Abel, I may be wrong on this but the "A" part you talk about, would that be the same thing as comparing a high pitched two stroke engine to a four stroke, plane, dirtbike, whatever? I guess is the "A" part supposed to be a way to compensate for a lets say a louder 4 cycle to become the equal of a quieter 2 stroke becuase the human ear finds the noise less offensive? Just asking. If I take the rest of your post right you are basically saying that you really cant control the noise because we have props making a lot of it no matter how they are driven. That might be true as I heard a 3w 4 cylinder turning a prop to where it made WAY more noise than any other plane I have ever heard. I thought it was great.lol. Myself I think the pop pop pop sound that comes from regular exaust systems on gas planes could easily be taken care of, sometimes they will have a "tinny" sound, almost like the muffler was loose. I think that kind of sound is more noticeable than most prop noise myself. Also on glow engines just an extension of silicone tubing changes the tone of the engine noise greatly and I would imagine also quiets things as in the quad racing world guys have been known to fail a db test, go zip tie a piece of dirtbike innertube onto the outlet flange and then go pass the db test. In that instance there is an actuall reading that is less db's regardless of how humans percieve the noise. Myself I am not worried about the noise my model makes to much yet although one time I did run some silicone tubes on my first 33% after a complaint but others had said that guy complained any time someone flew a large model, I was fairly new to the rc planes and the club at that time so I tried to make a little peace. I just wonder if noise is such an issue, couldnt someone in high places make it mandatory to do what could easily be done to keep things quieter. If IMAC for instance didnt let a single plane fly that wasn't equiped with canisters I would think all GS manufacturers would make their planes canister ready without modification. That would mean that All GS planes could be quieter if they were proped right and did indeed run cans instead of mufflers. Then the local level could actually push people to try and run quieter setups a little easier maybe. Just dont have IMAC say that its happening, let everyone know its going to happen at a set time and give everyone a chance to design their latest models to conform. Noise levels are so funny how people justify what they run but complain about others. I have heard some guys comment about the noise my GS planes make while others run unmuffled glow engines that seem twice as loud. Weather or not they are twice as loud or not I dont know but I would have to think way more irritating to no rc'ers since many rc'ers find them more irritating. Personally I think there are other factors more important than noise although that might be an easy complaint to make to the authorities. I think size is a huge factor, I think being part of the community probably helps also. I never did get the thinking behind having a flying site on public property and then putting a limit on membership. I dont think that the school demonstrations may be the best idea as I can see those kids that are interested going home and nagging their parents to death lol. Its probably not that bad though. I think open to the public days, sell some food, just try to cover your cost, not make a bunch of money on it, flight demos by some of the good pilots, buddy cord for whoever wants, put an add in the paper, a big one so people will see it. Do what you can to entertain people, see if the paper will do a story or print a story for you. Have a good pic from the day. If a reporter happens to come out to the field just on a whim to take a pic and write something up, make sure the pic is of someone in the home town!!! Not one of the members from another city that probably noone in the hometown will know. Thats happened at my club a few times and it kind of amazes me that every time the pic and caption winds up letting everyone know that hey great, someone from the big city is out using our small town recources. It would HAVE to be petter PR to have a hometown person pictured. I dont even know why the paper guy does that? I have been to a flyin where its a fourth of july party also, there are other things to do besides just fly or watch flying. rc cars, rc tractor pulls, fireworks, fun for pretty much anybody that breaths. Even if your club doesnt have a car track people could be entertained by a break with a quick rc car race, somebody in the club is probably into that also. If its a grass runway you can lay out some plywood for jumps, if pavemanet the same thing or some garnden hose laid out quick for a nice oval race. If your having a contest, get the news to come out if you can. Thats big publicity for the club to make money on if its a 2 day thing and you charge for parking or something like that and get yourself percieved as an attraction not a problem to get rid of some day.