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Aviation History
1919
1919 - 1508.PDF
NOVEMBER 20, 1910 , BUREAU Of STANOAROa . AERONAUTIC POWER PLANTS. REPORT Nc.24 HF±- m '^^M"*01'pkotlKL• ;^K"Jnst r " ' I .-OBr-ii!oL ISMyMO-.^I^Jti'i flteni,-:.! .:;:. •np-u-!T H frwa pit! -iijtja[lit ai-jterr- Btroaialfcie "noae. ' -jW^ '. ft'.-> mm BUREAU Or JIANOARO& AEROtHAUtlC POWER PLONTV fgEPORT BO,Z4. >"..*.,. Kre» Air Sp«ed - al./hr. Plot 5 radiators specially selected for each of the positions in which they were placed. The results are qualitative only, but they are so striking as to indicate that the nose of the fuselage is not a desirable location for a radiator from the point of view of head resistance. A model fuselage, 60 ins. long, 10 ins. wide and 13 ins. high, was constructed with a removable stream-line nose, which, when removed, allowed an 8-in. square section of radiator core to be placed in the nose (See Figs. 1 and 2). Two holes on each side of the fuselage, each about i| by 6| ins., were cut about a foot back from the nose and fitted with adjustable sliding doors. By adjusting these vents the amount of air passing through the nose was varied. The model was mounted in a 54-in. wind-tunnel, and the head resistance measured under the following condi tions :— fr (1) Streamline nose on model. (No change in resistance was observed whether vents were open or closed.) (2) Streamline nose removed, but nose radiator covered with a sheet of paper so that there was no air-flow through the core. (3), (4) and (5) Nose radiator in place, with varying amounts of air - flow controlled by opening Seven or eight different air speeds were tried in each case, the maximum being about 70 miles per hour. The results of these runs are given in plot I, against free air speed. They show (1) that the streamline nose decreases the resistance of the fuselage by 50 per cent., and (2) that the total resistance of the fuselage increases rapidly when air is allowed to enter the Plot 6. „„, now of Alr . ib»./wo./«q,ft. front Plot 6 radiator, so that a compact type of core is desirable for this position. Plot 2 illustrates these conclusions more clearly, since there the resistance of the fuselage at 60 miles per hour free air speed is plotted against the mass flow of air through the radiator. There is also plotted the total resistance of the fuselage with a streamline nose together with a free air radiator of the same core construction and of such size as to have a cooling capacity equivalent to that of the nose radiator at Pig. 1 the vents. any given mass flow. Plots 3, 4, 5 and 6 give the same data for two other cores, 3 and 4 being for a core of very low head resistance, and 5 and 6 for a core of very high head resistance, which would be a very good type for a nose radiator and a very bad type for free air. These are types of core consider ably better for free air positions than those included in this test, while the core represented in plots 5 and 6 is probably one of the best for the nose position. X510
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