This is the first posting in my Blog for the 2013 group, I decided to continue posting during 2013 rather than create a new blog because there is information that is the same website links etc, do check the dates when you are reading the posts and make sure any suggestions and instructions are relevant to 2013
The purpose of the blog is to provide you with information which you can bring to class, if you already have a reasonable understanding of methods of repair, maintenance issues and boat transportation you will find that case studies make more sense when you discuss them in class, they make up your portfolio.
We need to have a forum which can be used for me to provide feedback the blog is not ideal, in the past google docs have been used we could continue with that which works well, you may wish to communicate as a group using google plus
The first problem that we have to solve is regarding what is known as Osmosis, what is it in the marine Repair and Maintenance environment?
Osmosis
This is a website with information, I have also written a short account about osmosis repair which is on this blog in the Feb 2012 post
- 26th Feb 2013 In our session yesterday we decided that the word count for your Log Book would be between 1500 and 2500 words
Osmosis repair has come a long way in the last 10 years so make sure you are reading current material
Case study 2 11/3/13
The groups were established for study on the 2nd case "Repair on a Teak deck", there is a variety of website information available which can help you with this case. The case should be approached in a way where your group can systematically complete the neccisary research with feedback from me
In order to resolve this case and be specific about the method of repair you must establish the detailed construction method I suggest this should be done in class discussion, there will be time set aside for this at the beginning of our session on the 18th March
We decided on the construction of the deck, 2 layers of 6mm plywood over a clear varnished deck frame, the plywood on the underside was painted between the deck framing and on the top side had 10 mm teak decking. The gunwale detail consisted of a painted covering board with a toe rail attached. Although the soft ply is described as extensive it does not travel under the covering board. Typical deck framing of this era is described in the Gougeon Bros book
I don't recall any discussion as yet on the fastening of the teak to the plywood and deck frame, if you think we need to discuss this ask me next week
Case study 3 Leaking Windows
Website which has relevant informationwindow sealing information
All of the windows are Tinted 6mm Toughened glass, the window frames are anodized aluminium they have been attached to the coamings with SS screws at 100mm spacing the windows in the rebates have wooden beading's which finish flush on the outside of the cabin side coamings. The coaming itself is finished in a white polyurethane topcoat.
The aluminium frame holding the main windows is rebated and sits into a cut out in the cabin side coaming
There are other important areas of study in boat repair which we can discuss these are, Insurance claims on damage and theft, how does that work. What are the various types of repair have a think about this and be prepared to put your ideas forward in group discussion
The Easter Break takes week 6 meaning that the Field Trip to Gulf Harbour will now take place on week 7, (8/4/13) and the second field trip will take place on week 10, (13/5/13) . Case 5 will be studied on week 9 over just the one week
Field Trip and Case 4
The purpose of the field trips is to put reality into the discussions we have had, you were able to view first hand the Trave-lift (in operation) support systems, you may have noticed the blocks that were used to hold the cradles up so that the boats undergoing an osmosis repair are at a workable height. I do notice that cradles in the past have been both arm and bilge style however looking around the yard I can see that the arm cradles are being fazed out, what would be the reason for that?
I think you can consider the wooden repair that is typical of the type of work a repair yard will undertake, it is skilled work that requires a very thorough knowledge of all types of construction to plan a successful repair. That boat could just as easily have been a composite construction as was shown by the other example in the yard, if that were the case the repair process would be substantially different
Next week we will discuss Case 4 please read the case through, as we only have one day to study this we need to prepare. The first thing you are being asked to do is move a 15 metre yacht into the factory without the aid of the Travel-lift
Followed by a description of the repair process for the particular case
Survey laminate structures
Fibreglass laminate repair
You will work in groups to prepare this case, feedback will be in class, groups will present their ideas in three separate headings
Move the vessel and prepare to Repair
The Repair
The resurfacing
Case 5
Is the study of corrosion in two parts, the first part is regarding the clients question about connecting the underwater components on the 15 metre power boat and the 2nd part is to explain if there is a problem of corrosion when metals contact wood
The following are questions that you could consider when you study this case. What is the owner wanting to achieve by connecting underwater components?Is it a factor for consideration that the vessel is a carvel planked wooden hull?
