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Author Topic: Laser cutting.  (Read 21085 times)

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Offline Torchy

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Re: Laser cutting.
« Reply #15 on: April 10, 2012, 09:19:44 PM »
Does anybody else build in carbon like this?

Clive...that is seriously impressive. How much did the cut carbon kit cost?

The Cherub shape is only a little more complex than the foiler - a bow/snout section to fit the bottom and side panels into?
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Offline Torchy

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Re: Laser cutting.
« Reply #16 on: April 10, 2012, 09:22:56 PM »
You probably already know but...canoe/kayak plans. I like the Chesapeake 17LT

http://www.clcboats.com/

http://www.clcboats.com/shop/boats/kayak-kits/chesapeake-17-lt-sea-kayak-kit.html
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Offline Clive Everest

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Re: Laser cutting.
« Reply #17 on: April 11, 2012, 11:36:22 AM »
I think that the complete cut carbon kit was ~£1300 inc shipping.
It seamed reasonable value for the time it saved esp considering it was a 1 off.
There are a lot more water jet cutters around now the rates may have gone down.
Fibrefusion have the press as well so offer the whole service, and more experience of cutting foam carbon panels.

Thanks for the link.

Clive
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Offline Torchy

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Re: Laser cutting.
« Reply #18 on: April 11, 2012, 07:38:45 PM »
That's actually a pretty good price
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Offline Phil Alderson

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Re: Laser cutting.
« Reply #19 on: April 12, 2012, 07:30:33 PM »
That looks like an interesting technique, the panels are bent more than I expected what was the thickness of foam used?

It gives me ideas, I am not sure I would build a Cherub like that though.



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Offline Torchy

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Re: Laser cutting.
« Reply #20 on: April 12, 2012, 08:53:33 PM »
I'm intrigued as to what Kevin Ellway would come up with as a CAD for an E6 kit and how much the kits would cost...bought in lots of 5 for instance

Double chine, single chine?

Some clever geazer come up with the (moulded) bow/snout section
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Offline john_hamilton

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Re: Laser cutting.
« Reply #21 on: April 12, 2012, 09:27:23 PM »
everything about the outer shell is curvy though, which could be problematic
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Offline Clive Everest

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Re: Laser cutting.
« Reply #22 on: April 13, 2012, 01:09:33 PM »
I used 8mm foam. I was happy bending it to 0.2% extension.
On a simple curve that gives a radius of 2m.
The same limit applies for compound curves.

Clive
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Offline john_hamilton

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Re: Laser cutting.
« Reply #23 on: April 13, 2012, 01:22:31 PM »
so a moulded bow section would be needed, but otherwise.... i think an E5 would be more suited to this than an E6 definately, the chines would make it easier
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Offline Torchy

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Re: Laser cutting.
« Reply #24 on: April 13, 2012, 01:59:21 PM »
That was my initial thought too John but I haven't seen an E5 close up.

I would like to see the 'cheap and easy to build by amateurs' ethos reclaimed.

There might be a natural progression for newcomers to the class:
* Buy an old-ish '97 Rules boat
* Sail for a season
* Build an E5/Banshee(?)/other hull (in pin and glue carbon), swap the rig over and still sail '97 Rules but be more competitive
* Sell the old '97 Rules boat, buy new '97 rig and make a bid for the '97 Rules trophy or buy '05 rig and move into twin-wiring

...or:
* Build new boat in carbon with '97 rig
* Sail for a while
* Add '05 sails and '97 rig becomes 'storm' suit

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Offline JimC

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Re: Laser cutting.
« Reply #25 on: April 13, 2012, 02:50:28 PM »
Trouble is that you add a fair bit of work and weight on the shell with all the stitching together and so on.

I was wondering about getting a pro to build the shell below the chines and gluing on flat panels above the chines, but couldn't convince myself it would save an awful lot of time in the pro's shop, and thus much money.  The other thing would be to do the bottom is say 4 or 5 planks each side and then flat topsides, but then you start thinking that really you should put a single skin over all the planks, and its not long before you might as well be building the shell on pre cut foam that has no skin at all - or maybe only on the inside.

Bare shell and flat pack interior ought to be a possibility though. heck, it ought to save time for pro built boats too. If I understand his thinking I could see this be something Roland might want to look into if the Arup skiff gets the nod - how many bare shells and flat pack interior sets could fit into a 20ft container for completion by a local boatbuilder? Shells, deck mouldings, flat pack interior frames, flat pack building frame, collection of carbon tubes... I'd hazard a guess that you'd get a year's production for a local builder or a viable fleet for a small nation in a single container.
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Offline john_hamilton

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Re: Laser cutting.
« Reply #26 on: April 13, 2012, 04:45:54 PM »
anyway nigel, they arent THAT hard to build for an idiot/teenager/noob to build anyway, mine hasnt fallen apart yet

the chines on e5 ^^
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Offline Torchy

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Re: Laser cutting.
« Reply #27 on: April 13, 2012, 05:50:50 PM »
John, it's the cost of the pre-moulded shell rather than the difficulty...my thinking is that pre-laminated carbon sheets on an industrial scale (now starting to happen?) cuts costs.

Carbon/foam sheets are the new plywood
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Offline Torchy

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Re: Laser cutting.
« Reply #28 on: April 13, 2012, 05:51:59 PM »
PS How is Nomad doing? That's an old pic, yes?
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Offline john_hamilton

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Re: Laser cutting.
« Reply #29 on: April 13, 2012, 06:42:15 PM »
its caled anatidae[hobia, nomad was too plain for a cherub

this is it on wed with me and digby
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cherub 2645 - cheese before bedtime
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