Giants From Down Under

[notorious_benny]

	Quote: Originally Posted by RH1N0
	Benny, I'm mainly interested in recording the levels that the judges are hearing to see if I can quantify the noise differences that we are being asked to consider when assigning a noise score. Since the meter is placed in a similar location to the judges, height/distance effects should be the same on the graph as what is perceived by the judges. Sound levels at other locations around the field are outside the scope of this testing. Wind could be interesting and I was glad to have had a day with less than 5 kt breeze. The foam wind-screen on the meter seemed to do a good job and the ambient reading was much the same throughout the day. I was watching the meter to see if any of the readings were affected by wind or other sounds from the field such as the caller or the pilots giggle (Richo). I'm keen to do some more testing on a windy day to see how the results are affected. An interesting fact: On one sample, 50 seconds of prop and engine noise were exceeded by the aileron squeal of a compy doing a throttle off snap on base height, center box.

My point is that as a judge I take into account the distance the model is flown. The model may not make your ears bleed because it is so far out but if you can hear the prop rip bouncing off the hill behind you etc you will still quite likely hand out a TN score.

[feral63]

benny you also need to take into account the size of your head is not proportional to anything smaller than a 3m airframe. therefore the X reading on the scale would significently change your percieved sound levels.

	Quote: Originally Posted by notorious_benny
	My point is that as a judge I take into account the distance the model is flown. The model may not make your ears bleed because it is so far out but if you can hear the prop rip bouncing off the hill behind you etc you will still quite likely hand out a TN score.

[Cookie]

Hi Chaps, I have sent an e-mail informing those who entered the Monarto IMAC event that it has been postponed due to forecast gale force winds and rain for this weekend, I must have used up my quota of good weather with the Naracoorte, Barossa and Constellation comps.

I am looking at rescheduling for either the 26th & 27th of July or the 9th & 10th of August depending on interest.

If not it will be later in the year, anyone want to buy some trophies, my visa is getting very low...

[TROYS PIT-BITCH]

I think uncle troy better start teaching noah now, he should be ready by five

[RH1N0]

	Quote: Originally Posted by morerevsm3
	10db is not twice as loud as 5dB, as it is a sliding scale similar to richter scale, adding 3dB is considered to double the perceived sound anywhere in the range of human perception

I'm using the following as a guide. I could be wrong:

How do we quantify sound?
Because of the wide range of sound pressures encountered, a special scale, the decibel scale, has been developed. The sound level increases by 3 dB (or decibels) when the actual sound energy present is doubled. Conversely, half the sound energy must be eliminated to reduce the level 3 dB. A six decibel change indicates four times as much sound, and a 10 decibel change 10 times the sound. However, the ear does not perceive these changes to be so large. Most people find a 3 dB change barely noticeable. A 6 dB change is clearly noticeable, and a 10 dB change is perceived as a doubling or halving of loudness. This is very important. It means that 90% of a given sound energy must be eliminated before most people will judge a sound half as loud.
People do not hear very low-frequency and high-frequency sounds as well as they hear sounds in the middle speech frequencies. A special electronic filter is used in sound meters to simulate this characteristic of the ear. For many environmental sounds it gives a simple, single-number descriptive level that correlates with the way people judge the loudness of the sound. This measure is called the A-weighted sound level. The units are usually written dBA or dB(A).

[boxhead41]

	Quote: Originally Posted by notorious_benny
	Check this kid out! I might as well retire from model plane flying right now! http://www.flyinggiants.com/gallery/...hp?photo=46992

hey benny go to www.justinchi.com you ought to see this kid fly a helicopter he went solo on planes at age two.

[stik-slam-R]

Hi all
what an awesome weekend at hunter valley imac my first imac comp. Thanks to all for coming along.

Also became a dad on monday morning to a baby girl Mia Jayde 7 pound 12.5 onz mum and bub doing sweet. This means old man Gavo is a grandad now so he realy is an old man

here are some pics

[stormin23]

Chris,
Congratulations on the baby mate and welcome to the club. Child birth certainly is a humbling experience,I know Ive been through it few times and on all occasions I have felt somewhat inadequate in more ways than one, now the real fun begins.

And just a quick not to all the Maitland crew for putting such a great event, the IMAC bug has certainly bit me on the bum and just checking my diary to see which ones we can go to next. I have a stack photos and will post some when I can work out how to do it.

Thanks again and hope to catch up with you all again

Norm

[RustyTumbles]

	Quote: Originally Posted by feral63
	benny you also need to take into account the size of your head is not proportional to anything smaller than a 3m airframe. therefore the X reading on the scale would significently change your percieved sound levels.

[RustyTumbles]

Jeremy,

Just curious what the average was in dB?

[notorious_benny]

	Quote: Originally Posted by stik-slam-R
	Hi all what an awesome weekend at hunter valley imac my first imac comp. Thanks to all for coming along. Also became a dad on monday morning to a baby girl Mia Jayde 7 pound 12.5 onz mum and bub doing sweet. This means old man Gavo is a grandad now so he realy is an old man here are some pics

Congratulations to you and your wife Chris

Grandpa Gav! How bout that................

[RH1N0]

	Quote: Originally Posted by RustyTumbles
	Jeremy, Just curious what the average was in dB?

Average was 61.1 dB

Ambient was 42 dB

Remember that it is the average of a series of peak values of 1 minute samples. Not the average sound produced by a flying plane.

Ambient is roughly what the meter settled to when no one was flying at the time.