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Aviation History
1911
1911 - 0195.PDF
MARCH II, 191 I. [/yGHT] THE CHAUVIERE PROPELLER-TESTING PLANT. IT is generally recognised that static thrust tests of propellers afford data that is of doubtful value as an indication to their operation in flight, and devices for testing propellers in motion have therefore a prima facie claim to the interest of our readers. Messrs. Chauviere, whose propellers are so popular, and whose agent in Great Britain is Mr. G. W. Goodchild, of 30-32, Farringdon Road, E.C., have installed the motor car plant for testing their propellers which is illustrated by the accompanying photograph, and is thus described in the Genie Civil by Lieut.-Col. Espitallier:— At the end of the car a strong structure of sufficient height for mounting a propeller of up to 12 ft. diameter is arranged. A chain-drive allows the 70-h.p. motor either to work on the car-shaft or on the propeller-shaft, or on both simultaneously. In the event of the propeller being of a large diameter, the air-pressure caused by its motion will be sufficient to start the car and to give it a proper speed, which can be increased by driving down hill. Since small-sized propellers are incapable of absorbing all the power developed by the engine, it may be necessary to transmit part of it direct on to the wheels of the car in order to move the car. Thereafter it is sufficient to record by means of an odograph the speed of the car and simultaneously through other devices the number of revolutions of the propeller-shaft, the pressure •of the propeller in the direction of its axis and also the amount •of the torque. These latter measurements are the most difficult to make. For recording the thrust, the propeller-shaft, which is supported in such a way as to allow some slight movement, is resting against a flexible membrane of an apparatus similar to the pressure regulators used especially in steam-heating plants. This diaphragm forms an air-chamber and is held between two discs serving as the abutment for the shaft. It operates by its movement in either direction two valves on a compressed air system. The thrust of the propeller pushes the membrane inwards .and the compressed air enters the chamber until its pressure balances the propeller-thrust. As soon as this condition is achieved, the air supply is cut off. It is evident, therefore, that the shaft will oscillate slightly about its central position. Moreover, at the moment the thrust is balanced by the pressure of the air it is sufficient to record this pressure by using a manometer. A similar attachment may be easily applied for recording the torque which tends to move the system of bearings in a direction opposite to that of the propeller. Thus the whole system can oscillate in all directions, which is important in view of the necessity to obtain absolute freedom of motion. The propeller is actuated by a set of bevel-gears and the main-engine shaft is fitted with a cardan drive ; but the outer end of this shaft being necessarily affected by the variations of speed of the forward end, it would not be possible to fix the sprocket wheel for the driving-chain to this shaft. This wheel is, therefore, mounted on an independent hollow shaft which runs in fixed bearings. The shaft with the cardan - joint passes through this tube and is rotated by means of a special flexible coupling. It was also foreseen that the variations in the spaed of the car and the jolts, caused by