can see there is no fixed weir here, just two radial gates? Stamp End was a bit hairy when we went through in the floods last year. Roughly 10 mins open (with a strong current upstream) and then 20 mins calm. After a bit of observation we worked out how to safely transit the Glory Hole, moor up in the City, and then approach the lock.
  13. Yes, I forgot to mention that shallow part to the skipper of the second boat. I was vaguely thinking about reversing upstream through the bridge, to give them a hand, but that would not have been straightforward !!
  14. You don't have a choice, on a Cambridge punt both ends are raised. Depending on your prejudices either: Cambridge punters are more skilled than Oxford punters, or They are less intelligent, as they can't choose between two options. The best way to fall in is for someone on a bridge to grab your pole as you go under a bridge (Clare and John's Kitchen are good for this), the punter hangs on to the pole, and then the person on the bridge lets go unless given a sufficiently good bribe. Here's another fun video to prove narrowboats can get along this stretch.
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