Question: \When was the Scottish-born scientist, inventor and engineer died who formed "Silver Dart"?

Context articles: Dart Harbour &amp; Navigation Authority
Alexander Graham Bell
History of Baddeck
Bell Oionus I
Clarence Dart
History of aviation in Canada
Golden Hawks
AEA Silver Dart
Jay Silver
Hector's clingfish

The Dart Harbour & Navigation Authority (DHNA) is a Trust Port responsible under United Kingdom law for the stewardship of Dartmouth Harbour.
 The Authority was formed in 1976 from the merger of the River Dart Navigation Commission and the Dart Harbour Commission which had been established in the 1880s.
 It was constituted under the Dart Harbour and Navigation Authority Act 1975, and The Dart Harbour and Navigation Harbour Revision (Constitution) Order 2002.
Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with patenting the first practical telephone and founding the American Telephone and Telegraph Company (AT&T) in 1885.
Baddeck, Nova Scotia is a village founded in 1908, with a history stretching back to early Mi'kmaq, French and British settlements.
 The village was home to Alexander Graham Bell and was witness to the first flight in the commonwealth with Bell's Silver Dart.
The Oionus I was a tetrahedral triplane built for Alexander Graham Bell It was the culmination of Bell's experiments with kites built at Baddeck, Nova Scotia.
 The aircraft's design combined those of the Aerial Experiment Association (AEA)'s AEA Silver Dart biplane and his AEA Cygnet kite.
 It was Bell's final aviation pursuit and Canada's first and only triplane design.
 The aircraft attempted a test flight in March 1910, but failed to achieve flight.
Clarence W. Dart, Sr. (6 December 1920 – 17 February 2012) was a World War II fighter pilot and member of the Tuskegee Airmen.
 During World War II, he flew a total of 95 missions, and was shot down twice, earning two Purple Hearts.
 He was also the recipient of the Air Medal and the Distinguished Flying Cross with four oak leaf clusters. Dart collectively, not individually, received a Congressional Gold Medal from President George W. Bush at a ceremony in Washington, D.C. on 29 March 2007.
 Dart died 17 February 2012 in Saratoga Springs, New York.
 He was 91.
The history of aviation in Canada begins with the first manned flight in a balloon at Saint John, New Brunswick in 1840.
 Development of the aviation industry in Canada was shaped by the interplay of Canadian national ambitions, national and international politics, economics, and technology.
 Experimental aviation started in Canada with the test flights of Bell's Silver Dart in 1909, following the epochal flight of the Wright Brothers in 1903.
 The experimental phase gave way to use of aircraft in warfare and many Canadians served in the British Royal Flying Corps and Royal Air Force during the First World War.
The Golden Hawks were a Royal Canadian Air Force (RCAF) aerobatic flying team established in 1959 to celebrate the 35th anniversary of the RCAF and the "Golden" 50th anniversary of Canadian flight, which began with the AEA Silver Dart in 1909.
The Silver Dart (or Aerodrome #4) was a derivative of an early aircraft built by a Canadian/U.
S. team, which after many successful flights in Hammondsport, New York, earlier in 1908, was dismantled and shipped to Baddeck, Nova Scotia.
 It was flown off the ice of Baddeck Bay, a sub-basin of Bras d'Or Lake, on 23 February 1909, making it the first controlled powered flight in Canada.
 The aircraft was piloted by one of its designers, John McCurdy.
 The original "Silver Dart" was designed and built by the Aerial Experiment Association (AEA), formed under the guidance of Dr. Alexander Graham Bell.
Jay Saul Silver is an electrical engineer and toy inventor (and hacker) from Cocoa Beach, Florida.
 Silver is the Founder and CEO of JoyLabz/MaKey MaKey and was the first-ever Maker Research Scientist at Intel.
Hector's clingfish, "Gastroscyphus hectoris", is a clingfish of the family Gobiesocidae, the only species in the genus Gastrocyathus.
 It is found all down the east coast of New Zealand around the low water mark amongst seaweed, on rocky coastlines.
 Its length is up to 6.4 cm SL.
 It is named after Scottish-born scientist James Hector.