TX18 Centre stringer fit and modification

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fallguy1000
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Re: TX18 Centre stringer fit and modification

Post by fallguy1000 »

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.
047211ED-4B89-4A5E-BC73-7B76030E110C.jpeg
Now consider how to scale it vertically.
D0B4D555-0727-4C14-A031-34146ACDBE87.jpeg
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..
My boat build is here -------->

viewtopic.php?f=12&t=62495

fallguy1000
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Re: TX18 Centre stringer fit and modification

Post by fallguy1000 »

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
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.
Last edited by fallguy1000 on Sat Nov 06, 2021 10:50 am, edited 1 time in total.
My boat build is here -------->

viewtopic.php?f=12&t=62495

fallguy1000
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Posts: 10198
Joined: Tue Jan 12, 2010 12:25 am

Re: TX18 Centre stringer fit and modification

Post by fallguy1000 »

Here is a drawing showing how scaling from the sole would result in flattening the inverted shape.
4A6110AF-7D53-4F34-9C34-8B1296845877.jpeg
My boat build is here -------->

viewtopic.php?f=12&t=62495

Dougster
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Re: TX18 Centre stringer fit and modification

Post by Dougster »

fallguy1000 wrote: Fri Nov 05, 2021 2:26 pm
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
I can't find the pic, but I trust you. The blog link is broken as well, but I trust you.
Click on my link and scroll down to the 10th post. At list it works for me. It's an old photoshop pic.

Dougster

Vundu
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Re: TX18 Centre stringer fit and modification

Post by Vundu »

Dougster wrote: Sat Nov 06, 2021 9:48 am
fallguy1000 wrote: Fri Nov 05, 2021 2:26 pm
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
I can't find the pic, but I trust you. The blog link is broken as well, but I trust you.
Click on my link and scroll down to the 10th post. At list it works for me. It's an old photoshop pic.

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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