FS19 Build

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Mr. Roux
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FS19 Build

Post by Mr. Roux » Sat Feb 24, 2018 5:02 pm

Back on the build of the FS 19, after a six month break. At that time I encountered a problem with the stringer standing proud at Station "E", 1/4" too high. So, yesterday and today I pulled off all the molds and rechecked measurements, checked station spacing, and re cut station E just to make sure. No change, so I checked my measurements on station E and interpolated the depth of the stringer notch on that mold should be 6 1/8" at 16 1/4" from CL, which it is. The corresponding stringer height at station E as per page 314/9 has a stringer height of between 6 1/4" and 6 1/2". It appears that the stringer is too high. The height of my stringer at station E is 6 3/8". Am I missing something? Should I just cut the notch deeper on that mold? Any ideas would be appreciated. Thanks



Dougster
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Re: FS19 Build

Post by Dougster » Sat Feb 24, 2018 5:17 pm

I believe that's what I would do, as long as things look and measure fair. 1/4" doesn't seem like much, but a picture might help.

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Re: FS19 Build

Post by Browndog » Sat Feb 24, 2018 9:48 pm

There were similar issues at that stage of my build as well. The stringers being proud of the mold frame can lead to hard spots and a lumpy or bumpy appearance to the hull. I had to “finesse” some of the notches to get it all to fit & be fair. The fairness of the hull is paramount. You should be looking for fair and continuous curves of the hull panels on the mold with no lumps, hard spots or dips. The distance between frames can sometimes lead to some sagging of the plywood between the frames. Double check your mold spacing as well, taking into account the thickness of the molds to get the proper location on the strongback as that can lead to notch depths and stringer heights not lining up. The notches are self aligning if you remain a bit flexible on the mold frame spacing.

When you flip the hull the stringers will get removed initially and then put back in after you have laid fiberglass cloth down on the inside of the hull. The frame notches will all have to be reviewed and possibly adjusted due to the thickness of the fiberglass cloth, especially if you reinforce areas with a second layer of cloth.

Whatever you do, adjust or fix and keep building! Would love to see some pictures of other FS -19’s being built.

Mr. Roux
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Re: FS19 Build

Post by Mr. Roux » Sat Feb 24, 2018 10:00 pm

Will try to post pictures tomorrow.

Mr. Roux
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Re: FS19 Build

Post by Mr. Roux » Sun Feb 25, 2018 6:38 pm

Here are some pictures of an overview, closeup of stringer intersection at station F and closeup of stringer at station E. Hope this gives you an idea of what I'm looking at.
Attachments
IMG_20180225_171254500.jpg
IMG_20180225_171500980.jpg
IMG_20180225_171435374.jpg

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topwater
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Re: FS19 Build

Post by topwater » Mon Feb 26, 2018 7:29 am

I had a similar problem with my stringers . I cut the notch deeper and layed a straight edge across all three molds
and moved it until flush. Use the straight edge to check that everything is fair and build on.
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Dougster
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Re: FS19 Build

Post by Dougster » Mon Feb 26, 2018 9:31 am

I like Topwater's approach. Check that the stringers are level too.

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Mr. Roux
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Re: FS19 Build

Post by Mr. Roux » Mon Feb 26, 2018 9:52 am

Thanks for the ideas, pulled a string at center line and looks good, will probably cut the molds and adjust. Frustrating, that I might be missing something simple that is causing this problem.

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topwater
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Re: FS19 Build

Post by topwater » Tue Feb 27, 2018 7:44 am

It absolutely drove me nuts , finally i told myself to stop overthinking everything and build on .
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Mr. Roux
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Re: FS19 Build

Post by Mr. Roux » Tue Feb 27, 2018 9:17 am

Well, it has driven my nuts, took everything apart yesterday, made sure the strongbacks were straight, one was out by 1/8", station placement was off by 1/2". Putting it all back together today, and will evaluate it at that time.

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