Monday 23 October 2017

Blacking

Every four years Patience has her bottom blacked with a couple of coats of bitumen. This is essential to keep her hull in good shape, preventing pitting of the metal.
Though this can be a DIY job we've found that the cost of landing her is greater than the cost of having someone paint her and it is a messy job, so we pay a bit to have someone do it for us.
This is the fourth time we've had Patience in dry dock and it's interesting to compare the techniques as well as simply staring at the parts of her that aren't usually visible.
First time was for her very first inspection, a survey in dry dock when we were considering the purchase. Fascinating to see her bottom for the first time!
Second time was for blacking at Earith. A broken crane caused delays (she was craned out of the water in a sling) and perhaps the blacking was put on in a bit of a rush, but no harm done. And we did have the chance to see one of the grey seals that have made their home in the marina.
Third time was in the comfort of the workshop at Oundle, where we were moored.  We had an Oundle man apply the blacking then we paid for an extra few days under cover while we painted her up in other areas more easily reached when she was out of the water.

And now the time has come again, and we have brought Patience to the workshop at North Kilworth Wharf, where she will be cared for this week. This is the tractor that towed her out of the water into the slipway. First you float the boat over a cradle that is attached to a long towing pole. Then the tractor tows the cradle out of the water, with the boat resting on top.
Now we have our first view for four years of the condition of the hull. Surprisingly there are large numbers of fresh water mussels clinging to her.
Patience is here on the cradle which in turn rests on wheels on rails.


 In addition to blacking they will weld on some sacrificial anodes. These are blocks of magnesium which are bolted to the hull and corrode faster than, or in place of, the metal of the hull and prop, thereby giving protection. It is important to check the anodes, as they prevent electrolytic corrosion of the steel plate and the bronze stern gear. And we don't want the steel hull to wither away ....

And so we leave Patience for a few days while the hard working guys at North Kilworth dry her off, paint on the bitumen, weld new anodes and attend to her every need. More details next week.
And by the way, don't confuse the well established wharf at North Kilworth with the yet unfinished new marina. A lot of work going on there and it will be a fine sight, but we prefer the well established wharf.



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