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Captain Pegg

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Captain Pegg last won the day on May 25 2019

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    Droitwich

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    Vulpes

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  1. Moment of inertia (I) is a physical property of the section, a measure of the dispersal of material around its centre of mass. You’re thinking of stiffness (EI/L) but in this case E and L are the same. So the answer to your question is the one with the highest I value and that’s the box. I see you’ve plumped for the angle, a completely illogical choice based on your original question and intention, however it’s not going to fail. JP
  2. The technically correct answer to the question is the box section. It has a moment of inertia over 4 times higher than the angle and hence has over four times the bending strength. Realistically though this isn’t an engineering problem - unless the whole thing is subject to a structural design - and the fixings will probably be the point of weakness in any case. JP
  3. It is basically correct and I’ve explained the phenomenon more than once on the forum. Well drained and deep homogenous soils promote the growth of strong healthy deep rooted trees which do aid the overall strength of the slope but by and large the conditions that promote healthy tree growth are also conducive to sound earthworks. If the slope has shallow soil overlying something relatively solid and impermeable - like rock or the clay core with which many embankments are constructed - then any trees that are allowed to grow will be shallow rooted and weak. The mechanis
  4. That’s because for every such report they have hundreds or thousands of potential failures their own processes have identified. I dare say they had identified the underlying issues at Middlewich anyway and it was simply in the mix of their scheduling of work. CRT will know very much more about their assets than you think. What they clearly don’t get right is understanding the risk profile in their maintenance backlog. It’s a lot harder to do that using foresight than it is when you have the hindsight afforded by reflecting on an empty canal. Even the best in the business are consta
  5. The technology isn’t necessarily transferable but it’s as much the mentality that is important. It’s the will to do the work to identify the root causes and adopt regimes that can detect them at the early onset stage. Railways have many critical risks, canals I’d argue have very few and a breach is very near the top of the list. Loss of water is possibly an indicator of a potential breach and there are simple explicit ways of measuring water loss in a pound. Ground penetrating radar rather than ultrasound is a potential appropriate technology but that would likely only be necessary
  6. General length of a days patrolling on the railway is about 6 miles. The core purpose is to inspect the track but it also includes a general fence to fence check. That isn’t though the primary means that is expected to identify an earthwork failure. You simply can’t do that sufficiently as part of a general inspection. If for example you were walking the towpath inspecting a canal how do you inspect the condition of an embankment on the offside? If you want to prevent breaches you need to explicitly inspect for the known precursors using someone properly qualified and experienced t
  7. Using a general visual inspection isn’t a robust method of identifying potential earthwork failures which is the generic cause of breaches. As others have identified the best a general visual inspection could achieve is to alert to the imminent likelihood of a breach. The kinds of features that cause earthwork failures require the inspector to be on and about the earthwork itself and therefore it is a specific detailed inspection. This is how CRT’s contemporaries manage their earthworks - and other critical assets - and it may also be CRT’s method. General visual inspections are fa
  8. This post cannot be displayed because it is in a forum which requires at least 10 posts to view.
  9. I’m terribly worried, not about the Foxes because I only asked a question about them. It’s the wives that I imagined that are the problem, I may be oppressing them. But at least it’s stopped me worrying that I’d misplaced an apostrophe in post #66 and was going to be called out for it.
  10. Let’s be clear that they haven’t broken any rules and aren’t boasting about it in the instance in question. I think some folk need to consider that the rules are generic for mass consumption and are aimed at an overall positive outcome for society as a whole. They don’t directly translate into clear and obvious outcomes for the detail of each and every persons’ situation. It therefore doesn’t follow that any single person that absolutely adheres to them poses less of a risk to society than someone who occasionally breaches them. Simply sticking to the rules verbatim, bu
  11. Is it that they’re misogynists? Never see their wives in the vlogs. Must be shut inside the boat cooking dinner. To be honest I think it’s probably more to do with the fact that the current situation is heaven sent for people who have an unhealthy interest with what other people are doing.
  12. I suspect you are correct on the first point. As for the outsource vs in-house debate I’ve spent 25 years working around that boundary with constant movement. Changes are usually enforced - by politicians or the appetite of the market to carry the incumbent risk - rather than made entirely by the will of the client. I also doubt that any canal administration has ever done all of its major civil engineering works in house, for not dis-similar reasons as to why I didn’t raise the turkey we’ll be eating on Friday in our own garden. I’m not sure why people get so excited ab
  13. We really shouldn’t want to see that, it will make for a very boring read. I don’t think there’s much of a story here.
  14. Of all the reasons one might be attracted to France. That little story provides a great insight to the mechanically minded male. It is something of a beast, apparently too strong for its own body. The French were perhaps wise enough to note that all their wheels were connected by axles. I’ll bet it had some interesting arguments with sharp curves.
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