We bring you our story on aviation pioneer Geoffrey Terence Roland Hill (1895–1955), raised near Enagh Lough in County Derry/Londonderry. Encouraged by his mathematician father, Hill began building prize-winning model aircraft as a boy. After service as a pilot in the Royal Flying Corps during the First World War, he became a test pilot, a world altitude record-setter and the designer of the tailless Westland-Hill Pterodactyl series. He later worked with Short Brothers in Belfast on the aero-isoclinic SB.4 S.H.E.R.P.A. His research helped shape the principles behind modern flying wing aircraft, including the Northrop Grumman B-2 Spirit.
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WW1 AND A WORLD RECORD
Growing up near Enagh Lough in County Derry Londonderry, Geoffrey and his younger brother Roderic built a model aircraft for the 1912 Children’s Exhibition at the Olympia Centre in London, followed soon after by an almost successful full sized glider. Hill studied at University College London, graduating with a Bachelor of Science in 1914 and joined the Royal Aircraft Factory as a graduate apprentice.
By 1916 he had learned to fly and was testing aircraft at the Royal Aircraft Factory. Commissioned into the Royal Flying Corps as a second lieutenant, he later served in France with No. 29 Squadron. He received the Military Cross in late 1916 and in January 1917 was promoted to temporary captain. After being invalided home, he returned to test flying and by 1918 was in command of the Aerodynamics Flight at the Royal Aircraft Establishment (RAE).
After the war Hill joined Handley Page as chief test pilot and aerodynamicist. In 1919 he flew the new Handley Page W.8 airliner to almost 4,300 metres, setting a world record for an aircraft with an all-up weight of 1,500 kilograms. The W.8, an early British commercial airliner, was powered by two Rolls-Royce Eagle engines of around 360 hp each. A large fabric-covered biplane with a two-bay wing structure, it carried twelve passengers in an enclosed cabin, cruised at about 145 km/h and had a range of more than 640 kilometres. Hill’s record-setting ascent demonstrated its performance ceiling and commercial potential.
TAILLESS PTERODACTYL
Determined to reduce stall and spin accidents, Hill set out to design a safer aircraft. Influenced by the stability research of J. W. Dunne, he created a tailless design with natural low-speed control. With help from his wife, he built the first Pterodactyl (pronunciation: teh·ruh·dak·tl) glider in 1924 and fitted it in 1925 with a 35 hp Bristol Cherub engine for trials at Farnborough – attracting official interest.
Hill shaped the aircraft to resist sudden stall. The wings were slightly swept and tapered, the fuselage was short, and there was no tailplane. Built-in wing twist reduced the angle at the tips, maintaining stable pitch forces and giving controllability at slow speeds or with the nose raised. A wide wing root improved pilot visibility.
Successful flights at Farnborough and at the 1926 RAF Display led to Hill’s appointment as tailless aircraft designer at Westland. Military versions were tested, and the tailless configuration produced an exceptionally wide field of fire for the rear gunner. The programme ended in 1932 when Hill became Professor of Engineering Science at the University of London.
WW2 BARRAGE BALLOONS
In 1939 Hill was seconded to the Air Ministry and the Ministry of Aircraft Production for research, including scientific liaison with the United States and Canada. That same year he led a project at Pawlett, Somerset, to develop ways of cutting the cables of enemy barrage balloons so that British aircraft might survive cable impacts, which earlier trials had shown could cause catastrophic damage.
Aircraft assigned to the cable-cutting programme included the Fairey P.4/34 prototype K5099, the Vickers Virginia J7130, the Vickers Wellesley L2716, three Fairey Battles and a Handley Page Harrow. Late in the war Hill served as British Scientific Liaison Officer in Canada and proposed a tailless research glider that flew from 1946 to about 1950.
SHORT BROTHERS
After the war Hill joined Short Brothers and Harland in Belfast as chief aeronautical consultant. His work addressed a growing problem in high-speed aviation: thin, swept wings on jet aircraft tended to twist and bend under aerodynamic load. This flexing altered the wing’s angle of incidence, affecting stability, especially near transonic speeds.
In 1951 Hill proposed the aero-isoclinic wing, designed to maintain constant angle of incidence even when the main wing was bending. About one fifth of each wingtip acted as a rotating surface. These tips served as elevators or ailerons and because they were separate from the main wing, they kept their control setting even when the rest of the wing flexed.
Working with Short Brothers designer David Keith Lucas, Hill brought the idea into practice with the experimental SB.4 S.H.E.R.P.A. (Short & Harland Experimental Research Prototype Aircraft), which first flew in 1953. Tests showed that rotating tips countered wing twist and improved roll and pitch response. Though the system remained experimental, it advanced the understanding of flexible swept wings and informed later flying-wing stealth research.
More than sixty years before the B-2 flew, Hill’s Pterodactyl had proven that a tailless aircraft could be stable, controllable and resistant to stall without a tailplane. His research into wing twist, sweep and centre of pressure laid crucial groundwork long before electronic flight control systems made large flying wings feasible.
Although the Pterodactyl series never reached production, it established early aerodynamic principles for tailless aircraft. The B-2, produced by Northrop for the US Air Force, used composites, digital control and stealth shaping, but its core aerodynamic logic followed the path Hill explored in the 1920s.
Geoffrey Hill retired from Short Brothers in 1954 as a Fellow of the Aeronautical Society. He died in Derry/Londonderry in 1955, leaving a legacy that continues to influence high-performance stealth aircraft design today.
If you have an idea for a story, please email Kevin Reid [email protected]
Sources of Information, Video & Photo Credits:
Balloon Barrage Reunion Club – ‘Pawlett Barrage Balloon Hangar’ – An Interview with Tom Flack
Come Fly With the B-2 Spirit Stealth Bomber – Northrop Grumman
Derry Journal
Derry Volume III: The Lady in Black – Ken McCormack
DroneScapes
Graces Guides
Weird Wings
WIKI
