Anyone interested in home-built sailing dinghies?

Anyone interested in home-built sailing dinghies?

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Discussion

dhutch

14,390 posts

198 months

Saturday 7th January 2023
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Nice work. Love the Jag!

jamieduff1981

Original Poster:

8,025 posts

141 months

Sunday 8th January 2023
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dhutch said:
Nice work. Love the Jag!
Thank you smile

This morning I sanded the mast round, cut it to final length and cut the tenon for the mast step. Obligatory vanity shots were required. It just fits, should I ever need or want to rig it indoors. Partially at least.




TarquinMX5

1,959 posts

81 months

Friday 20th January 2023
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Great progress, very impressive.

I suspect that we can all relate to projects that, despite the best intentions, stall to a varying degree and your delays back in the summer are perfectly understandable.

There's something very special about building something yourself and you can be proud of what you've achieved to date: when it's finished and looking beautiful, as only wood can, you can bask in self-satisfaction. Then, all you'll have to do is keep it looking good wink

Good luck with the Jag.

jamieduff1981

Original Poster:

8,025 posts

141 months

Sunday 5th February 2023
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Today I cut some wood into several smaller pieces of wood. Very useful huh? Actually today I made a good start on the foredeck. This is two halves of 6mm ply which wasn't too hard really. The overall task and much of today's sawdust, noise and time was spent making a consistent 6mm deep rebate into the hull planks for the deck to sit in flush with the gunwales, then fair off both of the bulkheads, batons and the big breasthook accordingly. It's all done now.









The deck could be glued down now leaving only final trimming of the aft edge which is close but I've deliberately left a couple of millimetres long for later. What I'm actually going to do next however is build the bowsprit, fabricate the bowsprit's fittings from stainless steel, and build out framing for a hatch either side of the batons to give access to the void between the bulkheads for some extra storage. I'll also be fitting some chunky hardwood back to back with the gunwale which I can mount some cleats too for tieing the boat up securely - one doesn't want those attached to 6mm plywood only! Once all that's done, then I'll glue the deck down with blind fittings to bolt down the bowsprit hardware to the breasthook.

dhutch

14,390 posts

198 months

Sunday 5th February 2023
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Looking good as always.

jamieduff1981

Original Poster:

8,025 posts

141 months

Saturday 11th February 2023
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I should have been making paint today but the paint machine is broken and we're awaiting a replacement part, so, dinghy it is!

It's been fairly productive and both daughters stayed off their phones/chromebooks etc to help.

First we cut out the blanks for the bowsprit from a rough sawn Douglas Fir board. This proved to be a lovely straight and close grained piece of wood once cleaned up. The diameter will eventually be 45mm for about half its length and tapered forward of this. Overall length is just shy of 2 metres. You'll have to imagine it round though because gluing it up is as far as this could go today.





It seemed a shame to waste the day (and the labour) though so we cut up another Iroko board and machined up 25mm square strips for the inner rails. The board isn't/wasn't long enough for the whole length of the boat so these will need spliced in. Obviously I had to mark out and cut corresponding notches out of the bulkheads to let these in. Overall it went smoothly.





To make the splice less visible and also where the strength these parts bring is less needed (i.e. the open cockpit area) I'm placing them forward. Without resorting to steam I realised after a few trials that I wasn't going to be able to bend the forward lengths in without breaking something.



Instead I whizzed the short forward bits through the bandsaw and the resulting two strips half the thickness bend into place easily.



I still need to cut the splice out of the long piece on the other side, and I need to trim the forward ends to fit the breast hook. Basically I'm done for the night though as I need the clamps which are on the bowsprit before I can epoxy all this in. It really is true that one can never have too many clamps. Unfortunately it's also true that one also never has enough money, so a line must be drawn somewhere and patience will supply the necessary clamps.

jamieduff1981

Original Poster:

8,025 posts

141 months

Sunday 12th February 2023
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Today we have a bowsprit. Well, not a functioning one. It's more a wooden stick really, but it's the right length, round and tapered like it's supposed to be. I think I'll make the mast partner next.




jamieduff1981

Original Poster:

8,025 posts

141 months

Sunday 12th February 2023
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I've made a start on the mast partner using Iroko. I've had a bit of a visit from the eff-up fairy though in that I managed to mis-remember the mast diameter between checking the plans and cutting a hole. The mast is 75mm, and the hole is only 70mm. Not the end of the world but I've made more work for myself...


dhutch

14,390 posts

198 months

Sunday 12th February 2023
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As always, tremendous progress and good work well done.

