Showing posts with label surveying. Show all posts
Showing posts with label surveying. Show all posts

Thursday, 16 October 2014

Canal Boat on Salt Water

Dave and Natalie bought this old English narrow boat on a French canal ‘as seen’ for a remarkably
good price. It had languished on the water for six years, used only occasionally as a weekend cottage at the beautiful Breton village of Evran. Dave took a risk but not a huge one. He’s a skilled seaman and has already restored a Channel Islands 22 motor vessel – bringing her back to, and then beyond, her initial spec. Paul, his good friend has done similar restoration jobs on vintage cars.


Having bought the vessel they had the Volvo Penta engine running within half a day and then they discovered that the value of the wood-burning stove installed aboard almost covered the price paid for the entire vessel. In effect Dave bought a fully functioning eleven meter steel vessel for the price of a new stove. What’s more, the range of gear and equipment on board was pretty comprehensive – even down to cutlery, crockery and the all important corkscrew and bottle opener.











The main concern now was to make her secure for the winter and to ensure that the hull, after six
uninterrupted years afloat, remains sound. It isn’t easy to lift an eleven meter canal boat, she’s heavy and has to be supported in the right places along her hull. Fortunately the guys at Estuaire Marine at Plouer Sur Rance have the gear so all that was required was to get the boat there from her mooring at Evran on the canal. The trip involved several miles of canal travel through four locks and then through a much larger lock out of the fresh water canal into the salt water of the estuary.

They planned to do the trip in two phases – first from Evran to the beautiful medieval town of Dinan, then the following day, from Dinan out of the canal locking into the estuary for the five or so mile trip down to Plouer. We had no concerns for waves on the estuary, neither, given our 0.5meter draft, did we fear running aground. Our main concerns were whether the engine would be powerful enough to counter the tide and the potential for leeway if a cross-wind caught the boat in a tight spot. The first issues was easily dealt with – lock into the estuary just after high water when the ebb would assist the journey. The second issue would be one of choosing decent weather.

Initially the trip down the estuary was planned for Wednesday but given a forecast of 30 knot winds, the timing was brought forward to Tuesday when the wind would be less strong and from a favorable direction for most of the time.

Davy and Paul brought the boat from Dinan and I hopped aboard at the sea lock. All was well with gentle wind and tide, even the sun came out briefly and the entire trip was without incident save for a moment of minor concern when we crossed the wake of the passenger steamer coming up-channel as we were turning to enter Plouer Marina. Dave turned into the bow wave and we took the waves effortlessly, except for the fact that the automatic bilge-pump suddenly kicked into life and started pumping gallons of water out of her. Where had the water come from? The bilges had been dry when Davy checked them at Evran. I went forward to see if a wave had splashed over the foredeck but it was dry. Then, within a couple of minutes, to our relief, the pump stopped. The only explanation is that the motion of the boat in the ferry’s wake must have been enough to open one or two limber holes in the bilges enabling trapped water in fairly obscure places to run aft. The water was not salty so at least we weren't leaking.

Thursday morning, top of the tide, the boat was run onto a waiting trailer on the slipway. Estuaire Marine hauler her out and hosed her down. The hull was clean and sound and the anodes were as new. So now we’re waiting for a survey report on the hull but, given our initial findings, I don’t think Dave has much to worry about.














Seaward

Saturday, 26 October 2013

Channel Islands 22


There are times when renovating an old boat can be a lonely business. Too few take on the challenge and
too few succeed. So to cheer myself up I spent some time with Davy and Natalie on their boat recently.

They live on the Island of Jersey but frequently visit my home port in France to stock up on wine, calvados etc – and also to gain a respite from the hustle of an Island only 45 square miles (at high tide) with 90,000+ inhabitants.

A few years ago Davy wanted to purchase a boat and spent a good deal of time looking at vessels he simply couldn't afford. A Channel Islands 22 would be ideal. Designed by Alan Buchannan specifically for these waters, she is a safe semi-displacement motor vessel, capable of some speed, with enough cabin and cockpit accommodation to make two people very comfortable. With, her cockpit tent she becomes almost luxurious.

