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Aviation History
1925
1925 - 0073.PDF
FEBRUARY 5, 1925 THE BRISTOL "JUPITER" 100-HOUR TYPE TEST FROM time to time we have published in FLIGHT reports on various tests that have been carried out with the Bristol " Jupiter " 400 h.p. radial air-cooled aero engine. (See FLIGHT for April 24, October 2, October 16, 1924, and January 8, 1925.) On each occasion this remarkable engine has improved on its previous performance, and now once again we have received some brief particulars of another big test from which the " Jupiter " has emerged with success. We find ourselves asking the question : What can be coming next ? This latest achievement of the Bristol " Jupiter " is the completion of the new 100-hour Air Ministry type test. Perhaps the outstanding feature of this test is the fact that although the engine—No. JX 1000—had run for 77 hours before the tests were commenced, the power curve showed an increase in performance at the end of the test as com- pared with the beginning. Also, the test was carried out at a rated h.p. of 425, while at the end of the test the engine was stripped and its condition was found to be excellent. We reproduce herewith the power curve taken on this test, from which.our readers can obtain the main characteristics of the run. The following, however, is a synopsis of the test, and a few further details as regards fuel consumption, etc. The engine was run :—-1J hours on Froude (1st power curve) ; 40 hours on Froude (383 B.H.P.—90 per cent.— at 1,650 r.p.m.) ; 50 hours on hangar (383 B.H.P.—90 per cent—at 1,650 r.p.m.) ; 9 hours on Froude (383 B.H.P.— 90 per cent.—at 1,650 r.p.m.) ; 1 hour on Froude (429 B.H.P. at 1,650 r.p.m.) ; 1 hour on Froude (304 B.H.P. at 1,820 r.p.m.) : 1 hour on Froude (466 B.H.P. at 1,825 r.p.m.) ; 1 J hours on Froude (2nd power curve) ; total running time, 105 hours. Details of the 100-hour test at 1,650 r.p.m. are as follows : Run. 1 2 3 4 5 6 7 8 9 10 Hours,non-stop. 10Id 10 37* 10 1<> 10 10 10 lot H.P.at end. 418 419-5 416 421-3 Hangar 429 Fuel,gals. 277 278 275 277 275 280 275 275 275 2 0 Consumptions.Fuel. gals. p. hr. 27-727-8 275 277 27-5 28 27-5 275 275 28 Oil,pints. 144 146 131 142 155 135 120 110 112 80 Oil,pts. p. hr. 14-414 6 131 142 155 13 5 12 11 112 8 R.P.M. 1200 1300 1400 1500 1600 1700 1800 1900 "n is a120 Q 490 480 4-10 460 4-SO 44.0 430 •*20 ffl 410 400 390 3S0 370 360 3S0 7 = AII SB t y j /Af y A "Ifv/ f > r CD 'CD 1200 1300 1400 1500 1600 1700 1S00 '900 R.P.M * Test-stand breakdown. | Last hour full throttle. The total consumptions for the 100 hours was 2,767 gallons of fuel and 1,259 pints of oil ; the average pints per B.H.P. BRISTOL "JUPITER" 100-HOUR TYPE TEST: Power curves. (1) Taken before test. (2) Taken after test. Barometer, 29.94 : 5 mins.-readings. per hour was 0-578 fuel and 0-033 oil. There was no falling off in power during the run, on the final power curve at the conclusion of the 100-hour test the engine developing 435 B.H.P. at 1,650 normal r.p.m., and 473 B.H.P. at 1,825 maximum r.p.m. The Paris-Dakar Non-Stop Flight ALL preparations are now complete for the non-stop flight from Paris to L>akar, which is to be attempted by the two French officers, Captain Lemaitre and Lieut. Arrachard. The distance is approximately 2,610 miles, and will, it is expected, occupy about 25 hours. The machine to be used is a Breguet XIX A.2, similar to that used by Pelletier d'Oisy on his Paris-Tokio flight, but the engine fitted for the flight to Africa is a 480 h.p. Renault. Specially large petrol tanks have been fitted, with a total capacity of 2,300 litres (506 gallons), which, it is estimated, should suffice for about 26 hours' flying. Much will, of course, depend upon weather conditions, as a slight following wind would be of the greatest assistance. In fact, if the two gallant aviators were to meet with head winds for any length of time the flight would be impossible. The start will probably be made from Etampes (Villesauvage), and the route to be followed is as follows : Etampes, Biarritz, Lisbon, Tangier, Casablanca, Cape Juby, Port Etienne, Saint Louis, and Dakar. Should the complete flight planned be found impossible for any reason the aviators will attempt at least to reach Port F.tienne, a distance of more than 3,000 kms. (1,865 miles). " Aripa " AVIATION in Roumania is making rapid progress, both in the military and the commercial branches, but up to now this country has not possessed a journal devoted solely to aviation. Readers of FLIGHT will be interested to learn that, thanks to the efforts of a group composed of well-known Roumanian pilots and aeronautical engineers, Roumania is about to produce a weekly—probably bi- or tri-weekly later on—aviation journal, known as Aripa, which will be I devoted to the interests of aviation, aviators, and the industry in Roumania. We take this opportunity of wishing our allied contemporary a hearty welcome. Air Service to Ireland Ax air service to Ireland will be operated this year by Northern Air Lines, Ltd., commencing on March 3. The service will run between Carlisle and Belfast, except during the winter months, when the terminus on the English side will be Stranraer. The chief pilot will be Capt. R. Mackintosh, and one D.H.50 and two D.H.9's will be employed. Aerial Survey in Canada FOLLOWING on the successful extensive aerial survey of the Reindeer Lake District, north of Manitoba and Saskatche- wan, carried out last year, the Royal Canadian Air Force will make further surveys this year. As a result of these aerial surveys the Government will have reliable maps of all the territory in this part of Canada from Hudson's Bay to the Churchill River source. French Aero Engine Works Closed OWING, it is stated, to the failure of the French Govern- ment to pass an order, promised last year, for 50 engines, the Salmson factory has had to close down, thereby throwing some 2,500 men out of employment. Brussels-Congo Flight THE three-engined Handley Page biplane (one RoU ^•°X£e *^=iy&fc anc^ *wo Siddeley " Pumas "), on which $fr¥Ei4ftry" wffl attempt to fly from Brussels to Belgian Congo (probably starting this week), was christened on Febru- ary 3, at Evere Aerodrome,, by Princess Marie-Jose. 73 -.,.-. v ,1.,.^;,
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