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Originally Posted by kevinh
My exhaust was a pre muffler Vetterman. If I was building now, I'd definitely go with the muffler.
With airports being closed across the country, it is important to try and be a good neighbor.
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Cessnas have "mufflers" and they are noisy as ****. The down side of Cessnas are they are slow and people on the ground hear them a lot longer. RV's move so fast the source goes by faster and the perceived noise is less. I know. I sit under a path with cessnas and RV's cruising by at low altitude. The cessna drone goes on and on. The RV just goes so fast you hear "pu put puT PUT Put put ut.....", than a spec on the horizon and no sound. It does not last long.
(please no low level acro over the elementary, muffler or not,
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I can not argue with kevin, I like the way he thinks, be noise conscience. However I would say the RV's really climb very well and get above the ground fast, plus you can choose the way, where and when you fly over people, places and things. Some people will complaining if a glider flys over.
With that said I would skip the Muffs if the weight is high and the noise suppression is not significant.
I can't imagine they are super silencers by their size. A muffler's ability to suppress noise is usually proportional to it's size, weight and loss of engine performance (back pressure). Like I said have you heard any airplane that was really quite with a muffler? (cessna, piper, beech...)
I have no intimate knowledge of Vetterman's product, but if there are greater cost, weight and heat under the cowl than straight pipes, I would pass.
However thinking positive, if it really lowers the old Dee-Bees (noise), it would be worth it. You got to research it. Vetterman should do a controlled test with a dB meter, with and without muffler. If it does not make a big difference you are carrying dead weight around. Also they are bigger units that take room up under the cowl and may add more heat under the cowl since mufflers tend to get hot and it has more surface area than straight pipes.
Here is a HOT TIP (pun intended)
Piccolo tip -OR-
Piccolo bent tip They don't cost, weigh much or add much heat under the cowl. No it will not be stealth but does make a slight but noticeable level change (3 dB)** and tone, I have been told.
** claimed, but no comment how it was measured, take off power etc.
I have thought of a
swiss muffler, but the external drag would cost some speed. In Switzerland they have strict noise control and homebuilts use long external "glass pak" pipes, but they do work, and could make one. Even though it's visable and undoubtedly cost some speed it's effective as I understand it.
Here is an excellent article which address everything I touched on:
http://www.piteraq.dk/flight/muffler.html
http://www.piteraq.dk/flight/exhaust.html
Cheers
Mufflers or not
Linear Mode
