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Old 06-26-2005, 10:44 AM   #1
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Radio shack Sound meter

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Can someone tell me how to setup the Radio Shack analog DB meter for taking noise measurements.

Mike Sebastien
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Old 06-26-2005, 10:58 AM   #2
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we use "A" setting and slow response.

Our tests are done from 7.5 meters. The center of the prop arc is located over a fixed marker on the ground, the model is staked there, and the sound meter is on a tripod, also in a fixed location. Everyones planes and helis are measured in the same place, eliminating any variables with terrain, tables, etc....

The sooner you fall behind, the more time you will have to catch up.
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Old 06-26-2005, 12:24 PM   #3
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sound readings

It's not always the same area that is noisy on a plane.

The readings should be taken from all sides of the plane.

It will also vary with the type of surface you are on.

There are a whole bunch of other variables but one to check is the amount of nitro used in the fuel. It can make a fair difference as added nitro increases the noise level of both the exhaust and the prop.

We could go on about this forever.

The real bottom line with noise measurements is whether or not the members have a desire to reduce noise or they are willing to cheat to get under the limit when being tested.

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Old 06-26-2005, 01:38 PM   #4
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When I test engines, and take a sound level I take readings at the 4 places (off the each side and front & back) with the engine at full throttle with the flying prop. I am holding the meter at approx 4 feet off the ground, and the model is usually on the ground (some planes like my AC-1) are not able to be held up.

Sometimes I am on grass, sometimes I am on hardpack earth. Makes a lot of difference, as does the model itself (sometimes you get a loud resonant noise off the model).

There will be variance as you go from field to field, even if you are near your clubhouse you will get a different reading than of you are out in the clear. I guess the sound bounces off and the meter reads louder.
Andrew Coholic -MAAC #26287L

1/2A to giant scale, IMAC, SAM, R/C sport, turbine jets, Heli's...
if its got a wing or two and an engine - I like it!
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