Davy visited several but even the oldest were beyond his price – until he was invited to see one that had been for sale for several years. Problem with her, according to the broker, was that she was ridiculously slow.  Normally a CI22 will lift onto a plane at 7 knots but no-one had been able to get her to that speed so there had to be something seriously wrong.

Davy looked her over. She was dirty but sound. He also though he had discovered why she wouldn't lift and fly so he took a chance and made a very low offer – which was accepted.

First thing Davy did was to cut away two bilge keels that had been molded onto her hull by a previous owner. They were not part of the original design and Davy estimated that the drag they caused was the reason for the poor performance. He was right. Without those additional keels she flew!

Similar vessels
Next job was to attend to her cosmetically. Davy estimates that he spent 1000 hours sanding, polishing,
painting and varnishing. Natalie also contributed most of her out- of- work hours to the project. The boat is now in better condition that when she was new. There are hot and cold domestic water systems. The heads is now a ‘wet-room’ and the cabin is lined in thin exterior ply, routed, filled and varnished to look like individual planks. There is a 24 volt circuits for use in port where hook-ups are available and a 12Volt system for other times. Floors are carpeted and every window has an individual blind (bought from Mothercare rather than expensive Chandleries). At sea there is stowage for two folding bicycles and on the river, they sit on the cabin top ready for use. This isn't sailing as I know it – this is luxury.

Davy and Nat married last year and spent their honeymoon cruising Jersey, Guernsey, Sark and Herm islands. Initially they had a slight problem getting up to speed. Some guests had tied lines of cans to the stern of the boat (as is the custom in the UK with the bride and groom’s car ) – never seen it done on a boat before though).


Seaward



Monday, 1 October 2012

Westerly Nomad (2)


Rig and Rudder



Well there seems to be quite a bit of support for the idea of purchasing a Westerly Nomad and this one seems to tick a significant number of boxes (although a few boxes remain unticked and there are still a few unanswered questions) Maybe someone can offer suggestions.

Firstly, the boat is ‘sound’ to the best of my knowledge. I undertook a boat surveying course last year organised by the International Institute of Marine Surveyors and seriously considered taking it up as a part-time retirement activity. Unfortunately, the cost of professional indemnity insurance for a rookie surveyor is such that I would have had to work full time to cover the fees, and that would have put me back to the 9-5 routine I was trying to avoid – so it didn’t happen. I do feel qualified to survey a small boat however, so I’m satisfied she is sound and, if I get it wrong, well, I can blame the surveyor but I can’t sue him.

She certainly fits the bill for shallow draft and as a triple keeled vessel, she’ll take the ground without falling over – so she’s good for estuary and canal. Previous Nomad owners have crossed the Atlantic and everyone tells me she is a good sea boat although she is slow. Cabin accommodation is likened to that of a 26 or 27footer, so she’ll be comfortable for two.

The Nomad is essentially a modified Westerly 22 and the Westerly 22 was Günter rigged – so maybe (and this needs further research) just maybe I could rig this Nomad as a Günter. The question is whether in developing the Nomad  from the 22, the designer moved the chain plates for the shrouds - I don’t know. Why does this matter?  Well, there can be no backstays with a Gunter rig so the responsibility for stopping the mast falling forward rests with the shrouds, attaching them as far aft as possible. The Nomad was always produced as a Bermudan sloop with backstays – so did Rayner move the shroud fitments forward when he added the chain plates on the transom? Interestingly enough, the Nomad has twin forestays, one of which sits inboard and attaches to the mast at two thirds the height of the mast – pretty much where the forestay on a Günter rigged vessel would have been. This seems a little like over-egging the pudding (as we say in Yorkshire) So, did Rayner simply add a mast headed forestay and backstays to the existing Gunter rig arrangement to accommodate Bermudan, or did he alter the location of the lateral stays as well? If the answer is the former, then I could perhaps consider conversion to Gunter. Either way this isn’t top of my list of priorities – it would be nice to do – if and when all the other issues have been dealt with.

