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Post by BF on Mar 9, 2008 16:29:23 GMT 1
If someone confirms that I am right then I suppose that it become a tip. I haven't tried it yet. If I am wrong then please close this thread and it can be a lesson to others.
I see that the way to start is to mark out the centre lines in the bottom hull plates. Mark says that he did this by measuring in several places and (I suppose) calculating the centre.
From my schooldays, it seems to me that if one uses a compass and placing the needle precisely at the edge of the plate, one prescribes an arc and then again from the opposite position on the other side, that the intersection of the two arcs gives you the precise middle point. Is this right? I think so.
As did Mark, best to do this several times and choose the best centreline but I suspect that it could be even more accurate - and certainly quicker than taking measurements of each section.
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Post by afkmatrix on Mar 9, 2008 16:39:46 GMT 1
Is this for the planking or marking the centre point on the Hull?
Personally I just measured the centre of the planks, as I had to trim quite a few as the planking in my last batch was ghastly.
Sorry if your not talking about this subject though.
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Post by BF on Mar 9, 2008 16:52:54 GMT 1
The centre point on the hull. Sorry for not being clear. However, the principle would apply wherever a centre line was needed. However, my geometry was neve great and I might be completely wronf
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Post by Achtung!! on Mar 9, 2008 17:03:15 GMT 1
I was told at school about the compass thing. Is called dissecting a line?
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Post by nm on Mar 9, 2008 17:17:02 GMT 1
No, it's either dissecting a lion or bisecting a line!
NM
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Post by BF on Mar 9, 2008 18:34:34 GMT 1
... or bisecting a line! NM I think that this is broadly the principle anyway. I expect that some Greek mathematician thought it up. Has the Bismark kit been published in Greece yet? I suppose that this kind of thing will come quite naturally to them.
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Post by Mark on Mar 10, 2008 8:18:53 GMT 1
Cool tip BF. Takes me back to my school days. It would certainly work as long as you get the same place, left and right (or port and starboard). I'd suggest putting the compass point into the corners of the cutouts, or some other place that's easy to get exact both sides. Measuring and dividing by two was a bit of a pain.
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Post by BF on Mar 10, 2008 9:26:45 GMT 1
Cool tip BF. Takes me back to my school days. It would certainly work as long as you get the same place, left and right (or port and starboard). I'd suggest putting the compass point into the corners of the cutouts, or some other place that's easy to get exact both sides. Measuring and dividing by two was a bit of a pain. Yes, I envisaged that this would be the tricky part. On the other hand, one faces exactly the same problem measuring across and dividing by two. If the two side aren't exactly opposite each other then the result will not be accurate. I'll link to this thread from the tips forum
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