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Author Topic: Back to Basics II - How to convert hull lines into an actual model  (Read 5093 times)

RipSlider

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Hello all.

This is the second of my "I'm being rubbish and I want to sort it out" questions.

There are a number of boats that I am interested in building. I have no issues mapping out the super structure, but I am stumped by the issue of how to convert Hull lines into a an actual piece of wood with which I can start to lay down a hull.

What I mean by "Hull lines" is where you get a series of 1/2 cross sections on a single image, essentially a vertical line with a series of 1/2 curves sticking out from it.

I wonder if someone would be kind enough to talk me through the process of taking these curves, scaling them, and transferring them to an actual design?

Many thanks indeed.

Steve
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Shipmate60

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Re: Back to Basics II - How to convert hull lines into an actual model
« Reply #1 on: October 21, 2007, 11:57:59 am »

RipSlider
I hope you are sitting comfortably.
The "1/2 Sections" are the shape of the frames.
Measure the top of the frames to the highest point on the keel, (usually the highest point of the deck at the bow)
If you copy these on to a separate piece of paper individually you will be left with a series of individual half frames.
I use a centre line then use some tracing paper to copy exactly the shape.
Now add a broad centre section(not the full width) up to the measured highest point of the deck, and mark this Square to the centre line.
Then draw the shape on the back of the tracing paper which if you use a soft pencil should transfer the line faintly to the original paper.
Fill in this line and you have a full frame section all the same height.
Label each one as you do it.
You can just draw the 1/2 frame then cut it out, fold the paper carefully along the centre line and cut out the other half, that is up to you.
Cut out these paper templates, keeping them numbered on the template.
You will end up with a lot of pieces of paper!!
Make a template of the Keel from the drawing allowing full height at the Bow and Stern.
Cut out the Keel from your chosen material.
I usually use 1/8" ply for this.
This alone does not make a very strong keel YET.
Glue all the templates to your chosen frame material. A "reasonable width" is best.
From the original drawing mark in the frame positions.
Cut all the frames out to the template including the extra height.
If you are making the frames hollow, cut this out now too, but leave sufficient material to give the frames sufficient strength to have pins hammered into them!!
You will now need to "notch the frames to fit over the keel, a good reasonably tight fit is required.
I prefer to make hulls inverted, i.e. Keel uppermost.
Now you will need to select a good strong FLAT building board longer and wider than the hull.
Mark the board with the frame stations with a line drawn at 90 degrees to the centre line. This is important as it will ensure the frames are 90 degrees to the keel.
I screw scrap wood along these lines. 1 piece for each frame position, but make sure this wood is 90 degrees to the board!!
I use a small amount of superglue to hold the frames vertical and dead along the centre line.
When it has all set fit the keel into these frames, checking it lines up with all the framing marks and the fore and aft marks on the building board.
Set the keel into the frames allowing it to stand proud the height of your planking material.
Now glue it all together and leave for a few days to set.
When it is all fully set fit some sandpaper on a piece of flat wood, 1 full sheet long, and gently smooth along the length of the frames to ensure that they have a full face contact along the whole length of the hull.
Before you go any further check all the measurements, then go for a coffee, check them again, then sleep on it and check them again!!!!
If all is to your satisfaction you are ready to start planking.
If not adjust, or repair till it is.

Bob

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John W E

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Re: Back to Basics II - How to convert hull lines into an actual model
« Reply #2 on: October 21, 2007, 12:32:22 pm »

Hi Ripslider

There is a topic 'FROM A LINE TO A MODEL' on this Forum which, along with Shipmate60s explanation may help you understand how we transpose lines from a plan to make a model.

Hope this is of some help to you.

Aye
John E
bluebird
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RickF

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Re: Back to Basics II - How to convert hull lines into an actual model
« Reply #3 on: October 21, 2007, 04:44:32 pm »

Ripslider,

Bob has given probably the most concise explanation of building the framework for a hull I've ever read - well done Bob. I think the only thing he omitted was to reduce the frames all round by the thickness of the hull planking.

