FB11 Prometheus

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PrometheusNL
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FB11 Prometheus

Post by PrometheusNL » Thu Aug 03, 2017 11:53 am

After a bit of a break im back at it building a FB11 nesting dingy.

had a bit of trouble starting my build because i wanted to scarf the panels but had no idea to accomplish this without having to sand a scarf joint.

So i started looking and came across a nice web tutorial and i figured id give it a go.
The jig worked like a charm and really fast i had my scarfs.
http://www.oneoceankayaks.com/stitchglu ... rfjig2.htm

Little bit of Glue and presto a day later i had an extra large panel :)

time to set out the plans on the wood.

Prom
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narfi
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Re: FB11 Prometheus

Post by narfi » Thu Aug 03, 2017 5:39 pm

is there any big advantage to this over fiberglass tape joints other than purity?
Or do different designs specify different types?

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PrometheusNL
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Re: FB11 Prometheus

Post by PrometheusNL » Fri Aug 04, 2017 3:57 am

I find it's stronger i tried 3 separate options

Butt block verry easy but you end up with a doubler and on this design it would be verry hard to get a nice result.

Routered Lap Joint was doable but hard to keep exact even with jigs and a router. And on the edges i found it was kinda flimsy.

scarf joint was my best option. I made the Jig and I cut with the circular saw and because i couldn't go full depth the last half inch i used a RO sander to get the smooth result. In lamination testing this gave the strongest best result and in the end with the jig was easyest to make. Wear eye ear and breather protection when making this joint cause sawdust "man glitter" gets everywhere.

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PrometheusNL
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Measure draw measure and do again until your sure.

Post by PrometheusNL » Fri Aug 04, 2017 3:58 am

So time to lay out all the drawings from paper to panels and draw and saw.

Boy this plywood is large when 2 sheets are glued together hard to handle but i can mange. Got myself a couple of rulers pencils and erasers and lets get cracking.

2 hours later everything was drawn on according to suggested sheet layout. One issue on the plans though i found that's the Bow piece needs to be rotated 90deg or it won't fit between the transom and bottom pannel 1.

Take your time and measure until you are sure you can only cut once. Glad i did because even though i measured twice the last time and final check i still found an error in my measurements on the transom.

as you can see i use the option on the plan just to laminate 2 sheets together because space is limited in my garage. The last lamination will just be 1 side panel with instead of the whole sheet.

Draw Saw rince and repeat.

I found cutting with a circlular saw does give nicer lines but alot more mess. And since i have a great jiggsaw with a good blade i'll stick to that. This will get you the occational 1 to 2 mm wobble across the line but that will be easally fixed with my RO sander.

2 2x4 underneath the sheets worked best blade din't hit the ground. Cut out mostly close to the line then move up on the workmate for final cutting.

about 4 to 5 hours of cutting and i was done.

Then i taped the backside of the scarf joints this was easyer then waiting a whole day for glue to dry.

Let's get ready to stich her up.
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PrometheusNL
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snitches get stiches

Post by PrometheusNL » Mon Aug 07, 2017 3:26 pm

Let's stich her up.

some pannels where verry hard to conform to the shape mostly used tiewraps but some places needed copper to twist the pannels together.

in the end got it to work.

Made it without a strongback but to work on her further i made some stands to have easyer access.

next up filets galore.
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terrulian
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Re: FB11 Prometheus

Post by terrulian » Mon Aug 07, 2017 3:43 pm

Great work. I've bookmarked the jig for later reference.

In Jacques' designs, it is my understanding that, at least in my plans, the butt joints are doubled where the frames meet the hull, thus spreading out the load at the frames and avoiding a hard spot.
Tony
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PrometheusNL
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Re: FB11 Prometheus

Post by PrometheusNL » Tue Aug 08, 2017 4:03 am

Hi,
terrulian wrote:
Mon Aug 07, 2017 3:43 pm
Great work. I've bookmarked the jig for later reference.

In Jacques' designs, it is my understanding that, at least in my plans, the butt joints are doubled where the frames meet the hull, thus spreading out the load at the frames and avoiding a hard spot.
I could not find the butt joint locations on the plans. Maybe i overlooked them. They do mention them but i'm almost positive there are no drawings to that extend.

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PrometheusNL
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stich and inside tape

Post by PrometheusNL » Sun Aug 13, 2017 6:22 am

let's get her stuck together. checked squareness i'm about half a Cm off. As AVE likes to say. Good enhough for the girls i go out with.

tape layed down pretty nicely got a good expoxy glass ratio not 50/50 but i'm comming close. No voids or dry spots so it's looking good.

Just the tip of my filleting tounge depressor and only for a second. Went pretty nicely.
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PrometheusNL
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Flip her on her back and round her over.

Post by PrometheusNL » Sun Aug 13, 2017 6:28 am

So inside looks good nice and strong tape adhered verry nicely.

So flipped her over and rounded all the chines etc with a good woodplane. GREAT for removing thickend epoxy quickly without alot of mess. Be carefull around wood edges though until you get the hang of it.

Got the idea from Tips from a shipwright on Youtubes. Get a woodplane works wonders on epoxy cured or a lil green good control possible.

Most of the roundover was planed then lil sanding to get the nice fairness got some thickend epoxy filled voids and drill holes and taped her up. First cut all the tape to size. Lesson learend give a lil extra length cause i was to sparse i almost din't have enhough.
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She loves it wet on wet.

Post by PrometheusNL » Sun Aug 13, 2017 7:22 am

After filling up the outside with thickend epoxy i straight proceded to lay the glass tape ontop.

This second build way quicker then the first boat i built because now all the stuff i learend from the first time just doing it now i plan my layups and tasks so that i can work around dry time and still get loads done.

Tape put down like a dream she's nice and wet and easally accepted the glass to confirm to her curves.

Layup was done with 4 inch 6 oz glass tape and a Mohair 4 inch roller wetted out like a dream way quicker then a bristle brush and with the length i needed a welcome timesaver.

double layer on the chine for abration protection.
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