Makes perfect sense have a splice and two thinner strips on the inside of the bow locker, as said you will never know or see it!

I would love to have the amount of covered space you havezl, and if I had it I would have a band saw! Might even get the time and energy needed to use it occasionally.

jamieduff1981

Original Poster:

8,025 posts

141 months

Monday 13th February 2023
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dhutch said:
As always, tremendous progress and good work well done.

Makes perfect sense have a splice and two thinner strips on the inside of the bow locker, as said you will never know or see it!

I would love to have the amount of covered space you havezl, and if I had it I would have a band saw! Might even get the time and energy needed to use it occasionally.
It is really good to have it actually, and indeed was one of the things my wife and I agreed was a key feature when house shopping back in 2013/2014. We didn't actually have too many requirements other than enough bedrooms, a bit of character, space around us without curtain twitchers and an outbuilding of sorts for all my indulgences.

That said, I'm sure I'm getting softer with age as I still resent having to do jobs on the cars when I'm not in the mood citing cold and damp as reasons not to do them. I used to have to do them outside on a stone driveway! Now I find myself wishing it was all insulated and heated. So much for having some self respect!

jamieduff1981

Original Poster:

8,025 posts

141 months

Thursday 13th April 2023
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Another chunk of time has flown by but I haven't been entirely idle (although admittedly rather consumed by work).

My younger daughter loves making and editing videos, mostly related to Minecraft and Roblox gaming popular with her age group but I persuaded her to make a short on showing the sanding tool we made for final rounding of the spars. I marvel at what kids can do and what tools are available to do it these days, speaking as a 42 year old who was fairly tech-savvy himself at a similar age. That it can all be done by an 11 year old on a smart phone is amazing really.



So that's that.

I'm going on my sail making course later this month which I'm really looking forward to. I'm already fairly comfortable with the theory, maths and design aspect but expect I'll be worse than useless with the sewing machine. The good news is my wife is coming on the course too and she's quite a proficient amateur seamstress who churns out handbags, jackets, dresses, T-shirts, jumpers, trousers and dresses on a whim over a weekend between all the Parents Taxi service duties. Between us, we should have the skills to make and maintain our more traditional type sails. We won't be competent to make the modern high-tech racing sails but we're not bothered about that.

We have chosen the nice clipper canvas material, are not having luff wires, and are having brass piston hanks for the two headsails attaching them to standing stays i.e. neither will be set flying. We'll be making the gaff ourselves at home. The staysail (the inner jib) is going to be cross cut and the jib (outer) is going to be mitre cut.

As I work towards turning the wooden poles into actual spars, the attachments for the rigging turned up yesterday albeit in kit form. Behold some stainless steel flat and round bar. I've got a new reel of 316 welding wire and already have argon gas down in the garage too. I can mig weld mild steel alright but have never welded stainless before so I'll sacrifice a few small bits to practise on before going for the actual fittings.



I have, off the top of my head, the following metal fittings to make:

2 x Chain Plates (cut only)
3 x Fittings for the bowsprit (bent and welded)
1 x Strap for the boom gooseneck (bent and welded)
Maybe 1 x fitting for the top of the mast to assist attaching the forestays (bent and welded)
1 x horse for the boom sheet traveller over the tiller (bent and welded)
2 x rudder pintle modifications to suit my bigger headstock (bent and welded)
1 x Fitting for the bobstay attachment to the stem (cut only)

In addition, I've been trying to find the shroud partners inside two chunky blocks of Douglas Fir I had to glue up. These are close enough now that I know they'll be successful - they just need final opening out to perfectly fit the mast taper at the height they attach at and final hand finishing. After that they'll be glued on and the mast is ready for varnishing, which is quite exciting really!







I've just whilst typing this had notification that another package is arriving this afternoon which has my stainless steel deck cleats, most of the pulley blocks, enough 3mm 7x7 stainless steel cable, swage sleeves etc and turn buckles to make the standing rigging and fully finish the mast and bowsprit off. I'm feeling quite motivated to press on now as it feels like it's going to start to turn into a functioning boat soon rather than a 16ft long garden planter.

Alas, I am compelled to work to pay the bills though...

Edited by jamieduff1981 on Thursday 13th April 09:27


Edited by jamieduff1981 on Thursday 13th April 09:30

jamieduff1981

Original Poster:

8,025 posts

141 months

Friday 14th April 2023
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A pile of components arrived:



Meanwhile I got the shroud partners glued on to the mast and since it's not raining today I decided to pull the boat out of my shed and try the mast in the mast partner now that it's been sanded down to final diameter.

