Percy Pilcher
Encyclopedia
Percy Sinclair Pilcher (16 January 1866 – 2 October 1899) was a British inventor and pioneer aviator who was his country's foremost experimenter in unpowered flight at the end of the 19th Century. He was planning a flight with a motor-driven hang glider, but died in the crash of another glider before he could make the attempt.
for seven years from 1880. Thereafter he became an apprentice with the shipbuilders, Randolph, Elder and Company, of Govan in Glasgow.
Later that year Pilcher met Otto Lilienthal
, who was the leading expert in gliding in Germany. These discussions led to Pilcher building two more gliders, The Beetle and The Gull. Based on the work of his mentor Otto Lilienthal, in 1897 Pilcher built a glider called The Hawk with which he broke the world distance record when he flew 250 m (820 ft) at the grounds of Stanford Hall near Lutterworth
in Leicestershire, England.
Pilcher set his sights upon powered flight: he developed a triplane
that was to be powered by a 4 hp
(3 kW) engine; however, construction of the triplane put him heavily into debt, and Pilcher needed sponsorship to complete his work.
Pilcher formed a company with Walter Gordon Wilson
(later to become a successful motor engineer and inventor of the first tanks).
He is buried in Brompton Cemetery
, London.
' flight approached, a new effort was made to find the lost work, and some correspondence was found in a private American collection. From this it was possible to discern the general direction of his plans and the basis of his design. Based on Lilienthal's work, Pilcher understood how to produce lift using winglike structures, but at this time a full mathematical description was years away, so many elements were still missing. In particular, Pilcher was stuck trying to design a wing that could lift the weight of an engine, the aircraft itself and the occupant – each increase in wing area increased the weight so much that yet more lift was required, requiring a larger wing – a seemingly vicious circle. Pilcher's breakthrough, thanks to correspondence with another pioneer, Octave Chanute
, was to stack smaller, lighter wings one atop the other in an arrangement we know today as the biplane or triplane. This allowed the wings to generate much more lift without a corresponding increase in weight.
In 2003, a research effort carried out at the School of Aeronautics at Cranfield University
, commissioned by the BBC2 television series "Horizon", has shown that Pilcher's design was more or less workable, and had he been able to develop his engine, it is possible he would have succeeded in being the first to fly a heavier-than-air powered aircraft with some degree of control. Cranfield built a replica of Pilcher's aircraft and added the Wright brothers' innovation of wing-warping as a safety backup for roll control. Pilcher's original design did not include aerodynamic controls such as ailerons or elevator. After a very short initial test, the craft achieved a sustained flight of 1 minute and 25 seconds, compared to 59 seconds for the Wright Brothers' best flight at Kitty Hawk. This was achieved under dead calm conditions as an additional safety measure, whereas the Wrights flew in a 25 mph+ wind to achieve enough airspeed on their early attempts.
Early life
Percy Pilcher was born in Bath in 1866, and served in the Royal NavyRoyal Navy
The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...
for seven years from 1880. Thereafter he became an apprentice with the shipbuilders, Randolph, Elder and Company, of Govan in Glasgow.
Career
In 1891 Pilcher began work as assistant lecturer at Glasgow University and took a growing interest in aviation. He built a hang glider called The Bat which he flew for the first time in 1895; the Bat had a double use of the triangle control frame (TCF) as both a piloting device as well as an airframe part that doubled in kinposting utility.Later that year Pilcher met Otto Lilienthal
Otto Lilienthal
Otto Lilienthal was a German pioneer of human aviation who became known as the Glider King. He was the first person to make well-documented, repeated, successful gliding flights. He followed an experimental approach established earlier by Sir George Cayley...
, who was the leading expert in gliding in Germany. These discussions led to Pilcher building two more gliders, The Beetle and The Gull. Based on the work of his mentor Otto Lilienthal, in 1897 Pilcher built a glider called The Hawk with which he broke the world distance record when he flew 250 m (820 ft) at the grounds of Stanford Hall near Lutterworth
Lutterworth
Lutterworth is a market town and civil parish in the Harborough district of Leicestershire, England. The town is located in southern Leicestershire, north of Rugby, in Warwickshire and south of Leicester. It had a population of 8,293 in the 2001 UK census....
in Leicestershire, England.
