Petrel

A rough water play kayak
Petrel Strip Built Sea Kayak
Petrel Strip Built Sea Kayak Plans
Petrel Strip Built Sea Kayak in Big Waves
Petrel Strip Built Sea Kayak Near Petite Manan Light House

Early sailors thought the Storm Petrel could walk on water. Named after Saint Peter, petrels are small birds that feed at sea by fluttering just above the swell with their feet tip-toeing across the water. Like its bird namesake the Petrel kayak is at home at sea where it can dance among the waves.

Designed as a responsive, light-weight boat suitable for day trips in rough water it is equally at home poking into sheltered estuaries or exploring the shore of isolated coves. This design will carry a large paddler through rough conditions yet it is small enough to be easily handled by petite kayakers. With a form inspired by the Inuit inventors of kayaking, the Petrel will appeal to devoted Greenland-style paddlers without being intimidating to novice sea kayakers.

This boat is derived from my Night Heron designs, but it is shorter, has more rocker and more reserve buoyancy in the ends. The moderately hard chine of the strip Night Heron has been softened forward of the cockpit and transitions into a hard chine behind the cockpit. The result is a lively boat that accelerates quickly to catch waves, carves down wave faces and maneuvers easily.

The "transitioning" chine varies from a quite rounded, soft chine forward to a hard chine aft of the cockpit. The forward section provides smooth performance pushing out into waves and reduces the tendency to broach while surfing. The hard chine aft provides some shape that facilitates carving and leaned turns.

The deck shape takes its queue from Greenlandic Inuit skin-on-frame designs with a sharp chine-like feature line on either side. This provides height where you need it for knee room, while keeping the deck low over all. The side of the deck slopes in quickly so it is out of the way for close-to-the-hull strokes.

This design was developed to carry a 200 lbs, 6+ foot paddler on day trips, but it is small scale enough that it would also work well for substantially smaller paddlers.It is meant as a day tripping boat for larger paddlers, and would not have the capacity for extended trips, but if you are a smaller paddler there is enough interior volume to carry a fair amount of gear.

Included in the Plans:

  • Nine 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 are templates for the cockpit and coaming recess parts.
  • Kayak Building Notes: These notes provide supplemental information such as bill of materials for each design.

Recommended Manual:

Body Plan Drawing
Petrel Strip Built Sea Kayak Front View
Profile Drawing
Petrel Strip Built Sea Kayak Side View
Plan (Top View) Drawing
Petrel Strip Built Sea Kayak Top View

Features

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

Measurements

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
17.00 20.00 15.00 19.90 245.00 4.10 16.50 20.20 46.00 11.00

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
0.55 0.36 0.83 0.67 0.75 78.00 63.70 0.12 6.40

Stability Curves

Predicted Drag