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Lake Union Swift
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Lake Union Swift
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Lake Union Swift
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Lake Union Swift
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Lake Union Swift
Lake Union Swift Thumbnail
Lake Union Swift Thumbnail
Lake Union Swift Thumbnail
Lake Union Swift Thumbnail
Lake Union Swift Thumbnail

Lake Union Swift

Builder Testimonials

A lapstrake dinghy that's a delight to sail and a delight to look at.

  • Skill Level Pro-Kit
  • Estimated Build Time 160 Hours

Build this boat if...

  • You want a small and agile sailboat with comfortable side benches
  • Your kids are at the age to be intrigued by the idea of building and sailing a small sailboat
  • You are an organization looking for a fleet of sailboats that could be used by youth and adults in your community
  • Quality Materials

    Only the best professional-grade materials

  • Classic Appeal

    Traditional looks that will never age

  • For Woodcrafters

    Boatbuilders, sharpen your block planes! 

Build Your Kit

Take One of our Boatbuilding Classes

We offer classes for many of the boats we sell. Teaching sites stretch from Maryland to Washington State and from Maine to California. Click here to find out more.

Specifications

Length
10' 0"
Beam
52"
Rowing Draft
6"
Sailing Draft
30"
Sail Area
78 sq. ft.
Hull Weight
150 lbs.
Max Payload
450 lbs.

Performance

Stability

5 out of 5
Very Tippy
Very Stable

Speed

3 out of 5
Cruiser
Racer

Cockpit Room

3 out of 5
Close Fit
Huge Cockpit

Payload

3 out of 5
Day Tripper
Freight Hauler

Ease of Construction

3 out of 5
Requires Patience
Very Easy
Lake Union Swift with the lug rig sailing on the Severn River in Maryland
Lake Union Swift with the lug rig sailing on the Severn River in Maryland

Overview

Pro-Kit     THIS IS A PRO-KIT

The Lake Union Swift is a 10'-long sailing dinghy that is a variant of our popular Tenderly Dinghy.

While Tenderly is optimized for all-around utility as, well, working as a tender, the Lake Union Swift is more of a pure sailing machine. The two designs share a hull shape, but are otherwise distinctly different designs. The prototype for this design was known as the "Tenderly XP." The Center for Wooden Boats in Seattle is currently building a fleet to use for sail training on Lake Union, and have given the design a much-better name, the Lake Union Swift.

Kits for the Lake Union Swift are available as a CLC ProKit, a format that is suitable for builders who have assembled a few stitch-and-glue boats already. The ProKit builder should be comfortable reading boat plans and have experience working with epoxy and fiberglass.

The Swift kit includes an illustrated builders guide that comprises 38 pages of detailed step-by-step diagrams. The sailing component kit includes a custom 17'-long aluminum Dwyer mast, shipped full-length, along with specialized hardware including goosenecks, aluminum spreaders, and spreader brackets. To learn more about CLC ProKits here

Some background on this design:
Early on, it was noted that, quite aside from its admirable qualities as a yacht tender, the standard Tenderly is an unusually sprightly sailboat. Designer John C. Harris pondered whether a decked-in version with a taller rig and a bowsprit might make a fun daysailer, club-racer, or trainer.

One of the most obvious differences between Tenderly and the new design are the Lake Union Swift's structural bench seats, running most of the length of the boat. Without adding weight, the seats provide better ergonomics for sitting while under sail. The seats and forward deck enclose a vast watertight volume of built-in flotation. This allows for rapid recovery from a capsize, which is an event that could be more likely to occur with the sporty jib-headed sail plan. 

Building a Lake Union Swift

 

While adding slightly to the building complexity, the Lake Union Swift's pivoting centerboard will be appreciated by anyone launching from, or sailing through, shallow water.

John Harris's original idea was for the Lake Union Swift to be sold as a purist's sailboat, great fun for knocking about bays and lakes with one or two adults, or an adult and a couple of kids. The additional strings of the jib-headed rig make that option fun for experienced sailors, and give beginners (and kids) more to do. With their shapely lapstrake hulls and bowsprits, a fleet of these racing around the buoys would be strikingly pretty to watch, and a barrel of fun for those aboard.

