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101 Martin, Sir James
SUBJECT AREA: Aerospace[br]b. 1893 Co. Down, Northern Irelandd. 5 January 1981 England[br]Irish military aircraft engineer, inventor of the ejector seat.[br]Martin acquired a general knowledge of engineering as an industrial worker in Belfast. In 1929 he established the Martin Aircraft Company, which was merged five years later with another concern to form the Martin-Baker Aircraft Company at Denham, Buckinghamshire. They became known for designing and constructing efficient, lightweight military aircraft, and Martin supervised personally every aspect of the work of his factory. During the Second World War they developed a number of aircraft weapons, including an explosive device carried on a bomber's wings for cutting the cables of barrage balloons, the flat-feed system for the 20 mm Hispano cannon used on British fighter planes and the twelve-gun pack mounted in the nose of the Havoc night fighter. Martin began devising means of rapid escape from a disabled fighter plane. First came a quick-release canopy for the Spitfire, followed by an improved form sliding on guides set in the fuselage. Then came the Martin-Baker seat, which ejected the pilot from his plane by an explosive charge. Ground tests were made to determine the rates of acceleration that could be tolerated by the pilot, and the first test in the air with a pilot took place in July 1946 at a speed of 320 mph (515 km/h) and an altitude of 8,000 ft (2,400 m). Its first use in a genuine emergency was in May 1949.After the Second World War, the firm specialized in making components, particularly the ejector seat, rather than complete aircraft. The higher speeds and altitudes of supersonic jet aircraft made it necessary to modify the ejector seat: a device to hold the pilot's legs together, to prevent their being broken, was incorporated. In addition, with the Institute of Aviation Medicine, Martin developed a face blind to prevent skin damage at low temperatures. Another modification was to allow the seat to fall freely for the first 10,000 ft (3,000 m) to enable the pilot to reach breathable air more quickly; in October 1959 a successful demonstration took place at 1,250 mph (2,000 km/h) and 40,000 ft (12,000 m) altitude. During the inventor's lifetime, it is estimated that his ejector seat saved the lives of some 4,700 airmen.[br]Principal Honours and DistinctionsKnighted 1965. Barbour Air Safety Award 1958. Cumberbatch Air Safety Trophy 1959. Royal Aero Club Gold Medal 1964.Further ReadingObituary, 1981, The Times.LRD -
102 Renard, Charles
SUBJECT AREA: Aerospace[br]b. 23 November 1847 Damblain, Vosges, Franced. 13 April 1905 Chalais-Meudon, France[br]French pioneer of military aeronautics who, with A.C.Krebs, built an airship powered by an electric motor.[br]Charles Renard was a French army officer with an interest in aviation. In 1873 he constructed an unusual unmanned glider with ten wings and an automatic stabilizing device to control rolling. This operated by means of a pendulum device linked to moving control surfaces. The model was launched from a tower near Arras, but unfortunately it spiralled into the ground. The control surfaces could not cope with the basic instability of the design, but as an idea for automatic flight control it was ahead of its time.Following a Commission report on the military use of balloons, carrier pigeons and an optical telegraph, an aeronautical establishment was set up in 1877 at Chalais-Meudon, near Paris, under the direction of Charles Renard, who was assisted by his brother Paul. The following year Renard and a colleague, Arthur Krebs, began to plan an airship. They received financial help from Léon Gambetta, a prominent politician who had escaped from Paris by balloon in 1870 during the siege by the Prussians. Renard and Krebs studied earlier airship designs: they used the outside shape of Paul Haenlein's gas-engined airship of 1872 and included Meusnier's internal air-filled ballonnets. The gas-engine had not been a success so they decided on an electric motor. Renard developed lightweight pile batteries while Krebs designed a motor, although this was later replaced by a more powerful Gramme motor of 6.5 kW (9 hp). La France was constructed at Chalais-Meudon and, after a two-month wait for calm conditions, the airship finally ascended on 9 August 1884. The motor was switched on and the flight began. Renard and Krebs found their airship handled well and after twenty-three minutes they landed back at their base. La, France made several successful flights, but its speed of only 24 km/h (15 mph) meant that flights could be made only in calm weather. Parts of La, France, including the electric motor, are preserved in the Musée de l'Air in Paris.Renard remained in charge of the establishment at Chalais-Meudon until his death. Among other things, he developed the "Train Renard", a train of articulated road vehicles for military and civil use, of which a number were built between 1903 and 1911. Towards the end of his life Renard became interested in helicopters, and in 1904 he built a large twin-rotor model which, however, failed to take off.[br]Bibliography1886, Le Ballon dirigeable La France, Paris (a description of the airship).Further ReadingDescriptions of Renard and Kreb's airship are given in most books on the history of lighter-than-air flight, e.g.L.T.C.Rolt, 1966, The Aeronauts, London; pub. in paperback 1985.C.Bailleux, c. 1988, Association pour l'Histoire de l'Electricité en France, (a detailed account of the conception and operations of La France).1977, Centenaire de la recherche aéronautique à Chalais-Meudon, Paris (an official memoir on the work of Chalais-Meudon with a chapter on Renard).JDS -