Obviously, since my wife and I are both proud to be rather childish at heart, it was then necessary to sit in the boat to make boaty-equivalent of broom-broom noises.







There's actually more glue curing on the boat and I think I'll pop out and glue up a few more joints. I will then be in a position to flip the boat over again, glue on the remaining two hardwood strakes either side of the daggerboard slot, fair up the hull and paint it.

Clearly I have some metalwork fabrication in my near future too now.

jamieduff1981

Original Poster:

8,025 posts

141 months

Friday 14th April 2023
quotequote all
Stainless steel isn't fun to work with, but I've made the chain plates.

As someone more used to mild steel and aluminium, the first signs of trouble were punching the hole centres to help stop the drill bit going for a walk. Normally a sharp whack with a hammer will make a nice indentation. On 316 stainless a tiny mark is achieved and after 8 punches I need to grind a new point on my punch!





Stainless steel likes to create really sharp and nasty burrs so to avoid bleeding I've been deburring as I go from one stage to the next. My hands aren't as tough as every-day manual workers might be but I do a lot of work with my hands and generally am not easily sliced by metal edges, but equally I'm not a complete fool and there's no reward to taking risks here.



It's toasted my HSS drill bits so I've got some Cobalts on order. I have a drill sharpener but after sharpening these won't cut stainless at all so they're relegated to drilling holes in wood. That's ok. One can never have too many drill bits...



They still need to be polished up, but here is a chain plate. The 3 mounting holes still need opened out to 5mm (5mm drill bit was smoked drilling the other one) to bolt through the hull, whilst the turnbuckle's clevis pin goes through a 6mm hole. The plate has a bend above the gunwale to reverse its angle off vertical to point the turnbuckle towards the top of the mast. For rigging and de-rigging for road transport the clevis pin pulls out. Easy peasy.



At the top of the mast, the shrounds will be swaged into loops, passed over the top of the mast and guided by the partners down towards the turnbuckles something like this, if you'll excuse the roughness of a quick sketch:


jamieduff1981

Original Poster:

8,025 posts

141 months

Tuesday 18th April 2023
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I made a start over the weekend at forming one of the brackets I'll use to hold the bowsprit and forestays. This will sit on the forepeak above the stem and will bolt through the breast hook.

I thought I'd try bending the 40mm x 3mm stainless steel flat bar in a wooden form using the hydraulic press in my garage I use for suspension bushes and wheel bearings etc. It's amazing how many times this thing has paid for itself in avoiding paying garages, particularly given the logistical hassle of getting from my house with a broken car to a garage and back again, then reverse when it's finished and ready to collect!



That looked promising but I underestimated how stiff the steel was whilst overestimating the strength of iroko.



I tried again using a beefier form.



This worked. It's a loose fit - there's about 2.5mm all round, but I plan on leathering the bowsprit here so it doesn't rattle or clunk around, and can always wedge if I need to.



Once the Cobalt drills are here and I can finish drilling the holes, this bit will be welded on like so and the forestay and attachment for the staysail's clew will go here.


dukeboy749r

2,672 posts

211 months

Tuesday 18th April 2023
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Very impressive!

OutInTheShed

7,666 posts

27 months

Tuesday 18th April 2023
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Stainless is funny stuff.

Sometimes it's easy to drill with normal HSS bits.

Other times carbide is the answer.

jamieduff1981

Original Poster:

8,025 posts

141 months

Wednesday 19th April 2023
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dukeboy749r said:
Very impressive!
Thanks for looking in biggrin

OutInTheShed said:
Stainless is funny stuff.

Sometimes it's easy to drill with normal HSS bits.

Other times carbide is the answer.
Yes I think the inconsistency is quite unnerving actually!


Last night I did my first stainless steel weld. I had planned to practise on scraps first but forgot. It's just a mig weld and the settings I guessed at worked out fine actually.





After a very cursory clean up it looks like it will be an acceptable part after proper clean up and some polishing.



I also got the mast partner glued and screwed in permanently which is another step forward.


B'stard Child

28,444 posts

247 months

Friday 21st April 2023
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jamieduff1981 said:
Last night I did my first stainless steel weld. I had planned to practise on scraps first but forgot. It's just a mig weld and the settings I guessed at worked out fine actually.



