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Design No. 0231

Built for: John Guzzwell
Builder: John Guzzwell, Victoria, Canada
Date designed: 1955

Class – Hull Number  Columbia Class No. 1

Principal Design Data

L.O.A:  20′ 6”  (6.25 m)
Datum: 18’ 5”  (5.65 m)
Beam Max: 6’ 5″  (1.98 m)
Draft:  4’ 5”  (1.37m)
Displacement tons: 1.39
T.M.: 3 tons
Ballast ratio: 31.8%
Sail Area: 197 sq. ft
Rig: Bermudan Yawl

John Guzzwell’s design brief called for a self-build 20’- 21’ L.O.A. yawl and his requirements included a sufficient length of straight keel to facilitate slipping. Reverse sheer, self-draining cockpit, watertight compartments fore and aft to be used for stowage.  The hull should be sufficiently robust to resist damage by collision with “deadheads”, i.e. water-logged logs, a common hazard of British Colombian waters.  The ability to ride out bad weather at sea was called for, and was in the owner’s mind in deciding on a yawl rig.

An essential feature of the Columbia Class, and one to which Jack Giles attached great importance was that they should be, so far as possible, unsinkable; achieved by providing watertight compartments fore and aft.  The hull possesses an enormous reserve of buoyancy and the bow and stern compartments are closed by removable watertight hatches and panels.  The somewhat unusual angled covering board was designed to give acceptable headroom in the cabin without excessive apparent freeboard and windage in the topsides.


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Additional Information

Individual Drawing Copies

Please download and print the drawings list for Trekka, Individual plan copies cost $85.00 which includes standard airmail. Please contact us using the link for information on how to order.

Download Drawing List

Study Notes

14 page A4 format colour booklet containing many small scale drawings and photographs as well as technical data and an abridged specifications of Trekka and the Columbia Class. Construction scantlings of the cold moulded and strip plank versions are outlined as are the variant rig arrangements.
Included are generic drawing lists for each of the alternative designs and information for clients considering building a new Columbia class or replica of Trekka

Model Plans

D:Blue Laurent Giles Naval Architects (NZ) LtdProjects�200-02 D:Laurent Giles Naval Architects (NZ) LtdProjects�200-0249�2

Full set of Stock Building Plans

2313 Construction & General Arrangement low res

A replica of Trekka can be constructed from the original 1955 drawings for cold moulded construction, or if preferred using strip plank construction for which full construction, rigging and outfit drawings will be provided, please specify when ordering.

Poster & Art Prints