the irregularity of the road. would cause shocks to the shaft that might influence the diaphragm in such a way as to make the readings of the pressure-gauge unreliable. In order to overcome this, a counterweight equivalent to that of the propeller and the parts which rotate in connection therewith has been pro vided, and this counterweight moves in the opposite direction. LIST OF NEW PILOT AVIATORS (FRANCE). „ ICoun-Name. try Bonzon (Maurice) .. ..Fr. liergognic (Charles) .. .. „ Benoist (Jean) ,, Cei (Joseph) It. Carles (F-n.and) .. .. Fr. Contour (Ernest) .. ..: „ Chaussier (Pierre) .. . ,, Chevillard (Matrice) .. .. „ Collardeau(Gto.) .. .. „ Chaunac-Lanzac (de) .. .. ,, Delagrange (Robert) .. .. ,, Deroye (Francois) Deruissy (Anare) .. .. ,, Denis (-^ugusle) .. ..In Frantz (Joseph) .. .. „ Fiorelhno( ouis) .. .. ,, Frugier (Leon) .. .. ,, Coys de Mereyrac (Louis) .. i ,, Grandseigue (Robert) . ; ,, Grellct (Alexis) .. .. „ (.'.ouguenheim (Pierre) .. „ Gasnier (Pierre) .. • ,, •Gassier (Marcel) .. .. >, Date of Birth. Where Born. 15 Au., 90 Lyons 22 Se., 81 Maisons- Laffitte 10 Se., 91 Bugeaud (Alg.) 3 Au , S4 Valentigney 25 Ja., 89 Cascina 11 Fe., 86 Marseilles 19 Se., 83 Semur 24 Ma., 76 Douai 25 Au., 87 Courteray 22 Ap., 86 Bordeaux 23 Ju., 72 Champcev- reuil 26 Jy., 70 Orleans 26 Jy , 84 Arnay-le- Duc 7 De., 83 Laventie 30 No., 76 Etin 7 Au., 90 Beaujeu 14 Jy-, S3 Nice _ 22 My., 79 Villebois 23 Ap., 76 Lyons 25 Se., 85 Havre 7 Ma., 74.St. Etienne 19 Ap., 92 Paris 16 Se. ,76 Bouchemair 3 Ja-. 74 Marseilles Machine 'H. Far. Som. Modi fied Vois Han. Cau. Som. ,, Breg. Han. Modi fied Far. R.E.P. Han. H. Far. Breg. Koe. fi Ant. H. Far. BL Cau. Bl. H. Far. Bl. Modi fied Far. Qualified 3 Fe., 11 " " ,, ., ,, ,, ,, ,, " — 3Fe., 1. » „ n ,, ,, ,, ,, ,1 », ,, „ " V. IS5 173 j6Q 395 .m 362 -' 384 ^ 393 394 366 174 376 -•i. • .,63 369 378 334 560 S7° ;88 391 19* En* 6 Ap., 85 iValentigney Han. 3 Fe., 11 27 Se., 84 !Poitiers „ ., 25 Jn , 89 London Mor. ,, 26 Jn. ,84 Paris Han. ,, r2jn.,67 Vaite „ ,, 26 De., 84 Paris 111. 26Ma.,85L>ie .Som. 30 Ap., 76 St. Dizier Han. 4 De., 70 Marseilles Som. 3 Ja., 7s Paris „ 1 Ju., 79 [Marseilles H. Ft 22 v c.| 74 Loulans-les- Ttl. Forges 7 Fe., 7* SParis H. Far. j ,, 12 Ja., 76 ISt. Andre- Bl. „ du Hois 1 Jy., 86 .Montpellier Sav. ,, 24 Ma.,74'Luetic- jNieu. ,, Fringe y Jy., 76 St. Malo HI. 26 My., 79 Paris Som. ,, 20 My., 86'Abbeville Sav. ,, 25 Ja., 83 Aix-les- HI. „ l'.aii.s 29 Ap, 86 Angers Han. ,, 8 Ma., 87 Nancay ,, ,, 18 Ma., 9o|St. Lac- Modi- ! „ tencin fied Vois 17 Ju., 74 Zululand H. Far. ! „ England ; Fr. = France ; It. = Italy. Machine— Ant. = Antoinette; Bl. = BIeriot; Breg. = Bregiiet ;Cau =Caudron Han. = Hanriot; H. Far = Henry Farman ; Koe.= Koechlin ; Mor. = \l. HUM Nieu. — Nieuport ; R.E.P. = k. Esnault-Pelterie ; Sav. = Savary ; Som, = Sommer ; Tel. = Tellier; Vois. = Voisin. , Goux (Jules) Fr. Grailly (Jacques) Hamel (Gustav) Houlette (Andre) Hanriot (Ren;) ..I ,, Kergariou (Kdgard de) ..I ,, Leyat (Marcel) •• . ! ,, Lenfant (Lf uis) .. .. ., Magneval (Gabriel) .. ..'• „ Martin (Kdouard) .. ...,, Magnan (Leon) .. ..!,, Nissole (Edouard) .. ..I „ Osmon* (Geo.) .. .. ..[„ Ors (Jean) ,, Palade (Antoine) .. .. ,, Pommier (Marin) ; ,, Raoblt (Jean) Reimbert (Ernest) .. .. „ Reichert (Henri) .. .. ,, Rivollier (Jean) ., ..;,, Renaud de la F'regeolifire .. ,, Tixier (Henri) „ Verrier (Pierre) Wetton (Maximillian) .. I Af. Country—Af. = Africa ; Eng. 197
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