The first prototype was built at the WoodenBoat School in 2017. After a few test cycles refining the sloop rig, it was observed that the Tenderly Dinghy's lug rig was plug-and-play in the Lake Union Swift. They share a common mast step, and no modification is required. Et voilà! Suddenly the Lake Union Swift becomes the elusive small sailboat design WITH comfortable bench seating! For those whose knees no longer answer for sitting on the floorboards, a Lake Union Swift with the lug rig's simple, single sail is a perfect fit.

Since the Lake Union Swift and the Tenderly Dinghy are almost exactly the same weight, you get all of Tenderly's sparkling performance combined with the comfort and safety of bench seating. (If there's any doubt, check out the photos of the lug-rigged Lake Union Swift planing with a 185-pound crew aboard.)

Given watertight hatches in the tanks, the Lake Union Swift would work great as a small beach-cruiser. A thwart amidships supports the centerboard trunk and is sited for comfortable rowing when the wind dies or if you need to work yourself clear of the shoreline.

Questions will arise about the interchangeability of sailing components between the Tenderly Dinghy and the Lake Union Swift. The two designs share the same hull shape, rudder, and mast step. Otherwise everything is pulled from separate parts bins, and there are limits to what features can be shared.

Buying Options

Choose Your Boatbuilding Experience

Start your kit-building experience by selecting the option that best fits your goals. Don’t have the confidence to build on your own? No worries! Join a boatbuilding class or hire us to build a custom boat for you.

  1. Select Your Configuration

    Build From a Kit:
    Most Pro Kits include, at minimum, the CNC-cut marine plywood parts. Many include epoxy, fiberglass, and timber as well.
    Build From Scratch:

    Source your own materials and hardware, and work from traditional plans.
    Order Study Plans or Assembly Guides:
    Like to study up a bit first? Where available, download study plans or a copy of the assembly guide.

  2. Choose Options and Add-Ons

    Additional Components:
    If this is a sailboat, you’ll need the Sailing Component Kit. Depending on the model, you can choose different sail colors, order a Line & Cordage Package, add nonskid decking, storage covers, and more.

  3. Get Building!

    Computer-cut kits feature all of the latest tweaks for easy assembly, including slot-together frames, pre-drilled holes for stitching-and-gluing, puzzle joints, and precision in the fitting of parts.

Standard Configuration

Sale
$2,575.00 $2,310.00

The Lake Union Swift base hull kit includes all hull parts co...

Alternative Configurations

$1,880.00

The Lake Union Swift Wood Parts Only Kit is intended for buil...

$219.00

The plans-and-manual package for the Lake Union Swift is for ...

$89.00

This option  to DOWNLOAD the complete Lake Union Swift full-s...

$35.00

This option comprises the latest version of the full-color, 3...

$30.00

This option comprises the latest version of the full-color, 3...

$2.99

You can get printable study plans for most of your favorite ...

$3,925.00

The Lake Union Swift Sloop Sailing Component kit includes a c...

$1,999.00

The Lake Union Swift Lug Rig Sailing Component kit includes w...

Additional Options

$125.00

The Lake Union Swift's Line and Cordage package for the sloop...

$84.00

The Lake Union Swift's Line and Cordage package for the lug r...

Videos

Building a SAILBOAT in Just 6 Weeks!--XylaFoxlin

1 Lake Union Swift Build - July '22

11 Lake Union Swift Build - May '23

Frequently Asked Questions

How do I order this kit?

Click on the Buying Options tab the top left of this page and follow the directions.

How much does this boat weigh and how much can it carry?

The weight and payload of this boat, along with other statistics such length and beam, can be found under Specs in the Specifications section, which is just below the lead image seen at the top of this page.

Can I put an engine on the Lake Union Swift?

Yes, but first you have to remove the rudder and sailing rig. Then you can clamp a small outboard to the transom. What you cannot do (in either the Lake Union Swift or the Tenderly) is to mount an outboard off to one side on the transom, on standby as an auxiliary to the sailing rig or oars. The transom isn't big enough. To have the "outboard backup" option, you'll need to look to a boat the size and displacement of something like PocketShip.

