The Scrumble Project

Building “Binary”, a Bob Oram 44′C cruising catamaran, in the Top End of Australia

Shed

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A post that Judy wrote last year about Ten (feeble) excuses why our boat building is slow, points to the very restrictive nature of our shed (tarp) and its location in quiet suburbia.

Although the restrictions imposed by lack of knowledge and motivation (laziness) are probably the major contributor, the shed (tarp) is definitely a close second.

So whilst making all sorts of promises we have had to bite the bullet and fix the shed (tarp).

Therefore we are moving the whole operation to this 20m x 10m facility. The bonus is that it is located on a 5 acre site with a very comfortable home and another small workshop shed.

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Written by Tom

February 3, 2010 at 23:21

Posted in 2010

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Why are my conduit holes through the stern beam asymmetric?

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It’s Australia Day, 222 years of our new culture in a very ancient land, and thank you to our old people who looked after it for probably 200 times longer than that.

…and now, as I am feeling good, I have posed a couple of questions with this post.

I have finally worked out where the single best spot is located, to bring into the engine compartment, every control and source required for the engine’s operation. All these pipes and control cables will be individually chaff protected and will pass through a large conduit that itself passes through the stern beam. This reinforcing maintains the strength of the fore and aft webs and with the conduit ensures the buoyancy void within the beam.

Below – Routed trench through one laminate and core of the rear web part of the stern beam.

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Below two images – rebating the edge core of the future hole.

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Below – The finished rebating of the edge core.

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Below – Wet out of the balsa with a medium viscosity mix of silica, epoxy resin and a touch of micro-balloons.

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Below – 2 X 450mm of tapered 100mm x 1000gsm unidirectional glass wet out and rolled up into a rope.

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Below two images – inserting the glass “rope” into the circular trench.

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Below – The “rope” pushed out into the rebated edge, ensuring there are minimal voids.

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Below – A thick silica, epoxy and micro-balloons mix as an angled dam to hold the runny mixture and uni “rope” in place.

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Below – Two photos, one from each engine compartment looking at the back web.

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Below – Here, after curing, I used the same routing set to repeat the cut, this time, through the lower laminate.
I was cutting away my template guide so had to be very careful at the end and leave a little, then sand with power file.

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Below – Close up of one reinforced hole just cut out. Two down, four more to go.

BTW apart from my title question, what is the diameter of the hole?

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Written by Tom

January 26, 2010 at 01:28

Emperor Penguins and Christmas

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There always seems to be a snow and ice theme involved with southern hemisphere celebrations of Christmas.

I find this to be quite bizarre, even though here in Darwin at the moment – 0001hrs on 25 Dec 2009 – it is 29°C and during the day, 32°C with a wet season cloud cover.

The family has a main celebration meal with an appropriate seafood theme: tiger prawns, bugs (Moreton Bay bug – Thenus orientalis, a type of slipper lobster), cold baked ham, turkey breast with cold salads and a decorated fruit cake (Christmas cake).

We are 3151 nautical miles from the nearest Emperor Penguins in Antarctica where the sea ice has melted, and they would be fishing at present, diving deep in the southern ocean. Our only commonalities would be that we are in the southern hemisphere, and like the sea and fishing.

So somehow these little people have been associated with a northern winter and Santa Claus, judging by the hats. However they are very cute and the cake, built by the Water Wife and the Water Daughter, looks very good.

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Written by Tom

December 25, 2009 at 00:20

Posted in 2009 Jul-Dec

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