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iGRF View Drop Down
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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Topic: Winter Projects
    Posted: 26 Nov 14 at 8:55am
I like that bow, it has logical application, =more waterline length for less weight, it will certainly be a feature of my new craft same at the stern, too much deck weight was one of my V twin problems.


So a quick question what CAD packages do you tend to use, then the next question are there any that run on a MAC.



Edited by iGRF - 26 Nov 14 at 8:58am
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Medway Maniac View Drop Down
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Post Options Post Options   Quote Medway Maniac Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 14 at 9:11am
Originally posted by Rupert

I guess that unlike the long, slim keelboats (like the 22sqm and friends) this boat is designed to be sailed dead upright, so you not only need the static waterline length but also the ability to go through the waves, hence the bow.


Also, I guess nose-diving should be less of an issue on a boat of that length with a relatively low rig, so a lot of reserve buoyancy above the waterline is not required.
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 14 at 9:20am
The reason I don't like the reverse bows on dinghies is that the deeper the bow goes the blunder the sections get, which you'd think would increase tripping. In a really narrow hull like a catamaran it's irrelevant. With something short and wide it seems a v big deal. This is somewhere between.
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Post Options Post Options   Quote ChrisB14 Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 14 at 10:34am
Originally posted by iGRF

So a quick question what CAD packages do you tend to use, then the next question are there any that run on a MAC.

Not a huge selection on Macs.

There is Vector Works (strong architectural emphasis, but available in different versions):
http://www.vectorworks.net/

AutoCAD:
http://www.autodesk.com/products/autocad/overview

Rhino 3D is currently being ported to Macs with a free beta version available:
http://www.rhino3d.com/download/wenatchee/5.0/wip

I don't know of any people who have tried the likes of iCADMac.

Of course nothing beats a proper old school technical drawing and construction station ;-)
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In build: Farr 3.7 GBR 410 (both sail number and the current number of loose parts)
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iGRF View Drop Down
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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 14 at 12:05pm
Thanks Chris, I note your building a Farr, how is that going, I did wonder if I should commence on something already planned rather than plunge headlong into something I have totally no experience of (like last time) and hope it'll be alright on the night.
Other than Marine Ply and the Gaboon thing I've no idea what wood should be selected for say the keels or the runners that the ply gets nailed to (is it nailed or glued) why does every boat self build seem to be festooned with G clamps is that part of cold moulding the ply around a former, (Can't they just power staple them).

I shall give that rhino download a look, running stuff like that through Parallels is slow.

Can you believe I burned a bloody technical drawing board when we moved house and left loads of timber behind.
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iGRF View Drop Down
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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 14 at 12:08pm
Originally posted by JimC

The reason I don't like the reverse bows on dinghies is that the deeper the bow goes the blunder the sections get, which you'd think would increase tripping. In a really narrow hull like a catamaran it's irrelevant. With something short and wide it seems a v big deal. This is somewhere between.


Anyone ever used a bow plane to counter nose dives?
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Post Options Post Options   Quote PeterG Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 14 at 12:28pm
Originally posted by iGRF

Thanks Chris, I note your building a Farr, how is that going, I did wonder if I should commence on something already planned rather than plunge headlong into something I have totally no experience of (like last time) and hope it'll be alright on the night.
Other than Marine Ply and the Gaboon thing I've no idea what wood should be selected for say the keels or the runners that the ply gets nailed to (is it nailed or glued) why does every boat self build seem to be festooned with G clamps is that part of cold moulding the ply around a former, (Can't they just power staple them).

This is what you are looking for




Edited by PeterG - 26 Nov 14 at 12:30pm
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Rupert View Drop Down
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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 14 at 12:44pm
Something like that, but for a boat designed in the last 5 years, not the last 50?
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JimC View Drop Down
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 14 at 1:02pm
Originally posted by iGRF

Anyone ever used a bow plane to counter nose dives?

Yeah its been done. On boats with spinnakers it ends in tears...
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ChrisB14 View Drop Down
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Post Options Post Options   Quote ChrisB14 Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 14 at 1:30pm
Originally posted by iGRF

Thanks Chris, I note your building a Farr, how is that going, I did wonder if I should commence on something already planned rather than plunge headlong into something I have totally no experience of (like last time) and hope it'll be alright on the night.


While our progress is slow (it was never intended to be a sprint to the finished boat), I must say that I rather like the Farr build. While not a kit, it does get close: the relevant frames are all contained in a CAD file from the class organization, so CNC cutting them is easy. The building instructions left me with a few questions, but finding answers to those proved easy enough, as many Farrs are DIYs.

Originally posted by iGRF

Other than Marine Ply and the Gaboon thing I've no idea what wood should be selected for say the keels or the runners that the ply gets nailed to (is it nailed or glued) why does every boat self build seem to be festooned with G clamps is that part of cold moulding the ply around a former, (Can't they just power staple them).
For stringers, etc. we went with western red cedar. Very light and stiff. Some people use sitika spruce. Always glue, never nail. Epoxy is a godsend.

And yes: you can never have enough clamps ;)

Originally posted by iGRF

Can you believe I burned a bloody technical drawing board when we moved house and left loads of timber behind.

Nooo! Say it ain't so! 

I gave mine to a neighbor's kid who needed it for school. Sigh.

B14 GBR 748 Bullet B
In build: Farr 3.7 GBR 410 (both sail number and the current number of loose parts)
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