2011년 8월 30일 화요일

30082011(lofting-station5)

We have got further today. Vaughn made us more battens for suitable size and small ones for drawing stem face. There is more information on stem face because the curve changes stiffly, so it is better to put more station lines in that section. For this reason, usual battens are likely to brake. This is why Vaughn made us them more. We can even plain the middle of the batten in order to make it flexible to do make more variable curve. Chris told us how to look after battens and about the safety(fire hose reel). He showed us a special tool called 'duck' which was a pure one. The shape of it was made for grabbing easily and if there is stiff circle, the shape make it fit into push a batten. Duck can let our hands free. Decoding table of offset was quite hard and I was struggling to start drawing body plan. Finally, Tapu and I could not solve that and Chris told us about the sequence of lofting, which is important. The goal today was drawing station 5, station 4 at the body plan, so we did and came home.
There are heaps of information in the table of offsets. I think I am almost getting at, but still missing some information. After I came back home, I looked into it and I found something about the offset half-breadths which is the last table on it. On the table, WL1, WL2, WL3 and WL4 make flat surfaces(of course) but Cur 0, Cur 1 and Cur 2 do not make surfaces, though they look like flat surfaces on the half-breadth view. Regarding offset heights, those Cur ones are not on the flat surface as well. Water lines and buttock lines do not meet each other. They are not relavant at all. In the same station, Cur ones sit on exactly same points, but Butt ones and WL ones are sitting on different locations.

LOA - length overall
how to calculate the displacement?
three icons discribing beams and heights
common interval - the gap between one station and the next station
buttock fifty(buttock 50)
waterline negative 60(waterline - 60 of d60)
freeboard - the height between waterline and sheer
draft - the depth between waterline and keel(negative)
heights - can be both of those two

New Zealander adopted the metric system in 1976.
stem face is connected with keel at a proper point somewhere between them.
Be aware of using the word stem and stem face.
batten flattening(bugger...forgot it..)
lifting off(what is it?)
planking thickness(where were these words from....)
scantling - it has many meanings regarding shipbuilding, shipping and timbers. I suppose I heard about this today was regarding timber, which means that the breadth of thickness of a timber.

Chris told us that scarphed batten is not good, because two timber's grains are obviously different and it will not give fair curves. The curve has to be on the points, but if it is quite sure that the curves run through them, let the batten naturally run. Sitka spruce is a good type of wood for using as a batten(slow growing), 100m high, slow growing.

Here is the sequence.
Sheer - profile
Canoe body - profile
Stem face - profile
Chine - profile
Deck line - H/B(half breadth)
Chine - H/B
Station 5 - body plan(station number can be different, so what it means is to draw the line of the widest beam of ship at port side)
Staion 4 - body plan(the widest of starboard)
B 200 - profile
LWL - H/B
the other stations - to draw them from being capable of seeing roughly(whole body) to seeing in detail

It can be slightly changed up to a lofter or a designer.(arrange the best sequence for oneself)
Wahoo! Bloody excellent! We have taken a photo today by Tapu's camera~but my knees are getting worserer(or on the way to be betterer?)
I still can not understand the whole things, I am really trying to get into it, though.


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