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Post by Mr Stabby on Apr 2, 2017 12:30:38 GMT
My boy just asked what would happen if, descending a lock, you tied the centreline too tightly so that it started bearing the weight of the boat, with several feet of drop still to go. I said I thought the rope would snap before the boat was lifted clear of the water, would this be correct?
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Post by Deleted on Apr 2, 2017 12:47:34 GMT
My boy just asked what would happen if, descending a lock, you tied the centreline too tightly so that it started bearing the weight of the boat, with several feet of drop still to go. I said I thought the rope would snap before the boat was lifted clear of the water, would this be correct? Don't bet on it. Depends on how good the fixing it's attached to is. news.bbc.co.uk/1/hi/england/london/4276081.stmI've seen aa posh inspection launch type narrowboat nearly sunk ascending Yarwell lock with the centre line made fast to a bollard. The idiot in charge nearly lost his fingers trying to pry it loose. My Sharp knife saved the day. |
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Post by Deleted on Apr 2, 2017 12:48:09 GMT
Yes (usually)
However if it is fixed to a badly fitted ring in the roof it could be the weld around the ring which failed in which case the ring would become a projectile and the rope a catapult.
It has happened and caused injury.
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Post by Deleted on Apr 2, 2017 12:52:10 GMT
Yes (usually) However if it is fixed to a badly fitted ring in the roof it could be the weld around the ring which failed in which case the ring would become a projectile and the rope a catapult. It has happened and caused injury. Exactly. The only centreline I'd trust is one I would have fitted. I'm no fan of centreline ropes anyway. |
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Post by Deleted on Apr 2, 2017 12:59:32 GMT
My boy just asked what would happen if, descending a lock, you tied the centreline too tightly so that it started bearing the weight of the boat, with several feet of drop still to go. I said I thought the rope would snap before the boat was lifted clear of the water, would this be correct? Don't bet on it. Depends on how good the fixing it's attached to is. news.bbc.co.uk/1/hi/england/london/4276081.stmI've seen aa posh inspection launch type narrowboat nearly sunk ascending Yarwell lock with the centre line made fast to a bollard. The idiot in charge nearly lost his fingers trying to pry it loose. My Sharp knife saved the day. Was it going down or up? Sometimes tying the centre line too tight going up is even more risky as it can tip the boat roght over. |
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Post by Deleted on Apr 2, 2017 13:03:14 GMT
Yes (usually) However if it is fixed to a badly fitted ring in the roof it could be the weld around the ring which failed in which case the ring would become a projectile and the rope a catapult. It has happened and caused injury. Exactly. The only centreline I'd trust is one I would have fitted. I'm no fan of centreline ropes anyway. It happened to a bloke who used to be on canalworld. He was slowing the boat as it entered a lock by centre rope around a bollard. Roof ring broke (welded U shaped bit of steel has a very small weld area) the ring stayed on the rope and as the rope was stretched it slung the ring at him. Hit him in the shoulder. Imagine that in your face. Horrible. |
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Post by Deleted on Apr 2, 2017 13:31:42 GMT
Don't bet on it. Depends on how good the fixing it's attached to is. news.bbc.co.uk/1/hi/england/london/4276081.stmI've seen aa posh inspection launch type narrowboat nearly sunk ascending Yarwell lock with the centre line made fast to a bollard. The idiot in charge nearly lost his fingers trying to pry it loose. My Sharp knife saved the day. Was it going down or up? Sometimes tying the centre line too tight going up is even more risky as it can tip the boat roght over. Ascending = up  As you say it came close to rolling over. The last time we saw it they had wiped out the ornate wooden and leaded glass cratch - they must have had an expensive time 'doing the Great Ouse'! |
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Post by Deleted on Apr 2, 2017 13:40:48 GMT
Exactly. The only centreline I'd trust is one I would have fitted. I'm no fan of centreline ropes anyway. It happened to a bloke who used to be on canalworld. He was slowing the boat as it entered a lock by centre rope around a bollard. Roof ring broke (welded U shaped bit of steel has a very small weld area) the ring stayed on the rope and as the rope was stretched it slung the ring at him. Hit him in the shoulder. Imagine that in your face. Horrible. Doesn't bear thinking about. i remember reading the MAIB report for that accident in the BBC link, it was a fair sized lump of steel that hit that poor woman. |
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Post by JohnV on Apr 2, 2017 13:45:10 GMT
I usually only use the centre line on Shapfell ...... only sensible point with a 25 foot boat single handing. The line I use has about 2.5 to 3 ton breaking strain which is close to the weight of the boat  ................ however I am not sure that the cabin top would still be attached to the hull with that strain on it  |
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Post by naughtyfox on Apr 2, 2017 14:00:49 GMT
With locks you should be careful. A couple of clicks of the ratchet mechanism and keep an eye on what's happening. Why would you tie a boat up by a centre line? Perhaps wrap it very loosely round a bollard so it doesn't 'trail' and fall into the lock.
If you are in a hurry, go to an airport and get a rental car and zoom off up the M6 / M62 (not the M1 - that's always got roadworks going on somewhere).
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Post by JohnV on Apr 2, 2017 14:36:55 GMT
With locks you should be careful. A couple of clicks of the ratchet mechanism and keep an eye on what's happening. Why would you tie a boat up by a centre line? Perhaps wrap it very loosely round a bollard so it doesn't 'trail' and fall into the lock. If you are in a hurry, go to an airport and get a rental car and zoom off up the M6 / M62 (not the M1 - that's always got roadworks going on somewhere). why would you tie a boat up with any line while working a lock ? (I said "use"! ) Often I don't take even a full turn round a bollard but just a half turn and bring the end of the painter to near the paddle I'm using (If it's a wide lock and I'm single handing I just use one set of paddles [unless they're very leaky] I'm very lazy ) that way I can grab it quickly to get it under control if needed. |
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Post by Mr Stabby on Apr 2, 2017 14:41:25 GMT
Yes, I don't "tie up" as such, just put a loop in it which allows me to feed it out as the boat descends, my centre line is long enough to be able to hold it while I operate the paddle, it was a theoretical question he asked me.
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Post by Deleted on Apr 2, 2017 16:38:53 GMT
'Theoretical question'...... I thought he looked more intelligent than his Dad  Rog |
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Post by Deleted on Apr 2, 2017 17:02:24 GMT
My boy just asked what would happen if, descending a lock, you tied the centreline too tightly so that it started bearing the weight of the boat, with several feet of drop still to go. I said I thought the rope would snap before the boat was lifted clear of the water, would this be correct? You could die....... (just sayin) 😂😂 |
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Post by Deleted on Apr 2, 2017 17:09:53 GMT
With locks you should be careful. A couple of clicks of the ratchet mechanism and keep an eye on what's happening. Why would you tie a boat up by a centre line? Perhaps wrap it very loosely round a bollard so it doesn't 'trail' and fall into the lock. If you are in a hurry, go to an airport and get a rental car and zoom off up the M6 / M62 (not the M1 - that's always got roadworks going on somewhere). why would you tie a boat up with any line while working a lock ?  (I said "use"!  ) Often I don't take even a full turn round a bollard but just a half turn and bring the end of the painter to near the paddle I'm using  (If it's a wide lock and I'm single handing I just use one set of paddles [unless they're very leaky]  I'm very lazy )  that way I can grab it quickly to get it under control if needed. Painter? I thought your splitter was a centre cockpit cruiser not a dinghy ! |
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................ however I am not sure that the cabin top would still be attached to the hull with that strain on it 