At the moment I am more concerned with another modification which has been made to this particular Nomad. The rudder has been changed and moved to the transom and the space saved in the cockpit has been used to create an outboard well. Now this is both exciting and worrying. The new rudder looks strong enough and her fittings seem robust. The outboard well seems to be well-made and strong. If this modification works it frees up inboard engine space and makes for a cheaper and easier to maintain power source. The rudder however, is in a new location and is more exposed. Allain, a professional boat builder and sailor suggests that the new location for the rudder should improve performance over the original design and that if I am worried I can protect it and strengthen it by fitting an iron bar between from the bottom of the rudder and the bottom of the keel. A job, I might consider after a season’s use when I have got the measure of how she performs. 

With these modifications there is no question of bringing the boat back to her 'factory setting' so I certainly won't be 'restoring' a Westerly Nomad, instead I will be 'renewing and updating' a modified version. This isn't a problem for me, in that I always wanted to end up with something more comfortable that the rather austere vessels typical of 1960's GRP. 

So, you can guess my interest in this Nomad is more than casual. I know this boat will be in my price range (because they all are) but a price has to be negotiated and my concern is to achieve a fair settlement neither feeling ripped-off nor feeling that I have ripped anyone else off. I’m into Simple Sailing and Low Cost Cruising but I don’t want to achieve this at anyone else’s expense (unless they are a banker of course – they seem to be able to look after themselves well enough!). Now, these boats are old and so relatively cheap in the UK but rare in France so lets see what happens.


Seaward


Friday, 1 June 2012

Lloyds Standards


A story in the boating press and another in my local newspaper caught my eye recently.  One concerned someone who had purchased a boat on ebay and decided to take a couple of day’s vacation to sail her from the seller's boatyard to his own moorings a few hundred miles away along the south coast of Britain. Engine heating troubles delayed the start of the voyage, batteries failed to hold their charge and in the end the trip became a nonstop 36 hour marathon to meet work schedules, with new problems encountered almost hourly. OK, the boat was inexpensive but it seems to me the skipper took a huge risk in buying a boat unseen and then assuming her to be faultless. A less experienced skipper could easily have become a lifeboat or coastguard statistic.

The other story relates to someone more locally, who sailed his internet bought boat for approximately 20 minutes before significant bits of her fell apart (actually, the keel dropped off!). She drifted onto the rocks and became a ‘total loss’ on the next tide. The boat had only cost him something in the region of £2,000 but the embarrassment was intense.

The two stories serve to reinforce my belief that you have to see, smell and touch the boat yourself before you sign anything, and then buy-in a professional surveyor only when you yourself are convinced that she is sound.

One comment I found particularly interesting in the press report though, was a statement of surprise by one of the unlucky new owners.
‘She came with a Lloyds Certificate, surely that should have meant something, you know, that she was a good boat’.
So that set me thinking about certificates such as these. What do they tell you?

OK, here’s what I discovered. 

Lloyd's is a UK organisation, one of several on the international scene, known as ‘Classification Societies’. As well as Lloyds there is Det Norske Veritas, and the American Bureau of Shipping. Their role is often misunderstood.

Each society sets the minimum standards that it requires for a vessel to be included on their lists. The standards however only apply to certain aspects of a vessel. Most major classifications have standards for yachts and small craft but it is not compulsory for a builder to comply with any or all of the standards.
 
Even when builders choose to comply, with published standards of construction for example, it does not mean that every aspect of the boat has been considered and evaluated by the classification society. The only way to know what the society has approved is to refer to the standards published by the society for that particular type of boat at the time of construction.

So, Lloyds, for example may publish certain standards that they believe are important for the construction of a GRP boat hull. The standards refer to GRP quality, thickness, type of mat and resin used, the environment, temperature and humidity of the boatshed etc. Some builders may go the whole way and invite inspection to verify the attention to such details. Others may simply state that they themselves built the vessel in accordance with published standards.

But then, standards can change over time as more is understood of the building material. It’s a bit like health and safety regulations, they change and become stricter as more silly people do silly things (or as more governments and organisations feel they have to control our lives for our own good). So, your Lloyds construction certificate at best only confirms that the boat was built according to the best knowledge available at the time. A well looked-after vessel may still be in good condition but an old certificate issued for a craft which has been neglected and misused for twenty years is hardly likely to be sound simply because the builder claims she was built to Lloyds standards.
 
