Fs17 LS jig question

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rbecker08
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Fs17 LS jig question

Post by rbecker08 » Thu Jul 05, 2018 10:44 pm

So starting laying out my frames on my jig and noticed an issue/question. The plans call for a 14' strong back but the frame layout ends at 12' ish leaving roughly 2' of extra jig and five feet or so of un supported deck to make up much length. The bow mold is 3'ish which still leaves me with an fs15. So what did I miss, is there a different bowmold for the LS version or is there no bow mold at all just squeeze em together. Open to any thoughts. Thanks Rich
20180705_213652.jpg
Last edited by rbecker08 on Fri Jul 06, 2018 12:01 am, edited 2 times in total.



narfi
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Re: Fs17 LS jig question

Post by narfi » Thu Jul 05, 2018 10:53 pm

A to E are each 3ft apart. That is 12ft.
The transom is 18 more inches beyond E and angles back for a few more inches.
Frame A to the bow is just over 3ft(make sure to make the steongback tall enough the bow doesnt go through the floor like I did).

This adds up to roughly 17ft if built standard version to plans.
20171230_213534.jpg
20171230_213519.jpg

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Re: Fs17 LS jig question

Post by rbecker08 » Thu Jul 05, 2018 11:14 pm

narfi wrote:
Thu Jul 05, 2018 10:53 pm
A to E are each 3ft apart. That is 12ft.
The transom is 18 more inches beyond E and angles back for a few more inches.
Frame A to the bow is just over 3ft(make sure to make the steongback tall enough the bow doesnt go through the floor like I did).

This adds up to roughly 17ft if built standard version to plans.

20171230_213534.jpg

20171230_213519.jpg
The LS has no frame e if I am not mistaken plans show A through D and a transom.

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Re: Fs17 LS jig question

Post by narfi » Thu Jul 05, 2018 11:29 pm

Just realized you are doing the low sheer so it will probably be a couple inches shorter.
But here is where I am now with standard sheer.
20180705_190028.jpg
That extra 2 inches is the point of the rubrail at the bow.

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Re: Fs17 LS jig question

Post by rbecker08 » Thu Jul 05, 2018 11:33 pm

So if I had another frame the motor well one I would be fine....but I dont I am sure there is something I missed just need to find it now before I take a saw to the jig

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Re: Fs17 LS jig question

Post by narfi » Thu Jul 05, 2018 11:36 pm

You are right. Theframes are different. However if you look at the layout on page B284/7 you can see that from frame A to the bow is much more than 3ft, it looks like the 4-5ft you should expect.

I haven't studied the low sheer options so I'm afraid I cant offer much other than I hope you figure it out.

It will be a sweet boat when you are done.

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Re: Fs17 LS jig question

Post by jacquesmm » Fri Jul 06, 2018 9:45 am

The plans show the jig for and bow mold for the standard version. See the note on drawing A284/5: Base version.

The strong back dimensions are for the Base version. For the LS version, it is very simple: all decks, fore and aft are in the same plane. That means that all the tops of all the frames are at the same level and can sit on a pair of 2x4's used as strongbacks.

The bow mold is the same for all versions, it does not matter if the mold sticks out in the LS version, it is just a mold. The bow mold is fastened to the first frame (A). In the LS version, that frame is in a different location: extend the bow mold to that frame. The frame locations for the LS version are on A284/6.
In the LS, frame A is at 36+36+36+36.
In the standard boat A is at 18+36+36+36+36.
= in the LS, frame A is 18" further back = extend the bow mold by 18".

Those who have the plans will understand why I use that weird notation, it matches the plans.
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Re: Fs17 LS jig question

Post by rbecker08 » Fri Jul 06, 2018 1:25 pm

Got it thanks....so I am going to add a 18" spacer to my current bow mold and mount to frame A and trim the jig to match, essentially cutting 2 ft off the jig
jacquesmm wrote:
Fri Jul 06, 2018 9:45 am
The plans show the jig for and bow mold for the standard version. See the note on drawing A284/5: Base version.

The strong back dimensions are for the Base version. For the LS version, it is very simple: all decks, fore and aft are in the same plane. That means that all the tops of all the frames are at the same level and can sit on a pair of 2x4's used as strongbacks.

The bow mold is the same for all versions, it does not matter if the mold sticks out in the LS version, it is just a mold. The bow mold is fastened to the first frame (A). In the LS version, that frame is in a different location: extend the bow mold to that frame. The frame locations for the LS version are on A284/6.
In the LS, frame A is at 36+36+36+36.
In the standard boat A is at 18+36+36+36+36.
= in the LS, frame A is 18" further back = extend the bow mold by 18".

Those who have the plans will understand why I use that weird notation, it matches the plans.

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Re: Fs17 LS jig question

Post by rbecker08 » Mon Jul 16, 2018 10:09 pm

jacquesmm wrote:
Fri Jul 06, 2018 9:45 am

The bow mold is the same for all versions, it does not matter if the mold sticks out in the LS version, it is just a mold. The bow mold is fastened to the first frame (A). In the LS version, that frame is in a different location: extend the bow mold to that frame. The frame locations for the LS version are on A284/6.
In the LS, frame A is at 36+36+36+36.
In the standard boat A is at 18+36+36+36+36.
= in the LS, frame A is 18" further back = extend the bow mold by 18".
Needing some help on this I am not getting the 18" to work out I am closer to 22"-24". The math doesn't seem to work out on the 14' jig for 18" either. Should I stretch the distance between Frame A and B or extend the distance to the start of the bow mold 4". Not a big deal but just confirming it doesn't cause problems. In addition I am using Drawing B284/9 where the notches are shown cut in the stringer for the frames to distance the frames.....there is no notch for frame A so maybe it is supposed to be further away.

Jig = 14*12 = 168"
Distance between frames = (36.125+36+36+36) = 144.125
Delta to front of jig = 168-144.25 = 23.875 (rough doesn't mess with Frame thickness)

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Re: Fs17 LS jig question

Post by jacquesmm » Thu Jul 19, 2018 2:57 pm

The shape of the bow, the shape of the bow mold, the curvature is the same but frame A is in a different location.
Put the frames in the correct location, install the bow mold and you will see that you need to add 18". Use a 2x4 or whatever is available.

But first get all those frames where they need to be for the LS version, the plans show it.

The length of the strongbacks is irrelevant. You don't need to do any math.
I will draw a sketch but I am too busy with a 3D model right now: I am drawing a round chine version for the LM18.
I"ll draw a sketch tomorrow.
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