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Joe Nall 2016, Official Noise Policy?

Discussion in 'Joe Nall Week' started by Bartman, Jan 13, 2016.

  1. Bartman

    Bartman Defender of the Noob!

    I went looking but couldn't find it, is there an official policy somewhere regarding noise levels of fueled aircraft engines/props?

  2. Terryscustom

    Terryscustom 640cc Uber Pimp

    Don't rip your prop like a dumbass is pretty much it in a nutshell. Everyone will be reminded of that as always in the pilots meeting but there is always someone who needs the talk by the flight line boss.
  3. If I remember triple tree posted just after 2015 event that gas engines for 2016 Would require three bladed props and a cannizter or tune pipe to reduce the noise impact
  4. ChickenBalls

    ChickenBalls "Cool Guy"

    Those were suggestions to quiet them down a bit. They also said they would be testing planes for noise, but have since backed out on that also. Like Terry said don't rip the prop, you'll be fine.
    Xpress, thurmma and combat chicken like this.
  5. No. The requirement is to be 98dB or less.

    Here is what the statement says:

    Triple Tree will require...Canister mufflers, three blade props, “soft mounting” of engines, and less than full throttle passes...will be a requirement for Joe Nell 2016.

    You are required to be noise compliant for 2016. There is no uncertainty or "fuzzyness" about their statement. If you folks want to keep flying at the largest radio control event in the world then you need to step it up and adhere to their rules. You are a guest at the event, respect the rules and regulations set before you. This isn't a free for all party where you can do what you want to, the original location for Joe Nall got shut down because of all of the noise. Besides, you as an AMA member have agreed to adhere to the AMA noise requirements guideline:

    Sound Limit Guidelines:

    96db measured from 20’ distance over soft fi eld (sod)
    98db measured from 20’ distance over hard surface (pavement/ concrete)
    This is taken straight from the AMA's ACADEMY OF MODEL AERONAUTICS MEMBERSHIP MANUAL 2015. You can download a copy of the manual and read it for yourself here, on page 6:


    Turbine aircraft fall under the same regulations as well, they are not exempt. If we piston aircraft have to adhere to the rules, so do the turbine aircraft.

    You guys signed an agreement when you signed up for AMA, you are obligated and required to adhere to that rule at an event where neighbors and noise are of concern.
  6. These two items are from GiantScaleNews Fourm about the Noise issue
    I would just run a canister or tuned pipe and a three bladed prop , it cant hurt and probale would insure a good future for Joe Nall fun fly.:shake:

    Originally Posted by BarracudaHockey http://www.GiantScaleNews.com/forums/images/beta/buttons3/viewpost.gif
    Care to enlighten? This is the 2nd or 3rd time I've seen this statement but I'm aware of no such obligation.

    Edit: Not saying there isn't, just looking for the reference
    Here is a snippet from the top of page 4 of the membership manual:

    ...It may not exceed limitations of this code and is intended exclusively for sport, recreation, education and/or competition. All model flights must be conducted in accordance with this safety code and any additional rules specific to the flying site
    Now, they do say that the sound levels are recommendations that are highly encouraged, and AMA does allow leniency for a club to establish their own rules, however that doesn't change the fact that we need to be polite, courteous, and respectful of those that were there before us (especially at an event like Joe Nall where the event coordinators have politely asked to keep noise to a minimum). Nobody is making you run canisters, or special motor mounts, or even 3 bladed propellers- they are, however, asking you politely to keep the noise to a minimum and avoid ripping your propeller at WOT.

    Not a hard rule to follow.. You can make a plenty fast KE pass without obliterating the air molecules around the tips of your prop http://www.GiantScaleNews.com/forums/images/smilies/198.gif

    Keep in mind excessive and continuous noise levels above ~90dB can lead to hearing loss. I personally like to have my hearing in tact.
    http://www.GiantScaleNews.com/forums/images/beta/statusicon/icon-status-online.png http://www.GiantScaleNews.com/forums/images/beta/buttons3/icon-pm.png http://www.GiantScaleNews.com/forums/images/beta/buttons3/icon-search.png
    Recent AMA articles have dealt with the issue of noise created by some of our models. Noise is certainly in the top two or three issues faced by many clubs around the world. If we, as modelers, wait for our neighbors to complain, you can rest assured the issue is significant.
    To prevent ANY possible problems with our current and future neighbors, Triple Tree will require, beginning with Joe Nall 2016 to be “neighbor friendly”. Canister mufflers, three blade props, “soft mounting” of engines, and less than full throttle passes can all be utilized to make our models more environmentally friendly and will be a requirement for Joe Nell 2016.
    Mr. Pat has donated this incredible facility to all of us modelers. We, as a group, have the responsibility to ensure it will be here for many generations to come. We cannot allow noise to be the demon that kills the golden goose. Plan ahead now to get any “prop ripping” models quieted down for Joe Nall 2016. We will have noise monitoring equipment on-site and will, for the first time, be monitoring sound levels. Gross offenders will be asked to terminate flight of any model exceeding AMA suggested noise guidelines. We must proactively reduce our noise footprint to ensure the long-term survival of “The Home of Fun, Fellowship and Hospitality”.
    Thanks in advance for your help with this important issue.
    http://www.GiantScaleNews.com/forums/images/beta/statusicon/icon-status-offline.png http://www.GiantScaleNews.com/forums/images/beta/buttons3/icon-pm.png http://www.GiantScaleNews.com/forums/images/beta/buttons3/icon-search.png
  8. Understanding the fact that what is a pretty sound to us as modelers isn’t necessarily a pretty sound to our neighbors is a reality that we all must come to grips with and deal with. The largest contributor to the loss of flying sites by a wide margin is the noise we produce. Sooner than later someone is going to build their dream country home within earshot of your flying field and if you don’t have noise under a certain amount of control you will quickly become a target.

