Jim Antrim designed scowbow with junk rig



In 1977, while living in the little yellow house by the River Vaipoiri, a different boat came to paper and then lived on as a dream.  

We had SEMINOLE anchored off the river mouth. She was a fine vessel, built with love and attention, cared for, and well sailed.  When we started her we were sailing savvy but naïve about the sea. There was only the library and words from other sailors for clues about voyaging and what worked well. We chose to build a ‘traditional’ design, from cheap plans in a magazine. The Atkin’s ‘Ingrid’ design would turn out to be wet and slow, and after sailing her for several years there were endless thoughts of how to do it another way, even to the point of threats to take an axe to the interior and start fresh.

Patrick Humbert was my friend though all of the adventure beyond the end of the road. We lived the barefoot vagabond life and dreamed of new boats. His own was lost on a Tuamotu reef so his madness was driven by being boatless.  We would spend lazy hours in deep discussion about making boats with the fewest moving parts, the simplest of everything, and even limited use of metal. West System was getting rolling around then and boats of laminated wood and epoxy were getting popular and easier to build. 

So we drew dreams of cargo space, deck living, shallow draft, up-the-river kind of craft. The junk rig was logical and would be cheap and could be repaired anywhere with just about anything you can find. There were asymmetrical lee-boards externally like Dutch canal boats. We even fantasized electric power or none at all. All a little crazy for 1977.

In 2014, an early sketch reminded me of all the reasons why Patrick and I had tripped out on the different concept. Lots of quick drawings evolved until the scale ruler and drafting sticks became necessary.  Lines and sections could be used to develop a design from a crude but experienced guess. We drew and erased and worked up to a scale that helped make it easier to visualize. When it looked real enough I called Jim Antrim because we had earlier meetings about other boat fantasies. He’s a patient fellow, and I knew there was no shying away from unusual design projects. Jim having designed Patrick’s TE MARAMA catamaran was a real connection also.

We found a fantastic guy, Cree Partridge, owner of Berkeley Marine Center, who was willing to build the Rosie G, and as of January 2019, molds are being made for the beginning process.  We'll keep you posted on her progress!

The brief:



Outside ballast, preferably cast lead for grounding

Modern junk rig with 200 lb carbon mast and engineered sail structure

Cockpit to galley/nav/dining same level feel. No ladders.

Forward flush deck

Scow bow 8’0” wide 2’0” back

Electric power

Large deck hatches

LOA 42’0”

Beam 14’0”

LWL 41’0”

Draft 4’0” (7’6” board down)

Displacement  20,000 lb

Ballast (cast lead) 7,500 lb

Sail Area 842 Sq Ft

  • ROSIE G will be easy to board from a dinghy or swimming. 
  • She will have a ‘junk’ rig with a tapered carbon mast that should be around two hundred pounds. 
  • The ballast keel is cast lead and will be able to be grounded and stand the boat. 
  • The cockpit and galley/nav/dinette are on the same level... no ladder... and the doghouse windows will open to make the space airy when cooking/eating/hanging about. 
  • Volume forward in the beamy shape creates a huge space (appox 13’ x 8’) that can have any choice for use, from light cargo to private cabins. 
  • A four foot square opening hatch opens the world outside when at anchor. 
  • The hull and structures have the finish of a good quality commercial fishing boat built on a male mold using CoreCel and glass/epoxy.  




Fifteen years ago,  a red cloud kelpie was born in Western Australia. Originally a desert dog, Rosie came to Maui, Hawaii when she was two in 2006.

She adapted to island life including sailing on SV Cornelia.  She quickly took ownership. Over the nine years we've had Cornelia, it was becoming more difficult for Rosie to get on and off and down below. 


Rosie wanted her own boat. And now she has her own blog to take you on her boat building journey.

She also wrote a book called Rosie's Perspective, Dog Only Knows. 

Just click on the button below to buy it!

Click here



Rosie was getting on, like all of us.  And like us, she wanted to get on and off easily, walk from the cockpit into her doghouse without climbing over anything, go "down below" in two easy steps.  

Rosie passed over the rainbow bridge Saturday, 18 May 2019,  the first day of her 16th year, but before she left us, she told us she would definitely be keeping an eye on the progress of her boat.

Rosie don't roll!

The Rosie G will be stable, go fast and be dry.  There won't be alot of wires to trip over on deck.  And it will be roomy inside, plenty of places to find comfortable cubbies to snuggle into for a nap.




 Is easy to board from a dinghy 

or swimming. 

The hull and structures have the finish of 

a good quality commercial fishing boat built on a male mold using CoreCel 

and glass/epoxy.  

Scow Bow provides a soft ride, dry decks, long straight waterlines, massive volume and high stability.  

To see the progress of the Rosie G, go to Rosie's blog.



The main (and only) sail is a ‘junk’ style.  The sail will be very light with round carbon tube battens, boom, and head spar. Modern spectra sheets and halyards and ‘soft’ construction details make the sail easily set with the single electric/manual winch.

Instead of woven jute or hemp panels, bamboo battens, solid wooden masts, and coco fiber lines there is a sail made from varied weights of Dacron material, battens made from windsurf masts of 100% carbon, a tapered carbon tube mast from GMT Composites with sheets, halyards, and control lines running in the lightest blocks and fittings. Spectra sheets and halyards and ‘soft’ construction details make the sail easily set with the single electric/manual winch.  It’s very winglike and controllable, lightly loaded, all sheeting from the leech, full twist control with low tension. 

The entire sail can be swung on the mast to ‘square it and balance the loading, thereby helping to balance the boat.

