Model: Length: Hull Weight: Beam: Max Payload: Rowing Draft: Sailing Draft: Sail Area:
Lake Union Swift 10' 0" 150 lbs. 52 in. 450 lbs. 6" 30" 78 sq ft.
Lake Union Swift Configurations:
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Standard Configurations:
Lake Union Swift - Base Hull Kit
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$2575
$2315
Alternative Configurations:

Sailing Component Kit - Sloop Rig
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$3849
$3465

Sailing Component Kit - Lug Rig
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$1895
$1705

Lake Union Swift - Wood Parts Only
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$1880
$1695

Lake Union Swift Full-sized Plans and Builders Guide
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$219
$197

Builder's Guide Only - Color Print
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$35
$31
Additional Components:

Sail Package - Line & Cordage - Sloop Rig
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$125
$118.75

Sail Package - Line & Cordage - Lug Rig
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$84
$79.80



The Lake Union Swift is a 10-foot sailing dinghy and a variant of the popular Tenderly Dinghy.

While Tenderly is optimized for all-around utility as, well, 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 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: "Lake Union Swift."


Kits for the Lake Union Swift are available as a CLC "ProKit," a format suitable for builders who have assembled a few stitch-and-glue boats already. The assembly manual comprises 38 pages of detailed and easy-to-follow step-by-step diagrams.

Some background on this design:
Noting that the standard Tenderly is an unusually sprightly sailboat, yet easy to handle, designer John C. Harris pondered whether a decked-in version with a taller rig and bowsprit might be 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. This built-in flotation allows for rapid recovery from a capsizesomething more likely to happen with the sporty jib-headed sailplan. 

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 beautiful to watch, and a barrel of monkeys for the sailors.

The first prototype was built at the WoodenBoat School in 2017. After a few test cycles refining the sloop rig, it was noted 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.

Lake Union Swift Sailboat Kit

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.