afloat

Osiris

Also known as: Glen Mumbles, Glen Marissa, G12

Built 1949W A Clapham

Testing traditional sails by North Sea Sails, Tollesbury, UK · 2025

Osiris is a wooden Glen Class yacht designed by A. Mylne & Co. (design 400) and built in 1949 by W.A. Clapham at Bangor, County Down, as hull number 12 for Glen Boatyard. The yacht measures 7.62 metres in length overall with a waterline length of 5.49 metres, a beam of 1.98 metres, and a draft of 1.22 metres. Currently fitted with an electric outboard motor, Osiris remains afloat.

Specification

LOA (spar)7.6 m · 25 ft

LOD7.6 m · 25 ft

LWL5.5 m · 18 ft

Beam2.0 m · 6 ft

Draft1.2 m · 4 ft

Sail area24.805 m²

TM tonnage3.5

Details

Built1949

Yard number12

BuilderW A Clapham, Bangor, Co Down

ConstructionWood

Engineoutboard, epropulsion spirit 2 2 kw electric motor

Port of registrySwansea, Wales

Current locationCoal Harbour, Dun Laoghaire Harbour. Ireland

Registry & Identity

Sail numberG53

History & Notes

Small modifications to cockpit and teak decked. Originally built Glen Boatyard, as Hull number 12. 1949 approx. Original owner J.S. Boumphrey

Design Archive

Sail Plan

Design No. 400

Glen Class

Designed 1945

View in design archive

Sister Yachts

37 other vessels built to the same design.

Historical Context

The Glen Class, designed in 1945, emerged during a period of transition for A. Mylne & Co. as post-war yacht design began to reassert itself. The class reflected modest but sound design principles suited to small-scale leisure sailing. Multiple examples were built by different constructors, including W.A. Clapham at Bangor, indicating the design's commercial viability and appeal to boatbuilders across Britain and Ireland. Osiris, as hull 12 from Glen Boatyard, represents one documented instance of the class. The design's longevity—with examples still afloat more than seventy years after construction—testifies to the durability of wooden construction and the soundness of the original design.

Ownership

Current owner

Ross Cahill-O'Brien

Since Jun 2016

Crew

No crew records yet. If you’ve sailed on this yacht, claim your place in her history.

Community

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