sprout5199
Posts: 1681
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GA Exhaust System

Fri Feb 08, 2008 7:56 pm

Was outside having a smoke(I work near PBI) and a thought occurred to me:

How come there is no noise suppression on GA aircraft exhausts? I know it reduces HP, and add a little weight, but seems to me the benefits would out weight the minuses. A cirrus/cessna/piper on climb out is very loud.

Just a thought.

Dan in Jupiter
 
2H4
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RE: GA Exhaust System

Fri Feb 08, 2008 8:06 pm



Quoting Sprout5199 (Thread starter):
How come there is no noise suppression on GA aircraft exhausts? I know it reduces HP, and add a little weight, but seems to me the benefits would out weight the minuses. A cirrus/cessna/piper on climb out is very loud.

Well, I believe the vast majority of the noise is produced by the propeller, followed by airframe noise. The engine itself probably makes no more noise than a Subaru with a Pep-Boys exhaust system.

2H4
Intentionally Left Blank
 
sprout5199
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RE: GA Exhaust System

Fri Feb 08, 2008 8:17 pm



Quoting 2H4 (Reply 1):
I believe the vast majority of the noise is produced by the propeller,

DUH, should have thought of that.

Is friday---brain fried till 1st beer.  drunk 

Dan in Jupiter
 
N353SK
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RE: GA Exhaust System

Sat Feb 09, 2008 6:09 am

Newer Pipers actually do have a muffler and are pretty quiet on the ground or on approach.
 
lowrider
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RE: GA Exhaust System

Sat Feb 09, 2008 11:38 am

Quoting 2H4 (Reply 1):
Well, I believe the vast majority of the noise is produced by the propeller, followed by airframe noise.

Agreed. If you want a comparison, you can use two aircraft with the same (or similar) engines but vastly different props. A Cessna 206, for example, can have a 2 or 3 bladed prop, in terms of fly over noise, the 3 bladed one is quieter. If you want real prop noise, go find a Seabee, or a 207 with a 2 bladed prop. What a great way to piss off the neighbors.

[Edited 2008-02-09 03:40:30]
Proud OOTSK member
 
BoeingOnFinal
Posts: 440
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RE: GA Exhaust System

Sat Feb 09, 2008 12:48 pm

You want REAL noise, try the contra-rotating props the Russians are so fond of. I can hear them take off in Moscow right now, and I live in Southern Norway.

Any who, there are some muffler fit small aircraft out there. ( Click )
norwegianpilot.blogspot.com
 
N231YE
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RE: GA Exhaust System

Sat Feb 09, 2008 10:29 pm

The Cessna 172 has a muffler, in fact, the cabin heat comes from shrouding that surrounds the muffler.

Pipers have what may be smaller mufflers...I don't know. But at least they're loud...what a real airplane should be  mischievous  *cough* *cough* 2H4 *cough*
 
2H4
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RE: GA Exhaust System

Sun Feb 10, 2008 7:17 pm



Quoting N231YE (Reply 6):
Pipers have what may be smaller mufflers...I don't know. But at least they're loud...what a real airplane should b

Loud/cool Cessnas are easily found - particularly those with radial engines. Radials must have been deemed too hardcore for the nancies at Piper.  mischievous 

2H4
Intentionally Left Blank
 
N353SK
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RE: GA Exhaust System

Sun Feb 10, 2008 7:31 pm



Quoting BoeingOnFinal (Reply 5):
You want REAL noise, try the contra-rotating props the Russians are so fond of. I can hear them take off in Moscow right now, and I live in Southern Norway.

Mitsubishi MU-2 anybody?
 
atct
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RE: GA Exhaust System

Sun Feb 10, 2008 8:52 pm



Quoting 2H4 (Reply 7):
Radials must have been deemed too hardcore for the nancies at Piper.

Amen my brother. Only wish I could put a radial on my RV-8 project!!!

Clint
(Radials dont leak oil, theyre just marking their territory.)
Trikes are for kids!
 
KELPkid
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RE: GA Exhaust System

Sun Feb 10, 2008 11:17 pm



Quoting N353SK (Reply 8):
Mitsubishi MU-2 anybody?

Aah, the Hoover model  Wink Like I've said before, between the MU-2 and the 20-series Learjets, these are the reasons that lineboys must wear hearing protection .
Celebrating the birth of KELPkidJR on August 5, 2009 :-)
 
N231YE
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RE: GA Exhaust System

Mon Feb 11, 2008 12:03 am



Quoting 2H4 (Reply 7):
Radials must have been deemed too hardcore for the nancies at Piper.

From Encyclopædia Britannica Online:

Quote:
Cessna and Beechcraft still used radial-piston engines, but Piper relied on a horizontally opposed four-cylinder engine that allowed engineers to design a more streamlined engine nacelle. This type of engine became the preferred style for modern light-plane.

http://www.britannica.com/eb/article...0589/history-of-flight#943744.hook

I guess Piper was so advanced for their time, Cessna seems to have copied Piper after they realized who the leader was  biggrin 
 
2H4
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RE: GA Exhaust System

Mon Feb 11, 2008 12:17 am



Quoting N231YE (Reply 11):
who the leader was

Cessna:


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Piper:




.....and, the prosecution rests.  biggrin 

2H4


P.S. - In terms of recips, a radial is to a horizontally-opposed what Chuck Norris is to Barry Manilow.  yes 
Intentionally Left Blank
 
N231YE
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RE: GA Exhaust System

Mon Feb 11, 2008 12:48 am



Quoting 2H4 (Reply 12):

That's what happens when bad management runs a company for many years, kinda like the Apple Computer of the 1990s.

