19' Gaff Sloop Centreboarder, based on a design by Paul Gartside 14 entries, 39 photos Back to the log

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new build

19' Gaff Sloop Centreboarder, based on a design by Paul Gartside

Spartan II

Dale Simonson · 2026

A build log

19' Gaff Sloop Centreboarder, based on a design by Paul Gartside

Spartan II


kept by Dale Simonson, Victoria, BC

2026

The boat

Spartan II

Designer
Paul Gartside
Length overall
19′ 0″ (5.79 m)
Beam
8′ 0″ (2.44 m)
Hull
wood
Construction
strip planked
Started
1 January 2026
Built by
Dale Simonson
Built at
Victoria, BC

A much bigger boat for us... for the last 14 years, since I built and launched her, we've been cruising on our 12' Welsford Scamp LUNA. This is going to be fun!

What it took

By the numbers

53
Hours at the boat
4 months
From first day to last
14
Days written up
39
Photographs
736
Words written

The work

Contents

Chapter 01

Planning & Research

Choosing the design, sourcing plans or a kit, budgeting, lining up materials.

2 days 8 hours from December 2025

Planning & Research 3.5 h

Choosing Boat to Build, and Estimating Bill of Materials

My good friend Arnt proposed we build a boat for my wife and I in his shop. We selected Paul Gartside's design #164 "Spartan II" so I purchased the study plans, and started estimating a bill of materials.

Spartan II: Choosing Boat to Build, and Estimating Bill of Materials

Planning & Research 4 h

Received the Plans

Ordered the plans, had them printed, and immediately started thinking about things we might change a bit! For instance: the cabin height could be a bit taller so we can sit up on the bunks!

Spartan II: Received the Plans
Photo 1
Spartan II: Received the Plans
Photo 2

Chapter 02

Hull Panels

Scarfing plywood, cutting panels, milling strips or planking stock.

1 day 7 hours from February 2026

Hull Panels 7 h

Purchase and rip cedar for strip-built hull

The design calls for strip-building, 3/4" by 1-1/4" Western Red Cedar, glassed inside and out. We found some very tight-grained 2x4 green material at a local building supply, and purchased 17 10-footers and 17 12-footers. They'll have to be scarfed to achieve our desired length, a little over 21 feet. Totally stunning wood... there isn't much of this stuff left in our forests, so, worth every penny of their ridiculously expensive price!

Ripped it down to 3/4 by 1-1/2" ...a bit wider than the plans, but a much better cut out of the material. We'll see how difficult it is at the turn of the bilge, and perhaps have to rip a few in half at the sharpest turn. Then stickered and stacked them up in the shop rafters to air dry.

Spartan II: Purchase and rip cedar for strip-built hull
Photo 1
Spartan II: Purchase and rip cedar for strip-built hull
Photo 2
Spartan II: Purchase and rip cedar for strip-built hull
Photo 3
Spartan II: Purchase and rip cedar for strip-built hull
Photo 4
Spartan II: Purchase and rip cedar for strip-built hull
Photo 5

Chapter 03

Rig & Spars

Mast, boom, standing and running rigging, sails.

8 days 23 hours from February 2026

Rig & Spars 3 h

Recycling a Mast

When Arnt bought his 23' gaff cutter ANJA, it had a solid fir mast that was smaller in diameter than designed in the plans. Finding it much too flexible, he build a new one, and hung this one up in rafters of his shop. We took it down and scraped off all the paint to see if it would work for our new boat.

Spartan II: Recycling a Mast

Rig & Spars 6 h

Split the old mast down the centre and hollow it out

After stripping the paint off it looked like it might be ok. However, it seemed to be made up of many pieces, so we ripped it down the centre on the bandsaw to see what the structure was. There was some rot in the bottom where the tabernacle hinge bolt went through, but the scarfs looked fairly good if we put in a couple of dutchman repairs into the few spots we didn't like. The plans for this boat call for a hollow mast of Douglas fir, so this might be just the ticket!

Spartan II: Split the old mast down the centre and hollow it out
Photo 1
Spartan II: Split the old mast down the centre and hollow it out
Photo 2
Spartan II: Split the old mast down the centre and hollow it out
Photo 3
Spartan II: Split the old mast down the centre and hollow it out
Photo 4
Spartan II: Split the old mast down the centre and hollow it out
Photo 5

Rig & Spars 5 h

Mast, continued: hollowing, repairing scarfs, and cut scarf on the bottom

Once we achieved the desired sidewall dimensions for the hollowed section, we routed out and epoxied in a few dutchmans to the iffy spots of the original build. And, we cut the rotten bottom off and put in a nice long 12:1 scarf to receive a new butt end.

