Great Auk Double

A comfortable and efficient sea kayak for two paddlers
Great Auk Double Tandem Sea Kayak
Great Auk Double Strip Built Sea Kayak Plans
Colin Leavett Brown Great Auk Double Strip Built Kayak

By stretching out the Great Auk I have created a tandem sea kayak that will be comfortable for occasional paddlers while providing an efficient and capable boat for a pair of skilled kayakers. The long waterline allows a couple of strong paddlers to really step out and go fast, while the respectable volume provides enough capacity to carry gear for multi-day trips.

The Great Auk Double is a modified version of the Great Auk. It is longer and a little wider to carry the heavier load of two people plus their gear. Taking the sleek lines of the Great Auk to make a fast and comfortable tandem for intermediate paddlers. This is not just a simple stretch of the Great Auk. I have adjusted the shape to add more volume near the ends. This combined with a higher bow will help the boat rise easily over waves.

This boat fits in between the Guillemot Double and Guillemot Fast Double in terms of performance. It will be faster than the Guillemot Double because it is a little longer and narrower. This makes it a little less stable. But it is not as long or as narrow as the Fast Double.

Included in the Plans:

  • Eleven 24" x 36" [61cm x 91cm] Drawing Pages including: An overall drawing, a full size "stacked" form drawing showing all the forms and then all the forms drawn individually and at full size. Also included is a full size pattern for the cockpits.
  • Kayak Building Notes: These notes provide supplemental information such as bill of materials for each design.

Recommended Manual:


Digital Download

Body Plan Drawing
Great Auk Double Strip Built Sea Kayak Body Drawing
Profile Drawing
Great Auk Double Woodstrip Sea Kayak Profile Drawing
Plan (Top View) Drawing
Great Auk Double Cedar Strip Sea Kayak Plan Drawing


Beginner Small Paddler Average Paddler Large Paddler Extended Tour Fishing Lakes and Rivers Open Water Racing Surf


Length Ft Beam In Beam Gunnel (in) Waterline Length Ft Waterline Beam In Design Displacement Lbs Draft In Waterplane Area Sq Ft Wetted Area Sq Ft Surface Area Sq Ft Volume Cu Ft
21.00 26.00 20.10 24.30 391.00 3.80 27.70 31.10 80.00 21.50

Secondary Measurements

Prismatic Coefficient Block Coef Midship Area Coefficient Waterplane Area Coefficient Lateral Plane Coef Sinkage Moments to change trim 1 inch Righting Moment at 1 degree Vertical Center of Gravity above DWL
0.59 0.47 0.81 0.68 0.81 132.00 143.00 3.02 6.70

Stability Curves

Predicted Drag