Case Studies

Case study (covers 5 learning outcomes)

These case studies are to be your Portfolio. They will show that you understand the learning outcomes and you know how to apply them in a practical way

Identify the learning outcome that applies to each case study

Put yourself in the position of managing a boatbuilding maintenance and repair yard when considering the following scenario’s
In your position as manager you need to be able to advise your client on a method of repair from initial survey to job completion. Use sketches as appropriate

Most boat owners are very careful about who they get to repair their ‘pride and joy,’ how much it is going to cost and wether they consider the method of repair is value for money. It is usually the manager’s job to assure them that your yard is the one they should choose to complete the repair

Case 1 (Osmosis Repair)

The Client owns a 12 metre power boat which is a “production built planing hull”. He has been grinding out osmosis blisters individually in the past during each annual haul out, however he thinks that the hull may now need a complete osmosis repair

On hauling out the boat you discover that the hull has many blisters and a complete osmosis repair is required
Describe how you would haul out using the Travel-lift

Describe for the owner your repair method including the method of survey



Case 2 (teak deck repair) (survey)

You have hauled out a yacht, which is built in timber using a cold moulded method; she has a plywood deck over laminated deck beams with teak laid over the plywood, this appears to be in good condition. While replacing deck cabin lights on the underside of the deck you discover extensive areas of soft plywood.

You need to establish what the problem is (survey)

After explaining your survey method describe fully how you could repair the problem



You require knowledge of the typical construction method of a “teak over plywood deck”. It is important to establish the cause of the problem so that it won’t happen again



Case study 3
On the same vessel the owner has complained of leaking windows and wants you to re-seal them. They are glass windows in an anodised aluminium frame. There are two main windows on each side and two smaller windows it is simply a matter of removing the windows and resealing them

Describe the process from start to finish step by step.

Specify the materials used

Case study 4

A 15 metre yacht has been holed above the waterline just behind the main chain plates; there is just the one hole with a small amount of surrounding damage.
The hole size is 900mm long starting from just aft of the chain plate and running aft it is 300mm wide in the middle of the topside

You first need to haul the boat in the travel-lift and place it in a cradle, and then move it inside your factory without the aid of the travel-lift, describe this complete process

The hull is composite, the lay up is as follows inner laminate total thickness is 2.5 mm the core is 12mm and the outside laminate total thickness is 3mm

Describe the repair process step by step including re-surfacing and preparing for re-launching


Case study 5

A client has asked you to Ground the underwater metal fittings on his 15 metre power boat.
Describe what he means

She is a wooden carvel planked hull and he has been having problems with galvanic corrosion

Describe what you would do, what concerns you would have, where you would place the zinc anodes, how you would connect to them

Case Study 6

A Stewart 34 has been booked in to your yard for antifouling, and to have the topsides and coamings polished.

She is one of the more recent polyester production laminate boats and when you have a close look you can see that the Gelcoat is in poor condition. There are a number of dings on the hull where the Gelcoat has been knocked and is damaged to the extent water might penetrate. The deck surface has also had a rough time, having had winch handles and other heavy items dropped on it while the boat has been racing.

You decide that you would be better to advise the owner to paint the hull, decks, and cabin top.

You need to justify your opinion that it will be better value for money to paint the exterior of the boat, even though the cost will be considerably more than just antifouling the bottom and polishing the Gelcoat.

Describe the complete painting process specifying the product you will use


Case study 7

You have to make a decision on the best way to get a 10 metre powerboat to a ship to be delivered to a new owner in Australia.
The options are to truck it to the port and have it loaded from the truck to the ship, or you take the boat by its own power to the ship and have it lifted from the water to the deck of the ship by crane.

Dimensions of the boat as follows:
Length 10m, Beam 3m, displacement 4500 Kilo, height of the hull and cabin top excluding ariels and a cradle 3m

The owner has suggested his preference would be to ship his boat in a container
Analyse the options and describe your analyses

The boat is stored at the Oram’s dry stack, describe how the boat is launched or put on a truck.
http://www.yachtsurvey.com/maitenance.htm

/marinesurvey.com/surveyguide/blisterblues.htm