It's even easier to produce the frame plans if you have a drawing package on your pc - just import the original, trace around the frame and flip the image. You can then scale to reduce for planking, draw in all the cutouts, print the sheet and stick it on your plywood.

Rick
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Umi_Ryuzuki

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Re: Back to Basics II - How to convert hull lines into an actual model
« Reply #4 on: October 22, 2007, 06:42:41 am »

Heres a couple of picture threads that might be helpful...

This one uses two boats to highlight basic construction on a keel
http://groups.msn.com/ModelersAndHobbyForum/typicalshiphullconstruction.msnw

This is a variation on the method.
http://groups.msn.com/ModelersAndHobbyForum/japaneset103lstbuildup.msnw

another small series of images...
http://www.rcgroups.com/forums/attachment.php?attachmentid=389384
and the one following it...
http://www.rcgroups.com/forums/attachment.php?attachmentid=389419

oh, and one more....
http://www.queensown.org/photo-gallery/5.html

 8)
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Martin (Admin)

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Re: Back to Basics II - How to convert hull lines into an actual model
« Reply #5 on: November 23, 2007, 06:09:52 pm »



Good thing there are not more opportunities to get hull lines like this....


http://news.bbc.co.uk/1/hi/world/americas/7108835.stm
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tigertiger

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Re: Back to Basics II - How to convert hull lines into an actual model
« Reply #6 on: November 24, 2007, 02:26:42 am »



AArrgghhhhhh!!!!
BBC news website blocked in China, cannot see image. Dagnabit.
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Martin (Admin)

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Re: Back to Basics II - How to convert hull lines into an actual model
« Reply #7 on: November 26, 2007, 12:10:47 pm »

AArrgghhhhhh!!!!
BBC news website blocked in China, cannot see image. Dagnabit.

Hmmmmm, that's interesting!

Here's the picture and blurb....


Stricken Antarctic ship evacuated 
 
More than 150 passengers and crew have been rescued from a stricken tourist ship after it hit ice off Antarctica.
The M/S Explorer is now lying on its side close to the South Shetland Islands, in the Antarctic Ocean.

Gap Adventures, which owns the ship, said 91 passengers, nine guides and 54 crew members were safely evacuated to lifeboats and then to another ship.

After staying the night at a base on a Chilean island, they are expected to fly to Chile's mainland on Saturday.

Gap Adventures said 23 Britons, 17 Dutch, 10 Australians, 13 Americans and 10 Canadians were among the 154 on board.

The remaining nationalities of the rescued tourists are Irish, Danish, Swiss, Belgian, Japanese, French, German and Chinese, said the Toronto-based tour company.

Following the news of the incident, the specialist Lloyds List maritime publication said the 2,400-tonne Explorer had five faults at its last inspection.

  We were passing through ice as usual but this time something hit the hold and we got a little leakage downstairs

Peter Svensson
first officer

However, the UK Maritime and Coastguard Agency (MCA), whose inspectors found the faults, said that they had all been rectified by the time the ship set sail again.

"These were not huge problems and were all rectified before the vessel sailed. It would not have been allowed to depart if everything had not been sorted out," MCA spokesman Mark Clarke told PA news.

All passengers and crew were transferred to a Norwegian cruise ship, the Nordnorge.

'In good spirits'

The passengers would be transferred to Chile before being flown home on Saturday, said Gap Adventures.

"They are all in good spirits," company spokeswoman Marie Anne MacRae told the BBC News website.

Paola Palavecino, an ornithologist onboard the rescue ship, the Nordnorge, told the BBC that four of those rescued had suffered moderate hypothermia, but that they had later recovered, having eaten and been given additional warm clothes.

 

The group had embarked from Ushuaia, on Argentina's southern tip, on 11 November for a 19-day "Spirit of Shackleton" cruise through the Drake Passage.

The captain and the first officer abandoned the Liberian-registered Explorer after initially remaining on board to pump water.

First officer Peter Svensson told Reuters: "We were passing through ice as usual. But this time something hit the hold and we got a little leakage downstairs.