    This document should help you to not only be reactive to a
    noise complaint but also you should use these guidelines to become proactive in getting sound under control before problems arise. After the authorities are alerted to a noise problem is not really the best time to start getting a handle on it. The best time is long before there’s an issue and if it’s done sincerely and adequately there may never be a problem. Keep in mind also there is a difference between what is a recommendation and what is legal for a particular piece of property and we’ll discuss this difference later in the document.

    What is “dB”?

    It is the acronym for decibels which is a measurement of sound wave impact, it is also a measurement that increases exponentially on the scale. In layman terms as the number increases the impact increases by several times over. To bring it down farther, 45dB is just above a whisper, 96 to 98dB is tolerable, at 107dB and up it starts to do real damage to your hearing.

    The easiest way to measure sound/noise is with a decibel meter. They are now relatively inexpensive and are mostly battery operated so using them at remote locations is easy. The one most often used is a small hand held model sold at the nearest Radio Shack for less than $50 so all clubs should have at least one. They can also be mounted on a camera tri-pod which will make testing and consistency simple.

    Sound Limit Guidelines:

    96db measured from 20’ distance over soft field (sod)
    98db measured from 20’ distance over hard surface (pavement/

    are normally tolerable to most people in the vicinity, pit area and spectators. These recommendations should also be very adequate for controlling the sound level outside your overfly area while in the air.

    What Is Actually Legal?

    Unless you live in the middle of no man’s land, all property will fall under the jurisdiction of a set of ordinances of some type. Whether it is State, County, township, etc. there will be a set of rules for what can and can’t be done with or on a particular piece of property. In these ordinances there are rules for fence lines, building set-backs, types of building and so on. There will also be a rule for how much noise (dB) that’s allowed to cross the property line. It may be hard to find but if you look deep enough or ask the right person you’ll find it, and normally that number will be somewhere between 50 and 65dB that’s allowed to cross a property line. Once you find the info on your property checking to see if you’re legal is easy by setting your dB meters at different places on the property line and take the readings. Keep in mind that other factors can add to the dB readings you get.
    If your field is located close to a major highway or busy road, the tire noise and other road noise can make a big difference.

    This all may sound a bit trivial but knowing where your flying site stands legally with regards to noise can and will give you a leg up
    if and when the need arises. Think of how handy it would be if you were to be confronted with a complaint, to know and be able to state that your flying site is within the noise ordinance limits.

    Ways of Abating Noise Problems
    1. Try a three-blade prop.
    The most important thing to remember about airplane noise is

    most of what you hear does not come from the engine, it comes
    from the prop. What you hear when your engine unloads in the air
    is the prop tips going supersonic, so getting the engine rpm down will limit much of that. So you think bigger two blade prop will slow the engine down right? wrong! Yes it will slow the engine down but now you have longer blades and the tips are actually going faster (physics). The answer is to ADD blades so you keep the diameter down while also reducing the rpm. The reason you see most of the big IMACC guys now using three blade props is not for performance, but noise control. If you don’t know how to figure for a three blade prop, you might ask your engine manufacturer for a recommendation or a rule of thumb is to reduce diameter by 1 inch or pitch by 1 or both if needed.

    2. Use as large as possible “canister-type” muffler.

    Just about all engines, glow and gas sold in the US market today are supplied with a large can type muffler. Most of these supplied mufflers will do a very adequate job of controlling the combustion noise coming from the cylinder. Also adding a piece of rubber hose to the outlet piped can also help in stopping some of the ringing sound that can be produced by the muffler. The rubber hose doesn’t have to extend past the pipe, just cover it like insulation.

    3. Soft mount your engine.

    Often there can be quite a bit of noise coming from your airframe especially if it contains a lot of fiberglass or is open structure covered in plastic film. When the engine is hard mounted to the firewall the vibration will be carried back through the airframe and essentially act as a drum unless there is some type of absorption material in there
    to soak it up. Many of the newer 30% and 40% aerobatic aircraft have foam turtle decks and other foam parts that absorb much of the vibration noise, if not your beautiful machine will sound more like a drum kit than a purring kitten. There are several soft mount systems on the market today. BTW, to my knowledge, all full-scale piston engines are soft mounted. Take a lesson from the big boys.

    [​IMG] [​IMG]
    96 dB at 20 Feet - Soft Surface 98 dB at 20 Feet - Hard Surface

    Sound Meter to Aircraft 20 feet Distance


    The dB meter should be held approximately two feet above the surface in the direction of the aircraft and take a few readings

    at different angles to the aircraft (front, back, side, etc) and take an average. This method should

    [​IMG] [​IMG] [​IMG]
    Distance for Sound Measurement Sound Meter

    [​IMG] [​IMG] [​IMG]
    do an adequate job
    of measuring the real sound level being put out by a particular aircraft/engine/muffler combination.

    These recommendations are not quiet by any stretch but

    24 inches

    [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG]
    Sound Meter Setup
    Bartman likes this.
  9. Bartman

    Bartman Defender of the Noob!

    Thank you for posting that Rusty! It's confusing though, are all of those things literally "required" or are they suggestions to get to the "required" outcome of a quieter aircraft?
  10. Terryscustom

    Terryscustom 640cc Uber Pimp

    Sorry @Rusty 73 , you seem pretty passionate about it but it those items were indeed suggestions of ways to reduce your db levels. It's been confirmed by people in the know outside of forums and all the sideline jockeys. Just show up, play nice, don't rip your prop and those types of things won't be a requirement in the future.
    Xpress, thurmma, Bartman and 2 others like this.

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