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' About Helicopter Noise 53 <br /> , Figure 16 also provides some basis for comparing helicopter noise to other familiar <br /> noises. � <br /> . � <br /> �.. 115 — . <br /> . `c�# <br /> , <br /> chain — — 1�� <br /> �::; <br /> ;i?'.'r <br /> saw `�'� <br /> �c� � — <br /> . 103 102 <br /> , — — 100 <br /> diesel train <br /> � (50 ft) , 95 — <br /> , — 90 helicopter <br /> 88 � ri gp ;,,� gp — <br /> '!�?; ;� (500 ft) <br /> �' -.��� — � heavy <br /> ��� =��st. �,. 82 <br /> y`i <br /> power ' SO 7g '� 80 <br /> 77 <br /> lawnmower truck or f — inte�mediate <br /> bus � ' ' 73 <br /> (50 ft) 70 <br /> ���68 <br /> � — \\ light <br /> , <br /> 60 — — <br /> automobile dg�q� 60 � <br /> (50 ft) , <br /> Figure 16. Comparisoii of Soir�ids <br /> � <br />