"No one was hysterical, they were just sitting there nice and quiet, because we knew there were ships coming."

'Deficiencies'

According to a report on Lloyds List's website, the Explorer was found to have five "deficiencies" at an inspection in May at Greenock, Scotland, by the UK's Maritime and Coastguard Agency (MCA).

Watertight doors were described as "not as required", while lifeboat maintenance problems and missing search and rescue plans were also noted.

  The hull has a hole the size of a fist and the outlook is not so positive for the ship at the moment

Susan Hayes, vice-president of marketing for Gap Adventures

Chilean port inspectors also found six deficiencies during an inspection in Puerto Natales in March, including two related to navigation matters, said Lloyds List.

Gap Adventures said the Explorer was passed as fit for sea by inspectors in October this year at a dry dock before their tourist season began.

The MCA said it became aware at 0524 GMT on Friday that the expedition ship was in distress near King George Island.

It ran into trouble approximately 120km (75 miles) north of the Antarctic Peninsula.

Susan Hayes, vice-president of marketing for Gap Adventures, said: "The hull has a hole the size of a fist and the outlook is not so positive for the ship at the moment."

The company said the pumps had been used in an effort to stop the ship sinking. But the vessel is now lying on one side, with its hull exposed.

The rescue operation was co-ordinated by the Ushuaia coastguard.

Prices for the 19-day tour start from around $8,000 (£3,900) per cabin.

Gap Adventures said that before Friday's incident, the tour group had visited the Falkland Islands to spot black-browed albatrosses, before going to South Georgia to see Shackleton's grave and the king penguin colonies.


Coastguards said the weather conditions were good for this time of year, though the average temperature is still -5C.


The people rescued from a ship that sunk after hitting an iceberg in Antarctica have spoken of the drama.
The last of the passengers and crew of the MS Explorer have now reached Chile after abandoning ship on Friday.

Passenger Gillian Lee, from Telford, Shropshire, told a newspaper she was "lucky to be alive".

She said: "It was quite frightening at the time as the ship was taking on water and we knew we were hundreds of miles from anyone else."

The 154 people had to take to lifeboats after striking an iceberg that caused a hole in the ship.

 
They waited in the lifeboats, surrounded by floating sheets of ice, for several hours before a Norwegian cruise ship picked them up.

Passenger Gillian Plant, 40, of Manchester, England, praised the ship's captain for the way the evacuation was handled.

She said on Saturday: "There was no panic at all and no injuries. Everybody is perfect, no bruises, no scratches."

Whale wait

She said they passed the four-and-a-half-hour wait to be rescued by watching for whales.

The Explorer was on a 19-day circuit of Antarctica and the Falkland Islands, letting passengers watch penguins, whales and other wildlife.



M/S EXPLORER
 
Built: 1969, Finland
Capacity: 100 passengers
Tonnage: 2,400   Cruising speed: 11 knots
Engines: 3,800 hp diesels
Crew: 54 

First custom-built expedition ship
Known as the 'Little Red Ship' to aficionados
Became the first passenger vessel to navigate the North West passage in 1984
Involved in rescue of crew from Argentine cargo vessel off Anvers Island, Antarctica, in 1989
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tigertiger

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Re: Back to Basics II - How to convert hull lines into an actual model
« Reply #8 on: November 26, 2007, 12:44:18 pm »

Thanks for posting that Martin :)
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MTB

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Re: Back to Basics II - How to convert hull lines into an actual model
« Reply #9 on: February 07, 2008, 04:44:58 pm »

wel done lads a  thorny subject that had been giving me the willies for a couple of months while trying to sort my head about what to build next........needs to be cheap (so a kits no good...........wabt to get started in time to finish this spring if possible.............would like some thing differentsomething there are not lots of kit ones about.........................not too big.bit stuck for romm at home these days.
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barriew

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Re: Back to Basics II - How to convert hull lines into an actual model
« Reply #10 on: February 08, 2008, 11:13:07 am »

How about this - free plan from Model Boats last year, few sheets of Plasticard, and the motor etc.

Barrie

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