Its too bad when people think of a bush pilot, the aircraft that often comes to mind is:


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Yup, not a Cessna  wink 
 
2H4
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RE: GA Exhaust System

Mon Feb 11, 2008 1:07 am

Yep, I'll freely admit the Cub is extremely cool. The PA-48 also scored extremely high on the coolness scale.

That's where the coolness ended, though. The important thing is that the aviation community welcomes the poor, misguided single-engine low-wing Piper fans into the world of good taste.  Smile

2H4
Intentionally Left Blank
 
atct
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RE: GA Exhaust System

Mon Feb 11, 2008 1:55 am



Quoting N231YE (Reply 13):
Its too bad when people think of a bush pilot, the aircraft that often comes to mind is:

Besides the DHC-2, the best bushplane of all times. (Though they have different missions)
Trikes are for kids!
 
N231YE
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RE: GA Exhaust System

Mon Feb 11, 2008 4:57 pm



Quoting ATCT (Reply 15):
Besides the DHC-2, the best bushplane of all times.

That's a nice airplane, fortunately, its not a Cessna  mischievous 
 
sprout5199
Posts: 1681
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RE: GA Exhaust System

Mon Feb 11, 2008 6:11 pm

Damn, this went from a stupid friday question to a knockdown drag out between Cessna(2H4) and Pipers(N231YE) real quick. Not that I mind it though.

I vote for Cessna. Thats what I fly, if a 152 can be counted as an airplane. More like a large dragonfly with seats. But a dragonfly has more horsepower.

Dan in Jupiter
 
2H4
Posts: 7960
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RE: GA Exhaust System

Mon Feb 11, 2008 6:48 pm



Quoting Sprout5199 (Reply 17):
Damn, this went from a stupid friday question to a knockdown drag out between Cessna(2H4) and Pipers(N231YE) real quick. Not that I mind it though.

Just to be clear, my pro-Cessna position is based entirely on the sheer ugliness of Piper's counterparts. I'd still buy N231YE a beer any day of the week.  biggrin 

2H4
Intentionally Left Blank
 
KELPkid
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RE: GA Exhaust System

Mon Feb 11, 2008 7:04 pm



Quoting 2H4 (Reply 18):
Just to be clear, my pro-Cessna position is based entirely on the sheer ugliness of Piper's counterparts. I'd still buy N231YE a beer any day of the week.

2H4

As to the C vs. P wars, I just ask the person who is behind each manufacturer's product to do the following: Get established on final, and cut the power to idle. Which one still makes the runway, and which one drops like a rock?  eyebrow  HINT: the Hersheybar winged-one develops a really high sink rate  Wink
Celebrating the birth of KELPkidJR on August 5, 2009 :-)
 
atct
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RE: GA Exhaust System

Mon Feb 11, 2008 11:10 pm



Quoting KELPkid (Reply 19):
HINT: the Hersheybar winged-one develops a really high sink rate

So do Bonanza's but no one is saying theyre crap :P

Anywho I like Piper Archers, but at the same time I really like the straight tail 172/182's from 57-58ish, but as I get older...im rapidly becoming a Beech fan lol. (also as I start hanging out in wealthier circles lol...I cant afford a bonanza haha)

Clint
(soon to be...sometime in the next 2-7 years....an RV-8 flyer)
Trikes are for kids!
 
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Scooter01
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RE: GA Exhaust System

Mon Feb 11, 2008 11:47 pm

Well, spring must be in the air...

As I was cooking dinner yesterday with a wide open kitchen window, I noticed a "snaring" sound from outside, not the usual "Piperfart". Looking out and up I saw Norway's only L-19 or O-1 flying by .


Scooter01  biggrin 
There is always a good reason to watch airplanes
 
N231YE
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RE: GA Exhaust System

Fri Feb 15, 2008 12:58 am



Quoting Sprout5199 (Reply 17):

I apologize for partially derailing the thread, but it sure was fun  wink 

Quoting ATCT (Reply 20):
but as I get older...im rapidly becoming a Beech fan lol. (also as I start hanging out in wealthier circles lol...I cant afford a bonanza haha)

Whatever you do, don't become a doctor  wink 

Quoting 2H4 (Reply 18):
I'd still buy N231YE a beer any day of the week.

...that was, after N231YE gave 2H4 a flight in a Piperjet. Unfortunately, I have not passed that magic age of 21, and I don't drink  smile .

...maybe I could get 2H4 a ride in the real N231YE.
 
sccutler
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RE: GA Exhaust System

Fri Feb 15, 2008 2:08 pm

Most all GA aircraft have mufflers, they just don't do that much to "muffle."

As for the whole Cessna vs. Piper thing, I have a simple answer: Beechcraft!

I am quite fond of the short-wing Cherokees, though. I love that sink rate, when I need it.
...three miles from BRONS, clear for the ILS one five approach...
 
Tod
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RE: GA Exhaust System

Fri Feb 15, 2008 4:13 pm



Quoting SCCutler (Reply 23):
Most all GA aircraft have mufflers, they just don't do that much to "muffle."

That's a shame because after the noise nazis are done cracking down on the powerboats and dike bikes planes will follow.
 
KELPkid
Posts: 5247
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RE: GA Exhaust System

Fri Feb 15, 2008 6:45 pm



Quoting Tod (Reply 24):


Quoting SCCutler (Reply 23):
Most all GA aircraft have mufflers, they just don't do that much to "muffle."

That's a shame because after the noise nazis are done cracking down on the powerboats and dike bikes planes will follow.

Don't worry, the Swiss have us covered (STC-wise). You should see some of the elaborate mufflers that common American GA planes have applied in Switzerland  Smile


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Tod
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RE: GA Exhaust System

Fri Feb 15, 2008 9:47 pm



Quoting Tod (Reply 24):
dike bikes

Doh - dirt bikes

Tod

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