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8th May 2012, 07:20 PM #121SENIOR MEMBER
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Yes, it is my boat and it was built last year during the period May - October.
I finished her too late in the season to try her out and I have just finished the final part (rudder stock) and varnishing this and the foils. The boat was painted/varnished last year during September/October, which is good as it gives the paint a chance to set well and get rock hard. Varnish is Epifanes one part; white paint is Sikkens one part.
I did hardly blog the construction (I will check later today whether I have any worthwhile photos). I do have the building instructions for the Dabchick and the construction is quite similar albeit a bit more sophisticated for the Chickadee.
This boat was indeed targetted at kids two-up sailing rathern than one up to fill the gap between the Opti and the 420. From your write up I take it that I will have fun as well sailing it in stronger winds: it is basically an evolved Dabchick on steroids.
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8th May 2012, 07:41 PM #122SENIOR MEMBER
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The Dabchicks rigging is of course a bit more complex than for my GIS which offers sophisticated simplicity.
GIS:
- one halyard
- downhaul
- mainsheet
- traveller
Dabchick:
- 3 stays
- two halyards
- mainsheet
- 2 jib sheets
- downhaul to tension the forestay on the jib
- kicker (operated from the mast)
- outhaul (operated from both sides of the boat)
- cunningham (operated from both sides of the boat)
- bridle for the mainsheet
MIK's Litte Sexy Daysailer (LSD??? ):
- kicker
- outhaul
- cunningham
- mainsheet
- bridle for the mainsheet
Questionmarks of course. How would a box mast go with a Laser like luff (it is on the drawings for the GIS...). Boom perhaps a T shape. Both would be relatively easy to make. And didn't Herreshoff say that box masts are more efficient?
Sail: a modern shape will battens supporting an extended roach. Perhaps to be produced centrally to keep costs down.
The OZ-racer / GIS foils go a long way and I don't think it is worthwhile to try to better these.
Very much looking foward to MIK's first sketches!
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11th May 2012, 06:16 PM #123
Good reading on the Herreshoff, but he was wrong. I think his argument was that the mast could be a bit smaller or have less visible cross section relative to the apparent wind.
The Square masts lose a bit of efficiency ... but gosh it's easier to build a reasonably light mast that way compared to the alternatives.
MIK
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11th May 2012, 06:52 PM #124SENIOR MEMBER
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The alternatives I can think of:
- aluminum mast (as per the discussion above concerning Laser parts)
- carbon mast (this will be by far the most expensive option)
- bird's mouth wooden mast (one must have access however to either a good table circular saw or a table router, I for example own neither)
If going for the wooden option, it should be possible of course to offer two alternatives (box mast + bird's mouth constructed round mast). Weights would be in the same range I think.
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11th May 2012, 09:30 PM #125
There might be another alternative you haven't seen yet ... hehe
And it is waaaay more sexy.
MIK
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11th May 2012, 11:05 PM #126SENIOR MEMBER
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Getting very curious here!
How long are you going to keep us in suspension?
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11th May 2012, 11:29 PM #127
As long as I want to.
But i had better get some info together in the next few weeks. It's possible that nobody will like it at all.
I am still trying to work out how to make it reasonably cheap despite some high techy aspects.
MIK
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11th May 2012, 11:51 PM #128Member
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- Sep 2008
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- Uppsala Sweden
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- 71
hollow wood spar
This lugsail yard was made from 4 x 1/4-round ceiling corner moldings from a big store. Glued pairs together, then a layer of glass tape inside as I had it, then glued the halves together and the two quarter-round strips to give it a better shape, and the 12mm OD aluminium tube as a track for slugs on the sail. Cut a slot for the track with table saw. Then covered the whole thing with a fibreglass sleeve to make it a smooth oval shape. It is pretty stiff, but bends enough with the downhaul to flatten the sail. You could simplify it by using only the 4 ceiling corner mouldings. I made my mast the same way with larger mouldings. They made an 8 sided shape, easily planed to 16 sides and rounded. The mast was covered with 3 layers of carbon sleeves and a protective layer of a light glass sleeve (all from Soller Composites in the US).
Peter
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12th May 2012, 04:43 AM #129SENIOR MEMBER
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12th May 2012, 08:25 AM #130SENIOR MEMBER
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One more rig alternative I can think of is one combining the mast and the sail in one: a wing mast or, taking it even further, a rigid wing sail rig....
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12th May 2012, 09:35 AM #131
Hi Joost,
There is not much more complication to go two piece with the wing, and using reasonably lo-tech materials like has been done with this Sunfish. Much more efficient. You don't really need carbon.
Attachment 208087
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12th May 2012, 09:51 AM #132
Another way of making a spar is using Andrew Linn's faux birdsmouth method and epoxy for the glue because it is gap filling. The advantage of the faux birdmouth method is that you can use cheap 1/4 inch material and if you don't have a table saw, you can plane the angles.
Faux Birds Mouth Mast - by Andrew Linn
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13th May 2012, 03:32 PM #133
Howdy,
While I like the ingenuity of Andrew's mast I don't like it so much because it isn't tapered. Too much weight at the ends and also it doesn't look right.
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13th May 2012, 03:39 PM #134
But I'll give you a hint of what I'm thinking about the rig.
Concrete Slab Insulation - Woodwork Forums
Frank fathered the development of modern Australian style hulls and very sophisticated rigs.
There were lots of people helping with the feedback and development cycles but certainly he was amongst the instigators and also certainly the one who worked most consistently.
Most of his advances were achieved with wood and string .. and maybe a bit of wire.
Later they got caught up in the whole high tech thing. But all the advances ... as is my hobby horse ... is that EVERY major development in sailing performance has nothing to do with materials.
The METHODS led to jumps in efficiency of 5 or 10 or 15%.
Materials, on the other hand have been responsible for a tiny percentage (maybe about 2%?) of performance but also for the 400 to 1200% price blowout for conventional sailing dinghies and catamarans.
MIK
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13th May 2012, 09:01 PM #135
A foam insulated concrete mast...
Or a cork covered one...
(Ok... I'm not very good at hints ! )
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