Thomas Harrison Butler
Encyclopedia
Thomas Harrison Butler (19 March 1871 - 29 January 1945) was a British
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 ophthalmologist and amateur boat designer. He published various designs of small, traditionally built yacht and was particularly concerned with the boat's handling under sail.

Harrison Butler was "a strong believer in the 'metacentric shelf formula' to achieve good balance and handling under sail. The theory held that as a yacht heels under sail, its balance will depend on the immersed form of the hull, with different sections exerting varying degrees of buoyancy and aft sections possibly being more buoyant than forward sections. Metacentric shelf analysis plots the shifts in the varying buoyancies as a net value to windward or leeward and serves as a guide to achieving equal buoyancy in the dissimilar ends of a design. The work can now be done by computer, but when it was applied by the brain, hand and eye of Dr. Harrison Butler it produced famously sweet-handling boats, in the age of heavy weather helm."

In the days before computers, Harrison Butler was known to cut out paper cross sections of his hulls in order to calculate lines of symmetry and centres of mass. Boats built to his designs are noted for their sleek looks as well as their pleasant handling.

He wrote two books, Cruising Yachts: Design and Performance, and An Illustrated Guide to the Slit-Lamp. and was the subject of a 1980s BBC TV documentary.

Designs

  • Almonde

  • Cyclone II Bermudan Cutter A small sailing yacht.

Overall Length: 25ft 6in 7.77m
Waterline: 22ft 6in 6.85m
Beam: 9ft 1in 2.76m
Draught: 4ft 6in 1.37m
Displacement: 13 000lbs

  • Yonne Class Cutter Described by Harrison Butler as a 'sports model'.

Overall Length: 32ft 9in
Waterline: 22ft 6in
Beam: 8ft 6in
Draught: 4ft 6in

  • Zyklon Similar to a Falmouth Quay Punt
    Falmouth Quay Punt
    The Falmouth Quay Punt evolved in the UK port of Falmouth, Cornwall around the beginning of the 20th century. Falmouth, with a good deep water harbour situated near the Western entrance to the English Channel, was a popular port for large merchant sailing ships to call "for orders"...

    , although smaller and with traditional rigging. Versions of the Zyklon were built by Alfred Lockhart Ltd. and known as the 'Z' 4-tonner.

Overall Length: 21ft 9in
Waterline: 19ft
Beam: 7ft 2in
Draught: 4ft
Displacement: 7 400lbs

The Harrison Butler Association

A Harrison Butler Association was formed in 1973 for anyone interested in his designs. It aims to keep track of Harrison Butler boats worldwide and help owners keep in touch. It holds two meetings and produces two newsletters annually.

External links

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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