Okay, scaling a W is not easy.
The inverted bottom is indeed a W shape, and you can't just make all the tops higher and you can't scale from the baseline or the sole.
Consider the following picture.
Now consider how to scale it vertically.
Can you show us your mw drawing with the numbers? Since you used the sole, all your numbers might have been reductions, but the middle of mw (and all the BH) should be lower...not 10% higher. (On the upside down jig)
Friendly comments welcome. I think the scaling is perhaps wrong..
TX18 Centre stringer fit and modification
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- * Bateau Builder - Expert *
- Posts: 10199
- Joined: Tue Jan 12, 2010 12:25 am
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- * Bateau Builder - Expert *
- Posts: 10199
- Joined: Tue Jan 12, 2010 12:25 am
Re: TX18 Centre stringer fit and modification
I can't find the pic, but I trust you. The blog link is broken as well, but I trust you. I read the pages the other way, so it is 70 for me. Funny thing is, this is almost like the scaling issue I highlighted.Dougster wrote: ↑Fri Nov 05, 2021 12:55 pm Transom is straight on the bottom. Scroll down on this link and see pic:
viewtopic.php?t=15242&start=90
Also use DaveTx's link to his blog to see more.
Dougster
Last edited by fallguy1000 on Sat Nov 06, 2021 10:50 am, edited 1 time in total.
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- * Bateau Builder - Expert *
- Posts: 10199
- Joined: Tue Jan 12, 2010 12:25 am
Re: TX18 Centre stringer fit and modification
Here is a drawing showing how scaling from the sole would result in flattening the inverted shape.
Re: TX18 Centre stringer fit and modification
Click on my link and scroll down to the 10th post. At list it works for me. It's an old photoshop pic.fallguy1000 wrote: ↑Fri Nov 05, 2021 2:26 pmI can't find the pic, but I trust you. The blog link is broken as well, but I trust you.Dougster wrote: ↑Fri Nov 05, 2021 12:55 pm Transom is straight on the bottom. Scroll down on this link and see pic:
viewtopic.php?t=15242&start=90
Also use DaveTx's link to his blog to see more.
Dougster
Dougster
Re: TX18 Centre stringer fit and modification
Dougster wrote: ↑Sat Nov 06, 2021 9:48 amClick on my link and scroll down to the 10th post. At list it works for me. It's an old photoshop pic.fallguy1000 wrote: ↑Fri Nov 05, 2021 2:26 pmI can't find the pic, but I trust you. The blog link is broken as well, but I trust you.Dougster wrote: ↑Fri Nov 05, 2021 12:55 pm Transom is straight on the bottom. Scroll down on this link and see pic:
viewtopic.php?t=15242&start=90
Also use DaveTx's link to his blog to see more.
Dougster
Dougster
Hi, I have not been able to do any work on this, and will not be able to work on it for a week or so due to an unforseen emergency. I do, most sincerely, appreciate all input, thats why I am here!
Dougster, sorry if I have not read your posts correctly, I am somewhat pre occupied at the moment. I did not scale vertically, from the baseline, I scaled each leg of the W, \ / \ / and all the horizontal measurements (beam and length) on the plans by 10%, in otherwords, every single measurement on the plan was scaled 10%. That way I think all the angles would all remain the same.
I did look at the bulkheads briefly today. The chine panel sections of Bulkheads ( first \ and last / of the W) D, MW and Transom align perfectly.
I hope to be back with more information by next weekend.
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