Noise Levels - A Reference List - Printable Version
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Noise Levels - A Reference List - smuzz - 03-09-2012
SteveB and I coincidentally bought some dBA meters several months ago with the aim of doing some testing at the field. Finally got around to starting this on the weekend. The idea is that we might build up a list of known planes and their noise levels which can give us an idea of the racket we might be making.
All tests are done at a distance of 7.5m in an arc from the front of the plane to the back, with the highest level recorded.
Here are the results (all measurements in dBA) ...
Ambient measurement: 50
| Dynam Meteor (on 4S with unbalanced EDF): | 78 |
| Parkzone F27Q Stryker (stock configuration): | 77 |
| Parkzone Stryker (Modified): | 76 |
| Parkzone T-28 Trojan (stock configuration): | 68 |
UPDATE: I've added a chart which came with the dB(A) meter I bought. It lists a collection of common sounds and their expected noise level - not really a calibrated reference, but it helps get an idea of the logarithmic dB scale.
RE: Noise Levels - A Reference List - brotherblonde - 03-09-2012
That's a great idea Steve/s. Out of interest, of the 3 planes you tested, where was the noise the greatest? eg; front, abeam motor, 45' off..etc.
I'd like to test the Spitty's sound system at that distance...it's about 95db at 1m.
RE: Noise Levels - A Reference List - kizza42 - 03-09-2012
I've measured my old Dynam Meteor on 4s (Habu clone) with an unbalanced fan using the same testing criteria.
It ran 78dBA
RE: Noise Levels - A Reference List - Raptorfly - 03-09-2012
(03-09-2012, 05:22 PM)kizza42 Wrote: I've measured my old Dynam Meteor on 4s (Habu clone) with an unbalanced fan using the same testing criteria.
It ran 78dBA
What is the limit?
RE: Noise Levels - A Reference List - smuzz - 03-09-2012
(03-09-2012, 05:22 PM)brotherblonde Wrote: ... Out of interest, of the 3 planes you tested, where was the noise the greatest? eg; front, abeam motor, 45' off..etc.Haven't really tested enough to be sure yet Andrew, but I guess it will depend a little on the airframe - the Stryker has its fins partly occluding the propeller from the beam. We can test your Spitfire next time you've got it at the field, no worries.
I'd like to test the Spitty's sound system at that distance...it's about 95db at 1m.
(03-09-2012, 05:22 PM)kizza42 Wrote: I've measured my old Dynam Meteor on 4s (Habu clone) with an unbalanced fan using the same testing criteria.Thank you Kizza - I'll add that one to the list.
It ran 78dBA
(03-09-2012, 05:37 PM)Raptorfly Wrote: What is the limit?We think that 80 dBA should be the limit as that's what's specified in the NSW Government Protection of the Environment Operations (Noise Control) Regulations of 2008 and is the limit for lawn mowers and whipper-snippers.
RE: Noise Levels - A Reference List - robair - 03-09-2012
G'day All
It may not be applicable to assign a straight db maximum?
Different aircraft make different frequencies of sound, the psychoacoustal brigade will argue that a large 3d aircraft gnashing its prop at 70db is going to be a lot less offensive then a low blade high speed edf at the same db to the ears of our field neighbours.
Cheers
Rob B
RE: Noise Levels - A Reference List - secant0give - 03-09-2012
(03-09-2012, 08:50 PM)robair Wrote: G'day All
It may not be applicable to assign a straight db maximum?
Different aircraft make different frequencies of sound, the psychoacoustal brigade will argue that a large 3d aircraft gnashing its prop at 70db is going to be a lot less offensive then a low blade high speed edf at the same db to the ears of our field neighbours.
Cheers
Rob B
This is true also high frequency sound energy is attenuated more easily than that of lower frequency.
RE: Noise Levels - A Reference List - brotherblonde - 03-09-2012
So my V12 Merlin should be ok then.
RE: Noise Levels - A Reference List - gbanger - 04-09-2012
High or low frequency? Thats a tough one but we have to draw a line in the sand somewhere and 80 dBA is the agreed value as it complies with noise regulations.
So at the end of the day it really doesn't matter what we think about the difference in frequency of the sound, If its over, its over, simple as that!
And Yes Andrew. I think your Merlin will be sweet.