There are pictures on the post 6 March 2012 that are examples of timber deterioration which has taken place in the proximity of metal, why?
The May 22nd 2012 post has information relevant to this case
20 5 13 .Today we study the stewart 34 case. This is a more complex situation than it might appear.The Stewart 34 is a class of yacht which was designed by a NZ designer Bob Stewart who it could be said was ahead of his time in that he drew boats that were light, had a low CG and a relatively shallow canoe body. and sailed in a similar manner to a dinghy. The Stewart 34 became a popular cruiser/ racer, the first boat of the design was launched in the late 1950's and the class is still popular today with boats being built in either wood or fibre-glass. The wooden boats are constructed using a diagonal planking of 3 skins over stringers with a protective sheathing of glass cloth.
In the early 1970's female moulds for both hull and decks were constructed and from that time most of the new boats were fibre-glass laminated from those female moulds and this is the construction of the boat we will be working on
The class still has a very active association, they enjoy regular racing amongst the fleet a large amount of which is match racing. This type of racing is great fun however because of the close proximity and small tight corners there is inevitably some contact and quite a bit of wear to the deck and cockpit area meaning that some bots look as if they aren't looked after. There comes a time when the hull and decks become damaged to the point that touch ups polishing etc is a rather wasted exercise and this is what this case is all about
Aboat painting guide (Interlux)
When should the decision be made to repaint the hull and decks? what is the cost likely to be. how would the painting be done what paint will be used and where will the work be carried out? Theses are the questions that we need to answer for the client. We will spend some time in class working through the options trying to give you a clear picture of the situation so that you can resolve the case
27 May 2013
The study will be on keel repair, Case study 8. The boat is described as a 25yr old FRP 12 metre production boat. What we are interested in for our case is the keel attachment. As with all boats there are different ways to attach the keel however we have been told in the case description that the keel butts to a stub, that means that the keel we must assume is a cast lead keel. The bolts could have been cast into the keel or bored through to a pocket in the lead casting with a nut attached. either way if the keel is removed the bolts will remain held solidly in place by the lead casting.We must think about how it will be removed, the lead is very heavy and not an easy shape to support when it is free from the boat
Can you describe the stub?
Is the matrix of polyester resin and CSM the cause of the joint failure or could it be that the keel bolts have not been tightened since the boat was launched, or what other reasons could there be for the joint to be broken.
We will discuss the process to re-seal a keel in class in the meantime you should gather as much information as possible on re-sealing a keel
tThe images show keels that are attached to a stub and both show a keel joint which is broken. The subject of keel attachment and associated maintenance information of a reliable source is not easy to find. As a group we will cover this.
The process to reseal is as follows
- Level the hull in the cradle
- Support the keel
- Remove nuts, bore down around keel bolts
- Position the lifting device
- Break the keel joint
- Lift the hull from the keel
- Move the hull away and support separately
- clean and dry the joint both keel and stub surfaces
- Remove the old joint compound
- Apply bedding compound and lift the hull back on to the keel
- Level the hull athwart ships, take the weight on the fore and aft bolts
- Pour resin around the bolts
- Put nuts and washers back in place and touch up the antifouling
Case 7; To Ship a 10 metre powerboat to Australia
This is the problem to resolve in the last case which we will study on the 10th June.Yachting NZ is the body that administers yachting in NZ. Amongst their responsibilities is the inspection of yachts and powerboats heading offshore.
By going to the YNZ website you could find the requirements for powerboats planning an ocean passage. this will give you some idea whether a 10 metre powerboat is able to take that journey under its own power
Check the size of containers, could we fit our boat into one?
Look up the shipping options and cost and then we can weigh up which of these three options is most suited to take a 10 metre boat to Austrlia Shipping a Boat
What is the preparation required when a boat is shipped, if it is a new boat or indeed any boat delivered to a new owner in another country you want it to arrive in good condition, what would be the steps to achieve that
