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Model Flying NZ Noise calculator
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Please note that this is an advisory document only.
Acceptable noise levels will be set by each club as they are required to respond to local noise bylaws for each location. 		Version 1.9
BTL 4 Feb 2010
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Distance Converter
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MetricImperial
To add two noises
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This levelatmetresatfeet
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887DiffAdd
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equals
or equals
03
8
934987-32
9
915978-61
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896969-100
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8879510
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8789411
To calculate a limit for your field
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8699412
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85109313
Enter the distance to the "noise-sensitive property"
650
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651008725
Enter the councils noise limit, usually 50dBA
50
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59200
Do they apply the 5dB penalty for models? Insert 5 if so
5
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55300
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Please read the following Notes
This is the maximum noise you should make at 7 metres
84
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ONLY change the variables highlighted in green
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Results appear in gray
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All figures have been rounded-off to the nearest dB.
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Two noise sources the same amplitude will appear to be 3 dB louder than one.
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The human ear equates a 9-10 dB reduction to be about "half" the volume.
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Doubling the distance reduces the noise by 6 dB
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Halving the distance increases the noise by 6dB
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Most humans cannot easily detect a 1-2 dB difference
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Most humans do notice a 3 dB difference
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Most humans perceive a 10dB difference as twice as loud.
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There are many sources of error when measuring noise, DO not "ban" a model if it's within 2-3 dB of the limit.
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Contact the MFNZ Council for more advice or information.
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International Noise limits (Normalised to 7 metres)
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SPL dB(A)
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100
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99
IMAC (Tarmac)
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98
38
97
IMAC (grass)
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96
40
95
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94FAI (F3M)
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93
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92
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91
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90
AMA (98 at 9 rule)
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89
NZMAA, MAAA, MAAC, MACI
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88
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87
49
86
50
85
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84FAI (F3A)
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83
53
82
BMFA AMA (90 at 9 rule)
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81
55
80
56
79
NZMAA (Proposed by Poletti, 1992)
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78
58
77
59
76
60
75
61
74
62
73
63
72
64
71
65
70
LTNZ new proposed rules for vehicles (for comparison)
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67
68
69
70
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72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100