HD-4 hydrofoil at the Alexander Graham Bell museum
Women workers building lifeboats at Dr. Alexander Graham Bell's laboratory at Beinn Bhreagh.

It was designed and built at the Bell Boatyard on Bell's Beinn Bhreagh estate near Baddeck, Nova Scotia.

- HD-4

In order to build the experiments labelled HD 1, HD 2, HD 3, and HD 4, (HD standing for Hydrodrome) Dr. Bell and Casey used the laboratories and staff to construct the various pieces needed.

- Bell Boatyard
HD-4 hydrofoil at the Alexander Graham Bell museum

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Bell c. undefined 1917

Alexander Graham Bell

Scottish-born inventor, scientist and engineer who is credited with patenting the first practical telephone.

Scottish-born inventor, scientist and engineer who is credited with patenting the first practical telephone.

Bell c. undefined 1917
Melville House, the Bells' first home in North America, now a National Historic Site of Canada
Bell, top right, providing pedagogical instruction to teachers at the Boston School for Deaf Mutes, 1871. Throughout his life, he referred to himself as "a teacher of the deaf".
Alexander Graham Bell's telephone patent drawing, March 7, 1876
The master telephone patent, 174465, March 7, 1876
An actor playing Bell in a 1926 film holds Bell's first telephone transmitter
Bell at the opening of the long-distance line from New York to Chicago in 1892
Alexander Graham Bell, his wife Mabel Gardiner Hubbard, and their daughters Elsie (left) and Marian ca. 1885
The Brodhead–Bell mansion, the Bell family residence in Washington, D.C., from 1882 to 1889
Alexander Graham Bell in his later years
Photophone receiver, one half of Bell's wireless optical communication system, ca. 1880
Bell's HD-4 on a test run ca. 1919
AEA Silver Dart ca. 1909
Bell statue by A. E. Cleeve Horne in front of the Bell Telephone Building of Brantford, Ontario, The Telephone City. (Brantford Heritage Inventory, City of Brantford)
A quote by Alexander Graham Bell engraved in the stone wall within the Peace Chapel of the International Peace Garden (in Manitoba Canada and North Dakota, USA).
The Bell Museum, Cape Breton, part of the Alexander Graham Bell National Historic Site
A.G. Bell issue of 1940
Bell, an alumnus of the University of Edinburgh, Scotland, receiving an honorary Doctor of Laws degree (LL.D.) at the university in 1906

Bell also built the Bell Boatyard on the estate, employing up to 40 people building experimental craft as well as wartime lifeboats and workboats for the Royal Canadian Navy and pleasure craft for the Bell family.

The experimental boats were essentially proof-of-concept prototypes that culminated in the more substantial HD-4, powered by Renault engines.