Pilcher set his sights upon powered flight: he developed a triplane
Triplane
A triplane is a fixed-wing aircraft equipped with three vertically-stacked wing planes. Tailplanes and canard foreplanes are not normally included in this count, although they may occasionally be.-Design principles:...
that was to be powered by a 4 hp
Horsepower
Horsepower is the name of several units of measurement of power. The most common definitions equal between 735.5 and 750 watts.Horsepower was originally defined to compare the output of steam engines with the power of draft horses in continuous operation. The unit was widely adopted to measure the...
(3 kW) engine; however, construction of the triplane put him heavily into debt, and Pilcher needed sponsorship to complete his work.
Pilcher formed a company with Walter Gordon Wilson
Walter Gordon Wilson
Major Walter Gordon Wilson was an engineer and member of the British Royal Naval Air Service. He was credited by the 1919 Royal Commission on Awards to Inventors as the co-inventor of the tank, along with Sir William Tritton....
(later to become a successful motor engineer and inventor of the first tanks).
Death
On 30 September 1899, having completed his triplane, he had intended to demonstrate it to a group of onlookers and potential sponsors in a field near Stanford Hall. However, days before, the engine crankshaft had broken and, so as not to disappoint his guests, he decided to fly the Hawk instead. The weather was stormy and rainy, but by 4 pm Pilcher decided the weather was good enough to fly. Whilst flying, the tail snapped and Pilcher plunged 10 metres (30 ft) to the ground: he died two days later from his injuries with his triplane having never been publicly flown.He is buried in Brompton Cemetery
Brompton Cemetery
Brompton Cemetery is located near Earl's Court in South West London, England . It is managed by The Royal Parks and is one of the Magnificent Seven...
, London.
Legacy
A stone monument to him stands in the field near Stanford Hall at the point where he crashed, and a full-sized replica of his "The Hawk" glider is also displayed at Stanford Hall. The original Hawk has survived and is in the collections of National Museums Scotland.Renewal of interest
Pilcher's plans were lost for many years, and his name was also long forgotten except by a few enthusiasts. When the centenary of the Wright brothersWright brothers
The Wright brothers, Orville and Wilbur , were two Americans credited with inventing and building the world's first successful airplane and making the first controlled, powered and sustained heavier-than-air human flight, on December 17, 1903...
' flight approached, a new effort was made to find the lost work, and some correspondence was found in a private American collection. From this it was possible to discern the general direction of his plans and the basis of his design. Based on Lilienthal's work, Pilcher understood how to produce lift using winglike structures, but at this time a full mathematical description was years away, so many elements were still missing. In particular, Pilcher was stuck trying to design a wing that could lift the weight of an engine, the aircraft itself and the occupant – each increase in wing area increased the weight so much that yet more lift was required, requiring a larger wing – a seemingly vicious circle. Pilcher's breakthrough, thanks to correspondence with another pioneer, Octave Chanute
Octave Chanute
Octave Chanute was a French-born American railway engineer and aviation pioneer. He provided the Wright brothers with help and advice, and helped to publicize their flying experiments. At his death he was hailed as the father of aviation and the heavier-than-air flying machine...
, was to stack smaller, lighter wings one atop the other in an arrangement we know today as the biplane or triplane. This allowed the wings to generate much more lift without a corresponding increase in weight.
In 2003, a research effort carried out at the School of Aeronautics at Cranfield University
Cranfield University
Cranfield University is a British postgraduate university based on two campuses, with a research-oriented focus. The main campus is at Cranfield, Bedfordshire and the second is the Defence Academy of the United Kingdom based at Shrivenham, Oxfordshire. The main campus is unique in the United...
, commissioned by the BBC2 television series "Horizon", has shown that Pilcher's design was more or less workable, and had he been able to develop his engine, it is possible he would have succeeded in being the first to fly a heavier-than-air powered aircraft with some degree of control. Cranfield built a replica of Pilcher's aircraft and added the Wright brothers' innovation of wing-warping as a safety backup for roll control. Pilcher's original design did not include aerodynamic controls such as ailerons or elevator. After a very short initial test, the craft achieved a sustained flight of 1 minute and 25 seconds, compared to 59 seconds for the Wright Brothers' best flight at Kitty Hawk. This was achieved under dead calm conditions as an additional safety measure, whereas the Wrights flew in a 25 mph+ wind to achieve enough airspeed on their early attempts.