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Aviation History
1917
1917 - 0582.PDF
JUNE 14, I91?- U.S. NAVY TEST OF 3OO H.P. RNOX AERO ENGINE. THE following extracts from the official report on the U.S. Navy tests of the 300 h.p. Knox aero engine should be of interest. The tests, which were passed successfully by the engine, consisted of :—(1) A run for determining the points of a horse power-revolution per minute curve. (2) A run fully equipped with electric starter, two-cycle air pump for petrol feed, &c. The total weight of the engine is 1,430 lbs., 47 per cent, of which weight is accounted for by a special aluminium alloy. In the first test the following readings were obtained, from which the curve shown in Fig. 1 was plotted :— End view of the 300 h.p. Knox engine. of six hours at rated load and speed. (3) Engine entirely disassembled, inspected and measured, and then reassembled. (4) A further run of 1 hour after reassembling. "The tests were carried out in the research laboratory of the Knox Motors Co. of Springfield, Mass. The engine is a 12-cylinder water-cooled V of 4|-in. bore by 7 in. stroke, with gear reduction drive to the propeller, and MotorR.P.M. 1217 • 13501605 1797 2039 2247 2390 PropellerR.P.M. 73° 810 960 1086 1224 1340 1428 H.P 235 ' 255 • 308 322 347 353346- 5 - 5 The readings obtained during the six-hour lows :— Time H.M. 00 15 3O 45t:oo 1:15 1:30 i:452x10 2:15 2:30 2:45 3:00 3:iS 3:30 3:45 4:00 4:15 4:30 4:45 5:00 5:i5 5:30 5=45 • 6:00 Motor R.P.M. 1807 1820 1824, 1815 1807 1794 1810 1831 1786 1793 1789 1809 1795 1840 1811 1864 1815 1814 1829 1810 1890 1869 1845 1838 1892 - " ,." Oil H.P. Pressure 3O7 309" s - 3!O 309 3°7 3OS 3O7"53"'5 3O3'5 305 3°4 307 "5 3O5 3"-5308 317 306-5 308-5 237 287 306*5 3O4'5 3O7 304 315 75 7O 60 60 60 60 60 60 62 68 64 62 61 60 61 62 61 62 65 65 61 60 61 60 60 Water Inlet 106 102 104 104 no 106 106 88 100 103 64 91 98 96 92 100 100 102 100 100 103 IOI 98 98 94 TorqueFt. Lbs. 1685 1655 I7I5 ~ 1565 1485 1375 1265 run were as Tempera- ture Outlet 137 136 138 138 146 140 140 129 135 137 124 133 137 134 134 134 134 136 D> 136 136 134 135 134 134 124 Average 1835 304*28 62-96 99*52 I35'48 After the six-hour run the engine was disassembled and the variou»«parts measured and examined. One exhaust 350 3)0 r ^ ex • / / / / 1 / A- i?00 MOO -400 iBOO ZW» ?PO0 i^OC MOfOB RfH f^g. f HP »a REVOLUTION CURVE X 50 fc-40 y y y' 3«0 «OC 700 600 900 lOOO itOO 1?00 iJOo 14M / 'A.'S 1006 <•«« '333 509 *«« «J3 2000 ^<M f)3J .RPM MOTOR 9 R PM WV^TER PUMP I WATfR PuMP Dl5CrtARGE Fig. 1.—The h.p.-r.p.m. curve of the 300 h.p. Knox aero engine. Fig. 2.—Curve of water pump discharge. Fig. 3.—Performance curves of the 6- and 1-hour tests. O-310 .. 1305 , xd £S£i«so 4. 5C " 80 7r777Z I 1 ^—1 •Y///V/. \ J 1 £•*•< i ' 'i a *i 3 a? 1 -a^ 5 sj « ' o 1 RUN 582
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