A sit-on-top fishing kayak
by Laurie McGowan


WB No. 250, May/Jun 2016: MANTA is a simple and versatile boat—quick to build, and quick to get underway.

The designer considered three different hull shapes when developing the concept for a home-buildable sit-on-top fishing kayak. He chose No. 2—a V-bottomed hull (the green one) —for its relative ease of construction and good performance.

MANTA’s simple shape is built by first forming the sides, and then installing the interior framework. The bottom, deck, and details follow.


  • LOA: 11′  (335 cm)
  • Beam: 2′ 4″ (71 cm)
  • Weight: Weight 32 lbs. (14.5 kg)
  • Displ. at LWL shown 245 lbs (111 kg)

Laurie McGowan is a boat designer in Nova Scotia with a diverse on- and below-water work history; he specializes in energy-efficient commercial and pleasure boats. More of his work may be found at

Do you have a boat concept you’d like to see Laurie McGowan develop on these pages? If so, send it to Sketchbook, WoodenBoat Publications, P.O. Box 78, Brooklin, ME 04616, or email it to Your letter should be no longer than 500 words.