Experiments in External Noise Reduction of ... - CAFE Foundation

More documents

Recommendations

Info

NACATN 2079 101AverageAverageEngine: frequency Propeller: frequencyFundamental –––—–—— 9’7 Fundamental —-— — 65Second, harmonic — — —195 Second harmonic —-- —130Third harmonic —--- —Over -all level$O.,$00Nosel-’ 0 0o0‘o../? ,.\\ Lu$80°LeftwingRightwing& .-db1000//’/.zJoo.Sound level in db referred to 0.0002 dyne/cm2(a) StandardStinson,configuration1. SensenichSkyblade.Figure 27.- l?requencyanalysison ground 50 feetfrom hub. Sti configurations.Refer to tableIIforenginepower, tipspeed,and propellerdiameter.——.. —._... ._. __-— _
102NACATN 2079AverageAverageEngine: frequency Propeller: frequencyFundamental -––——–130 Fundamental —– — -— MSecond harmonic — —Second harmonic —--—103‘Third harmonic —---—163Over-all levelNose.->LeftwingightingSound level in db referred to 0.0002 dyne/cm2(b)Two-bladed propeller,configuration2A.Figure 27.- Continued..—— —.
Page 5 and 6:
4 NACA TN 2079DESCRIIZIItONOF APPAR
Page 7:
6 NACA TN 2079Propellers and Pr@el.
Page 10 and 11:
NACA TN 2079 9oTo determine the air
Page 12 and 13:
.NACA TN 2079 11was used to measure
Page 14 and 15:
NACA TN 2079 13con~unction with exh
Page 17 and 18:
16 NACA TN 2079configurations and a
Page 19 and 20:
18 NACA TN 2079observed in the rech
Page 21 and 22:
20NACA TN 2079however, the differen
Page 23 and 24:
22NACA TN 2079a direct-drive airpla
Page 25 and 26:
. .—-. ._. — .----- . .‘..24
Page 27 and 28:
.26rNACA TN 2079 “APPENDlxGROUND
Page 29 and 30:
.. .. _ .28 NACA TN 2079Dur@ thiS t
Page 31 and 32:
.- —.-_ ._ . . .. . .. .. .30 NAC
Page 33 and 34:
.=___. . . _.NACA TN 2079“v.—
Page 35 and 36:
3k ‘NACA TN 207’9TABLE v. - SOU
Page 37 and 38:
36 NACA TN -207’9. —.cclm mu mm
Page 39 and 40:
.w...*..— — -
Page 41 and 42:
40 NACA TN 2079f——.,,1%j3 0.ọ
Page 43 and 44:
*.I——.._ .——.—
Page 45 and 46:
.1........——
Page 47 and 48:
-- ......—. —
Page 49 and 50:
...
Page 51 and 52: .....— - .—.
Page 53 and 54: :,.__ —- -———.
Page 55 and 56: . 54NACATN 207’940.1635.1420.1225
Page 57 and 58: ...56I?ACATN 2079/40.16-40,35.14 -3
Page 59 and 60: 58 NACATN 207940.16!035.143530.1230
Page 61 and 62: ...‘,...
Page 63 and 64: ....-—— . __ -—.
Page 65 and 66: ..,I..
Page 67 and 68: “....——-.
Page 69 and 70: d,’ -..-....T.-..-—
Page 71 and 72: .70 ‘\I .zw(
Page 73 and 74: 72 NACA TN 20794ml..—.— -.
Page 75 and 76: . ... .74 NACATN 2079-1-$wii(xl..
Page 77 and 78: 76 NACATN 207’$)..nml.1b-._ .—
Page 79 and 80: 78 NACA TN 20’79..—.— — —
Page 81 and 82: .80 IVACATN 207’9—..—— -.--
Page 83 and 84: 82 NACATN 207’9——— —--—
Page 85 and 86: 84,-“
Page 87 and 88: 86 NACATN 2079..-— ..— — —
Page 89 and 90: ..88o0d+NACA TN 2079.o0*ml.o.0*IN8m
Page 91 and 92: 90 NACATN 2079.,..—— — - —
Page 93 and 94: $)2 NACATN 2079Im“Na)zis,.——
Page 95 and 96: 94 NACA TN 2079.(1.Im“ml..u“b..
Page 97 and 98: 96 NACATN 2079CD-d+o ‘+1..,,—
Page 99 and 100: . .98 NACATN 2079../0alCnIm“mlalE
Page 101: 100 I?ACATN 2079(5ml.r!-—. ——
Page 105 and 106: 104 NACATN 2079AverageAverageEngine
Page 107 and 108: 106 NACA TN 2079.AverageAverageEngi
Page 109 and 110: 108 NACATN 2079.5 m.0---- .——
Page 111 and 112: 110 - NACATN 2079.!5CL),,./,“,. .
Page 113 and 114: .—. ..——-— -——— --- .
Page 115 and 116: —.. —.- .— ——L ———-
Page 117 and 118: .— . ..—.. .. . . . . . .. . -.
Page 119 and 120: _. . —A—._. -—o 0ml118●●
Page 122: NACA TN 20791210=.,.,NACA-Langley -
show all

Experiments in External Noise Reduction of ... - CAFE Foundation

Create successful ePaper yourself

Delete template?

Save as template?