103 مد
مَدَّ \ extend: to make longer or wider (a fence, a garden, a building, etc.). hold out: to offer (for sb. else to take): He held out his plate for some food. lay: to put down; place; set: They were laying pipes for a new water supply. prolong: to make longer, in time: We prolonged our holiday. spread: to unfold; stretch; cause sth. to cover a certain area (or a certain period): She spread a cloth over the table. The bird spread its wings. He spread some butter on his bread. stretch: to straighten one’s body (after sleep, or so as to reach sth.): If you stretch (your arm), you can reach the top shelf. The dog woke up and stretched (itself). \ See Also بسط (بَسَطَ)، أطال (أَطَالَ) \ مَدَّ \ splay: to spread outwards or be spread outwards. \ See Also امتد (اِمْتَدّ) \ مَدَّ \ man: to supply with men, for service or defence: The hospital telephones are manned day and night. \ See Also زَوَّدَ بالرِّجال \ مَدَّ \ staff: to supply with workers: She staffed her office with three men. \ See Also زَوَّد بالعاملين \ مَدَّ يَدَ المُسَاعَدَة \ lend a hand: to help: Would you lend me a hand with moving this big table? Lend him a hand with counting that money. \ مَدَّ يَدَه لِيَصل إلى \ reach for: to stretch out one’s hand towards: He reached for my throat, but I sprang back. -
104 extend
مَدَّ \ extend: to make longer or wider (a fence, a garden, a building, etc.). hold out: to offer (for sb. else to take): He held out his plate for some food. lay: to put down; place; set: They were laying pipes for a new water supply. prolong: to make longer, in time: We prolonged our holiday. spread: to unfold; stretch; cause sth. to cover a certain area (or a certain period): She spread a cloth over the table. The bird spread its wings. He spread some butter on his bread. stretch: to straighten one’s body (after sleep, or so as to reach sth.): If you stretch (your arm), you can reach the top shelf. The dog woke up and stretched (itself). \ See Also بسط (بَسَطَ)، أطال (أَطَالَ) -
105 hold out
مَدَّ \ extend: to make longer or wider (a fence, a garden, a building, etc.). hold out: to offer (for sb. else to take): He held out his plate for some food. lay: to put down; place; set: They were laying pipes for a new water supply. prolong: to make longer, in time: We prolonged our holiday. spread: to unfold; stretch; cause sth. to cover a certain area (or a certain period): She spread a cloth over the table. The bird spread its wings. He spread some butter on his bread. stretch: to straighten one’s body (after sleep, or so as to reach sth.): If you stretch (your arm), you can reach the top shelf. The dog woke up and stretched (itself). \ See Also بسط (بَسَطَ)، أطال (أَطَالَ) -
106 lay
مَدَّ \ extend: to make longer or wider (a fence, a garden, a building, etc.). hold out: to offer (for sb. else to take): He held out his plate for some food. lay: to put down; place; set: They were laying pipes for a new water supply. prolong: to make longer, in time: We prolonged our holiday. spread: to unfold; stretch; cause sth. to cover a certain area (or a certain period): She spread a cloth over the table. The bird spread its wings. He spread some butter on his bread. stretch: to straighten one’s body (after sleep, or so as to reach sth.): If you stretch (your arm), you can reach the top shelf. The dog woke up and stretched (itself). \ See Also بسط (بَسَطَ)، أطال (أَطَالَ) -
107 prolong
مَدَّ \ extend: to make longer or wider (a fence, a garden, a building, etc.). hold out: to offer (for sb. else to take): He held out his plate for some food. lay: to put down; place; set: They were laying pipes for a new water supply. prolong: to make longer, in time: We prolonged our holiday. spread: to unfold; stretch; cause sth. to cover a certain area (or a certain period): She spread a cloth over the table. The bird spread its wings. He spread some butter on his bread. stretch: to straighten one’s body (after sleep, or so as to reach sth.): If you stretch (your arm), you can reach the top shelf. The dog woke up and stretched (itself). \ See Also بسط (بَسَطَ)، أطال (أَطَالَ) -
108 spread
مَدَّ \ extend: to make longer or wider (a fence, a garden, a building, etc.). hold out: to offer (for sb. else to take): He held out his plate for some food. lay: to put down; place; set: They were laying pipes for a new water supply. prolong: to make longer, in time: We prolonged our holiday. spread: to unfold; stretch; cause sth. to cover a certain area (or a certain period): She spread a cloth over the table. The bird spread its wings. He spread some butter on his bread. stretch: to straighten one’s body (after sleep, or so as to reach sth.): If you stretch (your arm), you can reach the top shelf. The dog woke up and stretched (itself). \ See Also بسط (بَسَطَ)، أطال (أَطَالَ) -
109 stretch
مَدَّ \ extend: to make longer or wider (a fence, a garden, a building, etc.). hold out: to offer (for sb. else to take): He held out his plate for some food. lay: to put down; place; set: They were laying pipes for a new water supply. prolong: to make longer, in time: We prolonged our holiday. spread: to unfold; stretch; cause sth. to cover a certain area (or a certain period): She spread a cloth over the table. The bird spread its wings. He spread some butter on his bread. stretch: to straighten one’s body (after sleep, or so as to reach sth.): If you stretch (your arm), you can reach the top shelf. The dog woke up and stretched (itself). \ See Also بسط (بَسَطَ)، أطال (أَطَالَ)
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