|
Post by TonyDunkley on Dec 30, 2018 0:19:49 GMT
A question for Mr Snot-for-Brains; will you be replying to this query about why you have introduced the Port of London Authority into this topic, . . or is there some reason why you would rather not ? You really want people to believe you are a twat don't you. No, . . I'm looking for an answer as to why Mr S-f-B's felt it necessary to announce yesterday that the Port of London Authority hadn't taken - quote - ''legal action'' against him, and why he would have thought that they had any reason to do so. It's a perfectly reasonable question arising from the fact that a minor but potentially quite dangerous incident on the Thames tideway last August is obviously still haunting him over 4 months later. Could it be that he's developed a guilty conscience over his continuing self-centred and stupid refusal to co-operate with the PLA in working toward ensuring that others aren't exposed to the same needless risk as he was whilst the works in the area of the Blackfriars Bridges are still in progress ?
|
|
|
Post by freewind on Dec 30, 2018 0:47:15 GMT
There is a baffle plate at the lower end of the weed hatch,so I can't see that turbulence will be a problem. Checking the strainer for weed will involve lifting the weed hatch lid. On my boat this is quite accessible. Why not just fit the strainer inboard rather than below the weed hatch top. The obvious problem with this is it means you would have to have a suitably flexible connection or perhaps some sort of quick release arrangement if you wish to use the weed hatch for its designed purpose which normally involves complete removal. I personally prefer to clear the prop with a sharpened boat hook but there are times when access to the weed hatch is necessary. My comment about turbulence was related to the fact that the jabsco (type) pump is a positive displacement type. If the weed hatch baffle plate is a close fit to the Uxter plate I think some problems could arise with replacing the water drawn out of the weedhatch cavity itself. It could work a bit like a mud box but it would depend on the baffle plate and the gap around it. Fitting the strainer inboard is a good suggestion. But first,as you pointed out, I need to know if the water drawn out will be replaced quickly enough.So I will try it out with a temporary arrangement and if ok,make a decent job of it.
|
|
|
Post by JohnV on Dec 30, 2018 11:09:21 GMT
Why not just fit the strainer inboard rather than below the weed hatch top. The obvious problem with this is it means you would have to have a suitably flexible connection or perhaps some sort of quick release arrangement if you wish to use the weed hatch for its designed purpose which normally involves complete removal. I personally prefer to clear the prop with a sharpened boat hook but there are times when access to the weed hatch is necessary. My comment about turbulence was related to the fact that the jabsco (type) pump is a positive displacement type. If the weed hatch baffle plate is a close fit to the Uxter plate I think some problems could arise with replacing the water drawn out of the weedhatch cavity itself. It could work a bit like a mud box but it would depend on the baffle plate and the gap around it. Fitting the strainer inboard is a good suggestion. But first,as you pointed out, I need to know if the water drawn out will be replaced quickly enough.So I will try it out with a temporary arrangement and if ok,make a decent job of it. sounds like a plan !!!
|
|
|
Post by freewind on Dec 30, 2018 15:26:29 GMT
No, not at all, . . the only reason I didn't reply earlier is because I was busy with something else. I know what you mean about getting old, . . I can still get down and into awkward spaces to work on things, but it's not so easy these days getting back out again. Regardless of the layout of your boat, there will be things that can be done, or altered, to alleviate the problems associated with cooling water stoppages. The builders and outfitters of canal pleasure craft have always stuck to smallcraft river and coastal practice when fitting direct or heat exchanger cooled engines, and this simply doesn't work anything like as well as the intake and straining systems that were standard on inland commercials from motor narrowboats working on the small canals to barges and tugs on the rivers and estuaries. As you're not having your boat out of the water until the Spring, there is plenty of time for you consider all the options in the meantime. Positioning and total opening area of intakes is everything, and well designed, and located, intakes on canal craft can be arranged so that most of the muck causing the stoppages accumulates over the intake and externally to the hull plating, and can be cleared by either a short burst astern or by wielding a mop or stiff brush over the side in the right spot. One potential source of cooling water which is generally overlooked on today's canal pleasure craft is the weed hatch, . . it's well away from any mud/sand/silt that the boat moves through or over, and is constantly washed clean externally by propeller action. Been down to the boat today to look into your suggestion of using the weed hatch as a cooling water intake. After giving the weed hatch a severe dose of looking at,I am sorry to report that I don't think it will work for several reasons. There is a lip on the bottom of the weed hatch that the baffle plate only just fits into.The baffle plate is joined to the lid with two square section steel tubes welded on.When replacing the assembly it needs to be jiggled about a bit to seat properly,so there isn't much clearance. More worryingly,there is only two inches of water in the weed hatch and that is with my weight on the counter and a virtually full fuel tank. At tickover the cooling water exit usually squirts continuously three or four inches,and about six inches at cruising revs. ( it used to squirt further before I fitted a restrictor to the bypass to give the engine water a little more pressure) So the Jabsco pump does require a fair amount of water. You have obviously given my queries some thought and for this I thank you,your suggestion would probably work on a boat with a bigger weed hatch with a smaller baffle plate,and a deeper draught,but not on mine. I have lived with the system on my boat for two years,so I will live with it for a bit longer. Happy New Year, Tony. .
|
|