What wire/gas were you using - If I had a steel/steel with argoshield light that looked like that I'd have said I'd forgotten to turn the gas on

I'll happily weld SS with normal mild steel welding wire and argoshield light - I know it will just rust where the weld is wink

jamieduff1981

Original Poster:

8,025 posts

141 months

Friday 21st April 2023
quotequote all
B'stard Child said:
What wire/gas were you using - If I had a steel/steel with argoshield light that looked like that I'd have said I'd forgotten to turn the gas on

I'll happily weld SS with normal mild steel welding wire and argoshield light - I know it will just rust where the weld is wink
Hi! Yeah it did look a bit dirty but it cleaned up rather nicely. I used 316LSI stainless steel mig welding wire, and my gas is 80something% argon and CO2 mix which I'd read online should work ok with it. It's possible the bottle is a bit low - I've done a fair bit on my MX-5 with it already. I have 2 others here fresh so will change it over and see what happens on the next fitting smile

jamieduff1981

Original Poster:

8,025 posts

141 months

Monday 1st May 2023
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I spent last week in Stromness on a traditional sail making course run by the Orkney Maritime College. It was a really great 5 days. There was online work to do beforehand, but I had since New Year to do it.

We used the two headsails for my dinghy as the course project, and the 6 (and a half) of us split into two groups with me in one and my wife in the other.

Whilst my wife is already a pretty competent sewing machinist who makes all her own bags and clothes and made the costumes for our daughters' dance school's show last year, I have never sewn anything since making a stripy fish out of felt in home economics class in school, and generally have no aptitude for materials which aren't rigid. My first attempt on the big clutch-controlled industrial sewing machine went really badly which reinforced my conviction that I was really going to struggle with this.



Fortunately? it turned out the machine was damaged and nobody else did any better so we all ended up using servo-motor machines instead, where I gradually realised I could infact sew in a reasonably straight line if I practised a little.



My group worked on the staysail using a cross-cut design. Here we've reduced the sail plan dimensions to allow for stretch, have lofted the reduced dimensions out onto the floor and are calculating and pinning draught points and edge curves.



I am quite fussy in a sensory sense and whilst I respect Dacron's ubiquity, I hate how it feels and sounds. I chose Clipper Canvas instead. It's still a synthetic fibre and is hot rolled and resin coated so it's nice and airtight like Dacron but very quickly feels (and sounds) like old fashioned cotton canvas, but is much more stable than cotton canvas whilst having a bit more bias elongation (i.e. diagonal stretch) than Dacron. The Clipper Canvas came in 150cm widths, but on sails the size of those on my dinghy that is far too wide and leaves limited scope for shaping the sails. Hence, we slit the cloth into 50cm widths. Here we are laying out the cloth.



Broadseams were calculated and marked on in hard pencil next. This is the tack seam which gets a double allowance. The rest were half or less as severe. After the photo the panel above was taped in position with its edge following the pencil line, and the sail no longer sits flat on the floor.



Likewise the leech tapers were calculated, marked then taped.



We designed our corner patches, cut and positioned these for sewing.



Meanwhile, the other team was doing likewise on our jib, but we decided to go for a mitre cut for that sail so we could learn more overall.



We lifted the sail off the floor at that point to check the curvature in 3 dimensions, made a couple of very small adjustments then sewed the panels together. This done, we then moved onto marking our edge curves with a baton, trimming then folding our edge seams.



Now the edges and patches were ready for sewing.



This took us to the end of Day 2. On Day 3, we took time out from our sails to learn about assessing existing sails for repairs, and did some repairs for a local chap with a nice Shetland Model with a 4 sided lugsail.



On Wednesday night, we worked until 10pm learning traditional hand sewing and rope work techniques which was fun.



Pt3
I learned how to make a sailmaker's eye splice





We all agreed to abandon the staysail at this point, which my wife and I plan to finish with traditional bolt roping and handsewn eyelets and cringles. There simply wouldn't be time to do this on the course. Instead, we all focused on completing the jib using slightly more contemporary methods. This involved pre-tensioning a luff rope, splicing in thimbles, then sewing it in.



Once finished, we test flew out jib on the course leader's 23ft boat. The stay is a bit too upright for this sail and the sheet angle wrong so I'm pushing the sheet down a bit here to get a better idea of the sail. We're quite happy with it.



We each got nice little certificates to say we finished the course.



...and waved goodbye to the Orkney isles. This is the third time we've been there, and I'm sure we'll end up back there again some time.



Thanks for reading smile