The Lake Union Swift's sloop rig has an aluminum mast. Is a wooden mast an option for the sloop rig?

We tried. We built a couple of hollow wooden masts for the prototype Lake Union Swift. A mast for the sloop rig needs to be light, which makes the mast hard to build. In kit form the wooden masts would be more expensive than aluminum, with the additional disadvantage of being tricky to assemble.

Should you desire a lug rig, that rig's much-shorter mast is a simple, solid stick. Classic folk technology that will never go out of style.

I have a Tenderly with its balanced-lug rig. If I build a Lake Union Swift Base Kit, can I use that rig in both boats?

Yes! Tenderly's unstayed mast drops right into the Lake Union Swift's mast step, and balance under sail is perfect.

If the Lake Union Swift has all these cool performance features. Why would I want to build the Tenderly instead?

Tenderly is a delightful little sailboat in its own right and we've spent hours and hours sailing stock-standard Tenderly Dinghies. The important difference is that Tenderly has a more open, flexible interior layout compared to the Lake Union Swift. Tenderly is optimized to work well in many roles, including as a rowing boat, and the seating is arranged for comfortable boat-taxi service for up to three adults.  Tenderly can even take a small outboard engine. The Lake Union Swift's interior, by contrast, is arranged for a sailing crew of one or two adults, or an adult and a couple of kids. You can row the Lake Union Swift--easily, and a long way if you had to---but only from a single station, which would be a challenge if you had a passenger along.

Can you send me the plans digitally?

Sorry, but until digital rights management technology for marine architectural work catches up to that used for books and music, we are unable to transmit digital plans. Currently, only study plans and manuals can be sent digitally.

What is LapStitch Construction?

CLC'S LapStitch™ Construction

Patent No. 6,142,093 

Our system combines the unquestioned grace of lapstrake hulls with the proven ease of stitch-and-glue construction. The strength of the LapStitch™ joint is such that the designs require comparatively little fiberglass or fillet work, making them especially easy to build.

Lapstrake hull shapes evolved over millennia. Many would suggest that the type reached a high-water mark with the Viking longboats, but the actual building method was little changed right up into the 20th century. Planks were riveted together, and the technique required prodigious skill on the part of boatbuilders.

Over the last few decades, the advent of modern adhesives and high-quality marine plywood brought about the first major innovation in lapstrake building methods: "glued plywood" lapstrake hulls. This method of planking produces very strong, stiff, and beautiful hulls that never leak. This is progress, to be sure, but glued lapstrake boats still require molds and arcane joinery skills. It isn't a process suited to amateurs.

In 1997, Chesapeake Light Craft developed a way to build lapstrake boats without molds or complex "rolling bevels" on the lapstrake planking. Using sophisticated computer design software, we are now able to devise hull shapes that will assume a round-bottomed shape without a jig or "torturing" of the wood. A special "rabbet," or groove, is machined into each strake so that they are self-aligning. They are wired together just like a stitch-and-glue kayak. When these joints are filled with epoxy, the result is a remarkably stiff and strong hull that is visually indistinguishable from traditional lapstrake planking.

LapStitch construction is featured in these CLC boats:

After more than 15 years of development, the evolution of LapStitch™ has reached the stage where we can render complex lapstrake hull shapes in complete confidence without "strongback" molds.  Chesapeake Light Craft can design and build for you LapStitch™ hulls of any shape or size.  

Extras

Read the Review in 48North

Lake Union Swift

A New Sail Training Design, Built by Local High Schoolers

Anyone who spends time on the pleasant waters of Seattle's Lake Union will be familiar with the always-busy fleet coming and going from the Center for Wooden Boats (CWB) at the south end of the Lake. CONTINUE

Classes

Take One of our Boatbuilding Classes

We offer classes for many of the boats we sell. Teaching sites stretch from Maryland to Washington State and from Maine to California. Click here to find out more.

View Classes

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We’re here to help with any questions you might have during the build process.

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