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Author Topic: Marking a Waterline  (Read 498 times)

Charlie

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Marking a Waterline
« on: June 21, 2022, 03:52:50 pm »

How do people do this? I was thinking of making some kind of height gauge, but any suggestions are most welcome

dougal99

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Re: Marking a Waterline
« Reply #1 on: June 21, 2022, 04:53:39 pm »

I eventually bought an Amati tool do do the job but I have used wood blocks anf tins of the appropriate size. The tool is infinitely adjustable and saves me searcing hte workshop for something suitable.
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John W E

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Re: Marking a Waterline
« Reply #2 on: June 21, 2022, 05:27:52 pm »

hi there


I made a gauge up from scap pieces of plywood and use a pencil clamped to the gauge to mark the waterline.


Thing to remember is - mark your bow and stern heights correctly and make sure they are levelled off (check this on a flat surface) and then draw your line around the hull.


I have also, in the past, read where people have filled a bath full of cold water and then sprinkle talcum power on top of the surface of the water and then place the hull in the water so that it is at the correct depth and when removing the hull from the bath water, the talcum power leaves a line around the hull at the correct level.    I haven't tried this idea myself, but, there are also numerous more methods out there.


No doubt someone else will come on here with an ingenious one.


Here are a couple of pics.


1,   Of the gauge I made


2.   The hull which I have previously marked off with this gauge and masking tape - and - it is now ready to be painted.


John



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Colin Bishop

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Re: Marking a Waterline
« Reply #3 on: June 21, 2022, 06:00:06 pm »

John's method is simple,cheap and has always worked for me.

Colin
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Mike S

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Re: Marking a Waterline
« Reply #4 on: June 21, 2022, 07:08:46 pm »

I've actually used the 'talcum powder in the bath' method. It was a tip from the late, great Vic Smeed in a copy of Model Boats magazine way back in the last century. It is especially suitable for complex hull shapes, and produces a very accurate result. The only drawback being, of course, that you have to clean the bath before one's 'significant other' returns home!




Cheers,


Mike



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mrlownotes

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Re: Marking a Waterline
« Reply #5 on: June 21, 2022, 08:52:20 pm »

I use a self levelling laser level on a camera tripod by the side of the workbench.

1. Mark the waterline at either end of the hull.
2. Place short spirit level across the beam for port/starboard accuracy.
3. Adjust height of tripod/laser to line up with front and rear waterline marks.
4. Trace along laser line with soft pencil for an almost perfect result.

Obviously not the cheapest option, but I already had the laser in my household toolkit and the tripod for my photography.






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Charlie

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Re: Marking a Waterline
« Reply #6 on: June 21, 2022, 11:48:47 pm »

Thanks for the replies. Itís been so long since I did this that my mind just went blank! Tomorrow I will knock something up out of scrap wood.

Umi_Ryuzuki

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Re: Marking a Waterline
« Reply #7 on: June 22, 2022, 01:11:43 am »

Level the hull  on nice flat surface.
Then build yourself a T-stand and glue the pencil where you want it to meet your hull.
 
 :-)
 

Backerther

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Re: Marking a Waterline
« Reply #8 on: June 22, 2022, 02:39:09 am »

Hi Charlie;
I post here my case of drawing a line of 1/96 HMS Fencer for your reference.To get the best result,the following procedures and sequence were carried out seriously and done successfully in one time. :-))

1;I used a dining table as the working base after checking the surface.
2;I used this tool that I bought for RC planes,however, home-made tool will do sufficiently.
3/4;I set the hull seriously to get her horizontally and vertically sat using as many level gauges as I had and fixed her properly.
5;I measured the height.
6/7/8;Started to draw a line to the stern,and successfully met the line at the stern with a line of opposite side, nearly "just meet !! " {-) {-) :-)) :-))


Wishing a very good result in your boat as well!! :-))


Kiyo
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Charlie

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Re: Marking a Waterline
« Reply #9 on: June 22, 2022, 09:04:59 am »

So i knocked this up this morning. This should do the job :-))

Geoff

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Re: Marking a Waterline
« Reply #10 on: June 22, 2022, 04:11:57 pm »

One thing to consider is that often waterlines are not flat but have a slight rise at the bow and stern - makes it even more fun!


Geoff
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Colin Bishop

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Re: Marking a Waterline
« Reply #11 on: June 22, 2022, 04:41:41 pm »

Yes Geoff is right that waterlines are not always quite level. A slight rise at the bow is common as otherwise you can get an optical illusion that it is curving downwards slightly as the hull narrows.

Colin
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John W E

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Re: Marking a Waterline
« Reply #12 on: June 22, 2022, 04:53:19 pm »

seek and ye shall find :-)  I knew I had an image of my water line gauge in action :-)


it actually comes from my build of the fishing vessel Frederick Spashett  - and here is a shot of her on the water.   If you notice how the water line isn't parallel to the keel and you will see this in the drawing.


Aye


John



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roycv

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Re: Marking a Waterline
« Reply #13 on: June 24, 2022, 12:04:28 pm »

Hi appreciate all the above, I love the talcum powder idea.  I use a coloured felt tip pen which only has to touch to leave a line.  I use the type that rub off afterwards with a damp cloth.
Regards
Roy
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