GF12: Missing Measurement

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ThailandBoats
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GF12: Missing Measurement

Post by ThailandBoats » Tue Jul 17, 2018 12:53 pm

Please provide the measure for the "X" in the attached diagram.

The height from the straight edge of the board is not provided. I estimated this number but would like an exact measurement if possible.
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Screen Shot 2561-07-17 at 23.47.08.png



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Re: GF12: Missing Measurement

Post by ThailandBoats » Tue Jul 17, 2018 1:13 pm

This measure on the clamp board appears to also be missing although doesn't appear as important.
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Re: GF12: Missing Measurement

Post by jacquesmm » Tue Jul 17, 2018 1:17 pm

It is the same outline as the transom. Use the transom as a template.
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Re: GF12: Missing Measurement

Post by ThailandBoats » Tue Jul 17, 2018 11:37 pm

The transom is missing the bottom measurement as well.

Can you provide these three measurements?
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Screen Shot 2561-07-17 at 23.47.08.png
Screen Shot 2561-07-18 at 00.07.44.png
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Re: GF12: Missing Measurement

Post by ThailandBoats » Tue Jul 17, 2018 11:51 pm

You can see in these diagrams, all other boards have the measurement from the mid-line out to the bottom corner. That measurement is missing on the transom, clamp board, and the measurement is missing on the front of the boat.

Can you provide all three measurements?
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Screen Shot 2561-07-18 at 10.49.31.png

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Re: GF12: Missing Measurement

Post by ThailandBoats » Wed Jul 18, 2018 2:35 am

The points marked with a RED "X" are missing from the plan without a way to determine with 100% certainty. Some guesswork could be employed to figure it out but would prefer to have the 4 measurements from a designer.

NOTE: All measurements should be given from the midline or the straight edge of the board.
Attachments
Screen Shot 2561-07-17 at 23.47.08.png
Screen Shot 2561-07-18 at 10.34.39.png
Screen Shot 2561-07-18 at 00.07.44.png

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Re: GF12: Missing Measurement

Post by DAVE LUDICK » Wed Jul 18, 2018 6:20 am

On my GF14 plans the measurement for the transom from centre to chine at the bottom is 508mm. For the clamping board use the transom as the template and measure down 266mm.
The measurement for the bottom sheet, I would do as follows, measure the 786mm as shown and where the batten you use to create the curve meets the 786mm line that will give you your point.
Hope this helps, the GF 12,14 and 16 are basically all the same boat, just lengthened in the 14 and 16ft version.

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Re: GF12: Missing Measurement

Post by ThailandBoats » Wed Jul 18, 2018 5:01 pm

The plan requests 12mm marine plywood for the transom and 2 clamping boards.

I am using 10mm marine plywood for my transom and clamping boards. (That's what I could find here in my town in northern Thailand. Very surprised I could get that - actually!)

Instead of my total width being 36mm (Transom 12mm + 2 clamping boards 24mm = 36mm, my transom + 2 clamping boards will be 30mm. This is a 20% variation. Will this create any issues?

I am also using 7mm plywood and could get a 3rd clamping board to make the transom a total of 37mm but that seems excessive.

First time building a boat so good feedback is helpful.

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Re: GF12: Missing Measurement

Post by jacquesmm » Wed Jul 18, 2018 5:19 pm

Dimensions, one picture at a time.
For the chine edge, I expect the builder to draw a line through all the points I show, extend it a few inches and mark a point at 786. It will be fair.
Transom middle: it is the height of the shaft. The width is the width of the bottom panel but I should have shown it there too.
Clamping board: same shape as the transom. Use the transom as a template.

I will check tomorrow, those dimensions may also be on another drawing.
Please post the drawing numbers when asking about dimensions.

See this for drawing the transom:
http://bateau2.com/howto/shaftlength.php

Please post the drawing numbers and I will give a better answer tomorrow but you should be able to proceed with the information above.
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Re: GF12: Missing Measurement

Post by ThailandBoats » Thu Jul 19, 2018 12:08 am

Using that information helps on many aspects and I have done as described. Thank you.

The clamping board shows a mid-line 10mm shorter than the lines on the immediate sides. 235mm mid-line and the next line immediately outside that as 245mm. A 10mm difference.

Lacking the information just provided and the mid-line for the transom, I followed the same pattern as the clamping board for the transom. Given the line just outside the mid-line of the transom is marked as 513mm, that would make the transom mid-line 503mm. With that said, if the transom midline is suppose to be the shaft length of 508mm, following the clamping board, the line immediate left should be 518mm. not 513mm as labeled in the plans. Is that correct?

We are talking about a variation of only 5mm, I doubt that will make a huge difference but I would like to make the boat as close to proper plan as possible.
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