A junk rig has few parts and low loads.  It is uncomplicated and easy to fix anywhere, no rigging to fail, infinitely adjustable and makes totally aerodynamic sense if you understand all power comes from 

angle of attack.



The ballast keel, from MarsKeel

is 7405 lbs of pure cast lead with 

3% antimony and keel bolts are 

316 Grade Stainless Steel.  

The keel can be grounded 

and stand the boat.

The perfect grounding shoe.



The cockpit and the galley/nav/dinette are on the same level... no ladder... and the doghouse windows open to make the space airy when cooking, eating, 

and hanging about.

Volume forward in the beamy shape creates a huge space (appx 13’ x 8’) that can have any choice for use, from light cargo to private cabins. 

A four foot square opening hatch brings the outside world in when at anchor, and serves to load large items if desired. 



QT20 is the electric power plant (20KW) and has excess power for necessary maneuvering. 

The Max Prop can be feathered for lowest drag, or tricked into staying in reverse, which will charge the batteries using the motor regen capability. 

At the core of the electric dream is a small fuelless generator made with Neodynium 52 magnets and copper coils. When there is a constant supply of electricity available there are endless options for comfort 

and safety.




A naval architect, Jim's design portfolio is one of the most diverse in the industry, and  includes record-breaking custom multihull and monohull sailboats,  popular production boats, wing-sail assisted motor-catamarans, and recently, a solar-powered unmanned electric craft.  Always keeping an eye toward efficient innovation, Jim's expertise in  composite engineering yields high-performing and weight-effective structures. 



Berkeley Marine is the center of custom yacht construction in the San Francisco Bay Area. Racing yachts built at the yard are generating  considerable buzz for their advanced designs, and for contributing to the rebirth of a local industry. The facility's dedicated, experienced design and construction team is  the key to its success. Construction is led by long-time boat builder Cree Partridge, whose former company P-Squared Yachts, built dozens of high-performance racing yachts in Southern California throughout the 1980's.



For 38 years MarsKeel has united it's passion for sailing with it's vast technical experience supplying quality keels to custom yacht builders and sailors from around the  world, from the United States 

to South Africa and Turkey. With over 100 million pounds of castings over three decades, their casting  experience and metallurgical knowledge places MarsKeel Technology™ as  the worldwide industry leader.  Kevin Milne, Founder and President, has over 30 years of Metallurgical Casting experience, extensive knowledge of keel design and marine industry experience.



GMT Composites specializes in custom carbon solutions for any size sailboat, powerboat, or yacht. They have been building custom carbon composites since 1984; their range of projects is remarkable, and their experience is unmatched. From small decorative switch plates, to giant radar arches requiring absolute precision, their expertise can be applied to a huge range 

of custom carbon marine products.



Electric Yacht Pacific provides the finest affordable electric propulsion systems, complete systems engineered, built, tested and ready to install for boats from 2500lbs to 50000lbs. Electric Yacht Pacific has warranted quality marine systems with over 400 installations conversions from Alaska 

to California to Hawaii.   



AdvanTec is a collaboration of brands, each brand with a long service to marine and industrial clients from around the globe. Diamond Sea Glaze designs and manufactures custom windows, doors, 

and  hatches for customers around the world. DSG closures have quality built in,

so everything else stays out. Each order is manufactured separately from beginning 

to end in their 80,000 sq. ft. vertically integrated plant just outside Vancouver, Canada; one of a few closure manufacturers in the world that insists on processing it’s own glass so they can ensure optimum quality control.



Ronstan is a world-leading manufacturer of sailboat hardware, rigging  components, sailing wear and accessories created through innovative  thought and real-world testing. They offer a full range of yacht and  dinghy sailing products including blocks, sheaves, travellers, furlers, rope cleats, stainless steel fittings, sheet and halyard winches and  much more.  No matter whether you are a racing sailor or offshore  cruiser, their global team experience allows them to offer the perfect  sailing product solution to meet your needs. Based in Melbourne, Australia,  Ronstan's international network  includes offices and distribution centres throughout the United States,  Europe and Australasia. Their products have become the sailing equipment  of choice for racing dinghy classes, including the International Moth,  as well as many high-profile offshore racing programs like the Volvo  Ocean Race fleet. If you have a sailboat, you need Ronstan.



ANDERSEN Winches are all about Design and Engineering. They employ state-of-the-art manufacturing technology,  and  after half a century of designing and manufacturing ANDERSEN Winches feel they've earned the right to be proud.  ANDERSEN Winches has over 50 years of experience, and their 150  employees are dedicated to quality manufacturing. Their procedures are  based on the toughest demands in the business, and their engineers strive  constantly to improve their products even further, stretching from dedicated manufacturing to a 3-year factory warranty and reliable service worldwide. 



COPPERCOAT is possibly the most powerful  and long lasting anti-fouling available today. Developed in the 1980’s and available to the public since 1991, COPPERCOAT successfully protects tens of thousands of boats saving their owners time and expense.

.COPPERCOAT is the combination of a  specially developed zero VOC, water miscible epoxy resin and 99% pure copper powder (not cuprous oxide). Each liter of resin is combined with 4.4 lbs of ultra fine  atomized copper powder, making COPPERCOAT the strongest copper based anti-fouling available. Indeed no other anti-fouling exposes as much active copper to unwanted marine life as COPPERCOAT.

The average COPPERCOAT customer world wide gets about 10 years of protection before they need to do their first touch-ups.  That doesn't mean 10 years is a magic number; if you are in a mild fouling location it might be 12 years or more before you need to do anything. And if you are in a high fouling area and using an aggressive pad to clean the waterline it might be only 9 years



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