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William Francis Forbes-Sempill, 19th Baron Sempill, 10th Baronet Forbes of Craigievar (24th September 1893 – 30th December 1965) was a British engineer. Before succeeding his father to the titles of Lord Sempill and Baronet Forbes in 1934, he was known by his courtesy title, Master of Sempill.
Forbes-Sempill was involved in the aircraft industry from its early days, both as a flyer and as an engineer. During World War I, he enrolled in the Royal Flying Corps; by the end of the war he held the rank of colonel.
He became a test pilot and transferred into the Royal Naval Air Service.
In 1921 he led a British deputation to Japan, to assist the Japanese navy in setting up its new air base.
Flew a glider to Stockholm
Crashed in the jungle while attempting to fly to Australia
1926. Flew a De Havilland Moth to Dublin to prove a light aircraft could survive in heavy weather.
During World War II he served in the Fleet Air Arm.
Lord Sempill was a leading figure in the Royal Aeronautical Society, of which he was president, and advised overseas governments, including that of Australia, on the creation of their air forces.
On his death, his titles were split; his daughter Ann inherited the barony, as this title was able to be passed down the female line, but the baronetcy passed to his younger brother, Ewan.