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 Plank on frame help

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AlanP
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PostSubject: Plank on frame help   Plank on frame help EmptyMon May 27, 2019 4:49 pm

Hi All, Back to building a boat (I hope) after building the Shrimper (on this site)quite awhile ago now, I fancied something similar, so I have gone for the M Y Scarbh free plans in MB Oct 2009.
All has gone well until I dry fitted the frames onto the keel on the building board. From the bow frames 15 to frame 8 (8 been the centre frame) are looking alright, but frames 7 to 1 I can see the deck line is too high,  I think this might be called the sheer line, not sure though, but its where the deck will sit.
I have given myself a bad head trying to figure out what I have done wrong, the drawing shows a line down the centre of the keel with frames 7 to 1 shown on the left , with the keel been lower on this side.
I know there are some clever people on this site so I am hoping someone will say, you silly old sod, you should have done this Very Happy

Plank on frame help Dscf4016
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barriew
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PostSubject: Re: Plank on frame help   Plank on frame help EmptyMon May 27, 2019 6:17 pm

Alan,

I'm no expert. All my POF builds have been from kits not plans, but I assumed that one side view was from the bow, the other from the stern.
Not sure if this helps Rolling Eyes 

Barrie
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AlanP
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PostSubject: Re: Plank on frame help   Plank on frame help EmptyMon May 27, 2019 7:43 pm

Thanks for the reply Barrie but I cant see how that would make any difference, perhaps I am still missing something that is obvious, but thanks anyway.

Alan
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Roadrunner
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PostSubject: Re: Plank on frame help   Plank on frame help EmptyMon May 27, 2019 8:13 pm

Do I have the keel (side view of the plan?) the keel in the photo showing bow and bulkhead s has the aft sections on a lower keel position ( usually a raise) which might be the source of the issue.... as the tops of the bulwarks are different heights as the bulkhead progress front to stern meaning their heights in a base board must be correct... ( in other words I think at a rough guess all your bulkheads are at the same heigh giving u and incorrect sweep

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AlanP
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PostSubject: Re: Plank on frame help   Plank on frame help EmptyTue May 28, 2019 5:15 pm

Thanks for the reply Roadrunner, please forgive me for been so thick, but I am still struggling to get my head around this. I think the aft bulkhead legs that go onto the building board are to long by 5mm, as I used the same building board line (shown as a pencil line on the drawing) so if I take 5mm off all of the aft bulkhead building board legs this would make the deck line about right, but the only trouble I can see with this fix is that the planking line at the keel would alter, the rabbet line does not appear to be shown on the drawing. I will understand if you want to wash your hands of this thread Sad

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Roadrunner
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PostSubject: Re: Plank on frame help   Plank on frame help EmptyWed May 29, 2019 3:13 pm

It doesn’t look that far off however I do believe a few of the bulkheads are either to long or to short which is giving you the drastic drop offs at deck level, my only suggestion is to pull each frame off and check and recheck their heights in regard to the plan and location...

Also decks will be very shallow curvatures so any sudden drop off ( that is not an official raised deck section) needs to be investigated

It’s very hard to judge but this dose look like a few of the bulkheads are either in the wrong position or just the wrong height.

Without being their to take measurements and scale conversion ( if nearsary) then I can only suggest to recheck over and over... as a suggestion in future make up cardboard templates first like I do... only takes some scissors and tape to fix and error!

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AlanP
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PostSubject: Re: Plank on frame help   Plank on frame help EmptyWed May 29, 2019 3:27 pm

Thanks for your prompt reply, I will take your advice, so its back to the drawing board and check everything, if I can source some cardboard I might make a set of bulkheads to have a play with.

Thanks again.
Alan
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stavros
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PostSubject: Re: Plank on frame help   Plank on frame help EmptyWed May 29, 2019 10:16 pm

Had a very similar problem with a Raf boat I am building a couple of the bulkhead slots seemed out of line so I asked Nel to have a look and he had megga trouble in making new ones nad getting all the stringers to fall in line with each other,,,,,if this makes sense,the plan was slightly out.....Maybee this could be the case with yours

Dave
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AlanP
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PostSubject: Re: Plank on frame help   Plank on frame help EmptyThu May 30, 2019 4:35 pm

You could be right Dave, but I think it is something to do with the legs going onto the building board, I have traced all the frames to the same building board line, and for some reason that I haven't figured out yet, this is wrong.
If I remember right, I had the same trouble with a RAF crash tender, but I must have sorted it as it won all the silver at a show.

Alan
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basilsdad
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PostSubject: frames   Plank on frame help EmptyMon Jun 03, 2019 4:42 pm

hi Alan I have built a few plank on frame boats from scratch and in my limited opinion I think you have frame 2onwards in the wrong place they appear to far down the keel to me?. the drawing looks to have frame 2 level with the propeller tube and the rest follow from that. easy fix just add blocks to the bottom of the frames to lift and I think this will solve your problem?

mauricew
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AlanP
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PostSubject: Re: Plank on frame help   Plank on frame help EmptyMon Jun 10, 2019 3:49 pm

Thanks for the reply basilsdad, I have been away in Sewerby near Bridlington and for some unknown reason my laptop wouldn't connect to the internet, hence the delay in replying.
Back home now and once I have sorted the allotment out I will give the boat a good coat of looking at.

Thanks again for your thoughts.

Alan
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