Category: Modern boatbuilding

Modern and plywood boatbuilding and plans

What John Welsford does with mashed potato

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The transom for John Welsford’s new cruising dinghy design, Pilgrim. Read
about this interesting small boat at his Pilgrim Diaries

Well known New Zealand boat designer, builder and cruiser John Welsford has written tell us about a technique he has developed for testing the rot-resisting properties of unknown timber and plywood:

‘Hi Gav,

‘I thought that you might like to put my comment about mashed spuds in connection with rot testing.

‘Just to stir things up a bit you understand!

‘Rot is due to fungus and needs food, moisture and oxygen in order to grow and spread. Cut off one or more of those and you don’t get rot.

‘Also, rot, like most fungi, spreads far more rapidly in warm conditions.

‘My test method involves placing the sample on a dish in the warmth of the kitchen, and covering it with mashed potato. Potatoes are almost all starch, a form of sugar, and mashing it up with milk brings even more sugars. Mashed potatoes also hold moisture and, being light and fluffy (if made properly) they admit oxygen. So a layer of mashed ‘taties accelerates the rate at which rot takes hold and multiply and is a workable if unusual method of testing wood for susceptibilty for fungal decay. You should see what I do with raspberry jam!

‘Yours, John’

Many thanks John. I might try it some time, though I’d be a bit concerned about this as a practical test. Done properly, it would demand not just well made mash, but would also require brewing up quite a number of different samples. It’s a very interesting idea, but could also be a recipe for trouble in the kitchen that could test more than a piece of wood!

I wonder whether it would work if conducted where no-one goes, round the back of the shed in the summer, and under a plastic sheet?

For more intheboatshed.net posts relating to John Welsford’s boat plans, click here.

For more on John’s plans, see his website; also, there’s a nice new weblog about building a small cruising yacht to his Fafnir plans here.

Christmas 12th Night celebrations on the River Thames with the Lion’s Part

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The Holly Man arrives and addresses the crown outside the Globe Theatre on
London’s South Bank. As usual, click on the thumbnails for larger photos

We travelled to the South Bank of the River Thames in London today to see the Holly Man land from a Thames waterman’s cutter and the doughty Lion’s Part perform their carols and Mumming Play. I didn’t get the name of the boat type correct to begin with – so thanks to Chris Partridge for his comment below.

I brought along my fiddle to lend a hand with the music, but by golly it was cold for a fiddler’s fingers. Julie meanwhile took these photos despite the considerable crowd.

The play was as topical and amusing as one could wish, and The Lion’s Part’s troupe of professional actors includes some very sharp performers. I was particularly impressed with their Doctor – the Doctor in these plays always has the best part, but this particular one seemed to have been born to play it.

See  similar intheboatshed.net post from last year: http://intheboatshed.net/?p=276


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The play in progress; the Turkish Knight; musicians and crowd

Cockleshell Hero canoes at the National Maritime Museum Cornwall

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A new National Maritime Museum Cornwall display explores the evolution of fighting canoes used by the British in World War II.

The oldest canoe in the collection, the Mark II, was made famous by Operation Frankton in December 1942, which was the basis for the film The Cockleshell Heroes.

The real Cockleshell Heroes were Royal Marine Commandos, who got their nickname from the canoes that they used, which were known as cockles. They were difficult to spot at night  and easy to hide, launch attacks and seek out suitable landing places, and could even be used to and could be used to land and collect secret agents. Collapsible types could be carried and launched from submarines.

A brief description of the raid and a collection of relevant links appears at the Wikipedia.

I should explain that much of the information now available and some of the artifacts on show is available thanks to the painstaking research work of  Quentin Rees, who has recently published a book on the topic: The Cockleshell Canoes: British Military Canoes of World War Two.

The exhibition, which runs until the 26th April 2009, includes two other canoes in the exhibition are built of aluminium for use in the tropics, and the display is said to bring together three of the rarest military canoes of the time.