Noise Signature 429 vs 135 vs 130
Have a friend who is looking at both 429 and 135 but am trying to find some info for him on the decibel readings of each.
Would any member here who what the decibel readings are for the 130, 135 and 429. Thanks for your help. |
Good morning
You can find this data via the EASA Type Certificate Data Sheet for Noise: Bell 429: https://www.easa.europa.eu/sites/def...6%20Issue2.pdf EC130: https://www.easa.europa.eu/sites/def...Issue%2009.pdf EC135: https://www.easa.europa.eu/sites/def...Issue%2010.pdf These are the EASA versions, the FAA equivalents can be found via FAA website. |
I've sent you a pm...
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Mostly irrelevant but for some reason I can identify each type by ear almost 100% of the time 😜
Can't really say one is significantly louder but each have a fairly distinct sound. |
Interesting. Barely a dB difference between them. Form follows function follows regulation, I guess. Don't forget it takes a 10dB difference in SPL to sound twice (or half) as loud to human ears.
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Originally Posted by atakacs
(Post 11066829)
Mostly irrelevant but for some reason I can identify each type by ear almost 100% of the time 😜
Can't really say one is significantly louder but each have a fairly distinct sound. |
Thanks for the help everyone - have passed on info to he who needs it.
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Measurable differences is sound pressure levels while flying overhead aside, the H130 has by far the least obtrusive sound signature of the three.
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Originally Posted by Hot and Hi
(Post 11067112)
Measurable differences is sound pressure levels while flying overhead aside, the H130 has by far the least obtrusive sound signature of the three.
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Originally Posted by Windmill Wiz
(Post 11066762)
Good morning
You can find this data via the EASA Type Certificate Data Sheet for Noise: Bell 429: https://www.easa.europa.eu/sites/def...6%20Issue2.pdf EC130: https://www.easa.europa.eu/sites/def...Issue%2009.pdf EC135: https://www.easa.europa.eu/sites/def...Issue%2010.pdf These are the EASA versions, the FAA equivalents can be found via FAA website. |
Very true. How noise is perceived or how intrusive it is, has an element of subjectivity.
These figures are the certification noise data, warts and all: they are measured under set conditions, per prescribed procedures and verified by the certification authority; however, like performance data, real life can be different. For a real comparison, you would need to fly all three helicopters, on the same day, using the same profile. Better data on noise signatures does exist, but not in the public domain. |
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