Spartan II: Mast, continued: hollowing, repairing scarfs, and cut scarf on the bottom
Photo 1
Spartan II: Mast, continued: hollowing, repairing scarfs, and cut scarf on the bottom
Photo 2
Spartan II: Mast, continued: hollowing, repairing scarfs, and cut scarf on the bottom
Photo 3
Spartan II: Mast, continued: hollowing, repairing scarfs, and cut scarf on the bottom
Photo 4
Spartan II: Mast, continued: hollowing, repairing scarfs, and cut scarf on the bottom
Photo 5

Rig & Spars 3 h

New mast base

Arnt had been wondering what to do with this old chunk of fir... it's now going to be the base of our mast. It's a bit heavier than ideal, hoping it doesn't ruin the righting moment too much.

Spartan II: New mast base

Rig & Spars 1.5 h

Glue up top of mast

You'll note there are no wires in the mast... I've decided to keep the boat systems as basic as can be, I'll hoist an anchor light when I need one, and judge the wind strength and direction by analog means.

Spartan II: Glue up top of mast
Photo 1
Spartan II: Glue up top of mast
Photo 2
Spartan II: Glue up top of mast
Photo 3
Spartan II: Glue up top of mast
Photo 4
Spartan II: Glue up top of mast
Photo 5

Rig & Spars 1 h

Glue in base of mast

As per our regular practice, we use West System epoxy... wet out all surfaces with neat; then add appropriate thickener, in this case #406 Colloidal Silica. Not too much clamping pressure so it doesn't squeeze everything out!

Spartan II: Glue in base of mast
Photo 1
Spartan II: Glue in base of mast
Photo 2
Spartan II: Glue in base of mast
Photo 3
Spartan II: Glue in base of mast
Photo 4

Rig & Spars 2 h

Photojournalist drops in

Photos by William C. Weaver IV... William dropped by to get a few shots of the build, and found us planing the mast down to approximate final dimensions (before rounding).

Spartan II: Photojournalist drops in
Photo 1
Spartan II: Photojournalist drops in
Photo 2
Spartan II: Photojournalist drops in
Photo 3
Spartan II: Photojournalist drops in
Photo 4

Rig & Spars 1 h

Rounding mast

While waiting for the paint on the lofting plywood to dry, we spent about a hour rounding the mast. The area in the photo is where it will transition from the 8 sided base to round. Just starting that job, there will be more to do on it, later. But now, lunch, then to get on with the lofting (if the paint is dry).

Spartan II: Rounding mast

Chapter 04

Plans & Lofting

Reading the drawings, lofting full-size, making patterns and templates.

3 days 16 hours from March 2026

Plans & Lofting 5.5 h

Lofting

Laid plywood on shop floor, painted it flat white, laid out a baseline, waterlines, stations, and started to draw the lines at full size.

Spartan II: Lofting

Video: https://player.vimeo.com/video/1245289966


Plans & Lofting 3 h

Lofting, continued

Lofted the halfbreadths, and checked the bodyplan against them. We forgot that the halfbreadths gave valuable information to the bodyplan, so had to make some adjustments to virtually every station. Obviously need more practice lofting!

Spartan II: Lofting, continued
Photo 1
Spartan II: Lofting, continued
Photo 2

Plans & Lofting 7 h

Lifting patterns

More lofting, and then lifting patterns from the lines. We placed nails, sideways, with their heads on on the line we wanted to lift. Then we put doorskin ply over top of those nails, and stomped on them. Lifted the doorskin, put finishing nails into the impressions the nailheads created, put battens around them, drew the lines, and cut the doorskins out on the bandsaw.

Spartan II: Lifting patterns
Photo 1
Spartan II: Lifting patterns
Photo 2

Video: https://player.vimeo.com/video/1245604089

boatbuildlog.com

19' Gaff Sloop Centreboarder, based on a design by Paul Gartside
14 entries, 39 photographs, written down as the work was done.

The words and photographs in this log belong to Dale Simonson.

The log itself lives at
https://boatbuildlog.com/builds/19-gaff-sloop-centreboarder-based-on-a-design-by-paul-gartside

Printed 10 November 2026