Boat in a box - the Shu3

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Shu
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Boat in a box - the Shu3

Post by Shu » Mon Jan 13, 2014 9:20 pm

It's been nearly 2 years since the Shu2 was launched, and I'm itching to do some boat building. Consequently, while I was helping out with the Skiff Clinic in San Diego this Saturday, this box arrived at my front door:
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IMG_2922.JPG
A very nice Christmas gift to myself, even if it is a bit late. What's inside?
Steve Shumaker
USA 1183

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rand
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Re: Boat in a box - the Shu3

Post by rand » Mon Jan 13, 2014 10:01 pm

Open it up! :D
Rand Arnold
International 14 USA 1143
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(former US President, former US Measurer)

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Re: Boat in a box - the Shu3

Post by Pirate » Mon Jan 13, 2014 11:15 pm

Laser cut stations!

What's different? Slightly bulbious bow?

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Re: Boat in a box - the Shu3

Post by Shu » Mon Jan 13, 2014 11:57 pm

%#$@&*!
I timed out on my last post and lost it all!
Stay tuned...
Steve Shumaker
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Re: Boat in a box - the Shu3

Post by Shu » Tue Jan 14, 2014 12:07 am

A box full of boat!

The frames and girders were CNC routed from 6mm BS1088 Okoume plywood by Brandon and Jessica at Turn Point Design in Port Townsend, Washington. All I did was send them (along with some money) a Rhino.3dm file of the frames and girders laid out on two 4'x8' sheets, and they did the rest.

About a month ago I received 4 sheets of 2mm and 4 sheets of 4mm Okoume plywood from John Gray at Homestead Hardwoods in Ohio. These are also manufactured to the BS1088 standard for marine plywood. These along with some leftover carbon and epoxy, and all the Port Orford cedar I could ever need for stringers will get me started.
Attachments
IMG_2928.JPG
A box full of Frames and Girders, this time with the lightening holes pre-cut.
IMG_2926.JPG
Aft Frames
IMG_2925.JPG
Forward Frames
Steve Shumaker
USA 1183

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Re: Boat in a box - the Shu3

Post by Shu » Tue Jan 14, 2014 12:38 am

The design will continue recent trends in I-14 design. It has very, very little rocker, rounded bow sections, and a high prismatic coefficient, Cp. For those unfamiliar, Cp measures the relative fullness of the forward and aft sections relative to the midships section. A displacement keelboat has a low Cp, a planing powerboat has a high Cp. This boat's Cp is approaching that of a powerboat, but it retains a relatively fine entry angle to facilitate light air performance. I tried to maintain as fine an entry angle as possible at the chine for bow-down light air trim. There is some hollow in the topsides forward. This together with a trim piece at the gunwale, will direct some of the water away from the inside of the boat in big conditions. I've maintained the Shu2's approx. 12-degree flare to the topsides. This is consistent with the flare on the B5, and provides a wide enough staying base to allow the shrouds to be fastened directly to the hull if desired. It also gives a little bit more ultimate stability* than vertical topsides as found on Gui's Mad Cow and the B6. Even so, it will be a slightly tipier boat than the Shu2, and certainly less stable than the venerable B2.

Unlike the Shu2, the Shu3's chine is a straight line in profile. Although I'm intrigued by the possibilities of the slightly bulbous bow Paul Bieker incorporated into the B6, I have kept with a traditional sharp entry, rounded enough to provide strength.

*One sense of ultimate stability is the angle beyond which a boat capsizes and inverts. It's a bit silly to think of this for a 14, since an actual calculated angle of ultimate stability is probably close to zero; after all, they capsize at the dock. However, the activity of the crew keeps the boat upright. In reference to an I-14, this angle would be the point beyond which, in spite of crew heroics, the boat heels beyond the point of no return.
Steve Shumaker
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Shu
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Re: Boat in a box - the Shu3

Post by Shu » Tue Jan 14, 2014 12:56 am

The construction details will be similar to the Shu2, hence I will limit my posts. Extensive details of the Shu2's construction can be found on the "My New Boat" thread.

Inspired by the B6/H2 design, I've made the construction configuration simpler than the Shu2, to make the boat lighter and faster to build. It will have no spinnaker trough and no foredeck.

I will try to post a rendering of the hull soon.
Steve Shumaker
USA 1183

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Re: Boat in a box - the Shu3

Post by joe.bersch » Tue Jan 14, 2014 6:35 am

Spare no posts! Love watching your build and explanation, Steve. Give Hendo a run for his money on posts. Look forward to seeing more.

Joe

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Re: Boat in a box - the Shu3

Post by BWR » Tue Jan 14, 2014 6:44 am

Best of luck with this project Steve, look forward to watching the progress/ build.

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Re: Boat in a box - the Shu3

Post by EdS » Tue Jan 14, 2014 12:32 pm

Steve, great to hear about the new project, looking forward to learning some more!
Roaring Forties GBR1524

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Re: Boat in a box - the Shu3

Post by Pirate » Tue Jan 14, 2014 5:31 pm

I don't see any limber holes. Are you putting them in later? ( I assume the notches are for the stringers)

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Re: Boat in a box - the Shu3

Post by Chris Johnson » Wed Jan 15, 2014 6:36 pm

Wow! This is exciting! I knew you were thinking about a new design, but didn't realize it had gotten this far! I'm really looking forward to hearing about the progress as you go.

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Re: Boat in a box - the Shu3

Post by Shu » Wed Jan 15, 2014 10:41 pm

Chris,
Recovering from knee surgery in late October and early November, there wasn't a lot I could do. Sitting in front of my computer and going through the painstaking process of developing a set of fair lines that matched what was in my head was something I could do.

Joe, Rand, Ed, BWR
Thanks for the encouragement.

Pirate,
Keen observation there. I wanted to make sure the stringers were held firmly by the frames. Once they are securely epoxied into their slots, I will cut limber holes. It would be a bummer if I forgot.
-Steve
Steve Shumaker
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Shu
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Re: Boat in a box - the Shu3

Post by Shu » Fri Jan 17, 2014 1:41 am

Crud, my updated version of Rhino has an unrecognizable (to me) render utility. This could take a while.
Steve Shumaker
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Re: Boat in a box - the Shu3

Post by Shu » Sun Jan 19, 2014 3:20 am

I'm still struggling with the render utility in my design program, but these should give you an idea about the shape of the boat.
Attachments
D10render.jpg
D10render4.jpg
D10render1.jpg
D10render2.jpg
D10render3.jpg
Steve Shumaker
USA 1183

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