So, for me this is all interesting but pretty academic. For my money I will have to asume that the vessel I buy will not be in a seaworthy condition on purchase. My task will be to develop 'Seaward Standards' and bring her up to expectation. In some strange way that is a liberating thought. It means that my prime concern should be the shell of the boat, her mast and sails. The rest will have to be rebuilt or refitted and if I discover anything else actually works - well that's a bonus isn't it?







Seaward

Tuesday, 1 May 2012

Osmosis in Sailing Boats

Have been reading up more about osmosis in GRP boats. I need to be able to diagnose it if I am to avoid buying a boat that has it. The more I read the more reassured I am.


Blisters? yes one or two but is it Osmosis?
Essentially, (let’s not get too scientific here), Osmosis is like a piece of string with one end in a saucer of water, the string acts as a wick and although most of the string is out of the water, it still gets wet along its whole length. As far as GRP boats are concerned the standard gelcoat is not 100% waterproof, and unless a great deal of care and attention goes into the manufacture of the hull, there may be hollows (voids) within the layup. So, water can get in. But that’s not all. There are certain chemicals binding agents and release agents used in GRP hull manufacture which can also end up within the layup, filling some of these voids. The result is that if you have fluids either side of a membrane, i.e. water on one side of a gelcoat, and other less dense fluids on the other side, there is a tendency for the denser water to pass through the membrane and mix with the lighter, less dense fluid on the other side. Over time, the water inside the hull reacts with the chemicals and causes blisters. If the blisters break, more water is admitted into the GRP layup, causing more blisters, admitting more water … well you get the picture.

So, over time GRP can soak up a considerable amount of water making the hull heavier and weaker. The cure, depending on how badly the boat is affected, can be to peal off the gelcoat, dry the core and then reapply a new gelcoat. A small repair might be within the skill set of an amateur. A bigger job might require professional expertise. A preventative measure might be to coat the existing underwater aspects of the hull with a more water resistant material such as epoxy.

Some GRP boats never suffer from Osmosis
The good news seems to be that despite the panic which ensued when it was realised that GRP was not the ‘no-maintenance’ material it was originally thought to be, there have been few (if any) reports of boats coming to grief because of it.

The other good news is that, although it is wise to inspect any blistering on a GRP boat hull, not all blisters are caused by Osmosis and some blistering is relatively easy to cure. So how to tell the difference?

Osmotic Blistering

Blisters caused by Osmosis will be found around or under the waterline. They may be small pin pricks or large swellings as big as the palm of your hand. It would be unusual to find osmotic blisters on a boat until she had been immersed for several seasons. Puncture an osmotic blister and there will be fluid behind it. Fluid in itself is cause enough for concern but if the fluid has a pungent vinegary smell, the indications are towards osmosis. The smell comes from acetic acid, due to the hydrolysation of the emulsion used as a binding agent in the manufacture of chopped strand mat.

You can confirm your diagnosis by using PH paper. A pH value of less than 7 indicates acid. Readings of between 5.5 and 3.0 are typical when water and binding emulsion have joined forces. This would be indication enough to call in the experts or consider whether you really want to pursue this purchase.


Non Osmotic Blistering

This can be found in the same areas as osmotic blisters, in clusters along or under the waterline. They tend to be small pin pricks – rarely large. They tend also to be much tougher than osmosis blisters. They can be very hard and difficult to break. Most importantly though, when you do break into them they are dry and there is no smell.

They can occur for two reasons, either:

air was trapped between the gelcoat and the inner mat during manufacture – and the voids have enlarged due to temperature changes;

there is a fault in the gelcoat due to the absorption of  water into the pigment or extenders used in the gelcoat when it was manufactured.

Unlike Osmosis, this problem is more likely to surface within a few months of launching. The cure? Strip off the antifouling, degrease and sand the gelcoat, fill the holes with epoxy and then apply an epoxy paint and re-antifoul. A serious job – but not a disaster. – something a DIYer could probably cope with


Seaward