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HelicopterGasser Model RC HelicoptersOther › TRM231 Noise Level - Various Mufflers
12-02-2007 03:32 AM  9 years agoPost 1
CitationX

rrApprentice

Danville, IN

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I am running a TRM231 with the Century V2 muffler on my Spectra-G. Yes, it is loud but that is because I am used to my nitro machines which are considerably more quiet obviously.

I am curious if anyone has an idea if the Century V3 is quieter than the V2? How about the Hatori gas muffler? Any idea of the noise level of it on a 231?

Thanks

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12-02-2007 12:29 PM  9 years agoPost 2
j.8

rrVeteran

Denmark

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Hi CitationX

I have a Spectra/TRM/Hatori.

Noise limit at our club: 78 dB at a distance of 10 meters,
model 1 meter of the ground.
Mine was testet on a dead quite day, and I`m still allowed
to fly there, but I think I`m very close to the limit.

Regards Bo

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12-02-2007 01:48 PM  9 years agoPost 3
CitationX

rrApprentice

Danville, IN

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I suppose it would help if I had a dB meter. That would make it easier for others running the various engine/muffler combinations to compare.

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12-03-2007 05:23 AM  9 years agoPost 4
Excalibur

rrKey Veteran

Destination: Earth

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Hi CitationX:

This may sound strange, but you could be getting confused on which side of the engine is actually generating more noise. By this, I mean the intake side, not the exhaust side.

When I first started flying my PGasser with a 231 engine, I started with the stock Zenoah muffler and air filter assembly. After a break-in period I put on a V2 muffler and a UFO type air cleaner from Dave's Discount Motors.

What I noticed after a period of time was that when I turned the heli into a side-in hover on the left, was a LOUD raspyness that was emanating from the air cleaner. Because the UFO type air cleaner was a very free-flowing design, there was really nothing to stop the sound waves being generated from the intake side of the engine. In comparison, the stock air filter is a more restricted design and has foam inside that actually helps deaden intake noise as well as filtering.

I guess you could try a different muffler first, but it may be worthwhile to put the original Zenoah air cleaner back on (if not already) for a flight or two. This will help you get a base-line idea of muffler noise with less overall noise in the background. Just something to think about. . .

Xcal

Camper Fuel: It's Not Just for Breakfast Anymore

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12-03-2007 11:10 PM  9 years agoPost 5
rbort

rrProfessor

Franklin, MA - USA

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Definately

Those darned car type air-filters are louder than the stock one! I upgraded to the Minair filter and all I noticed so far is more noise. I wish I could say I noticed more power, unfortunately no and if its there I can't detect it.

The other boo boo is that I lost the choke which assisted in quicker starts and offered an emergency kill switch. I've managed to figure out a way to start it without a choke now by putting the engine on kill and pulling a few times before going to idle.

Anyway my filter seems the loudest at the slowest rpm of 1550. It kinda gives a raspy sound which is a little annoying to say the least. At 1650 idle up 1 everything is louder and it doesn't seem as pronounced as the sound is smoother.

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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12-04-2007 12:22 AM  9 years agoPost 6
CitationX

rrApprentice

Danville, IN

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Air Filter

Raja,

Are you no longer running the stock air filter which I assume is what is on your green & yellow Spectra-G in your gallery? Even though my engine runs fantastic, I still struggle with getting it going off the pull-start. At least the first start of the day. It will top-start with no problem at all. If I ever go to the generator however I won't be able to top-start it. Any secrets for pull starting???

I am running the MA car-type filter with the fancy dancy Spectra-G engraved CF plate. I am all for going quiter and if the stock muffler does the trick, and I can get the choke feature, I may try it. Have you tried the Hatori muffler by chance? I can't tell for sure but does your green machine have the V2 muffler?

Thanks

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12-04-2007 12:45 AM  9 years agoPost 7
Toxic Al

rrApprentice

chuluota, Fl

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Nick you will need to switch to the 644 carb if you use that filter if you want good cold starts.That is the main problem you can not choke it with that set up.Peace, Al

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12-04-2007 12:47 AM  9 years agoPost 8
rbort

rrProfessor

Franklin, MA - USA

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My config

Well yes I went out and bought the Minair air filter to see what all the hype was about and honestly to me I found out its all hype and bling and I couldn't really detect much difference in power if any.

I *AM* starting it with the pull starter and when it was in the 50's I would put the engine on "kill" throttle stick down full trim down, pull it through twice then put it on idle (throttle hold on) and pull it through two more times and it would start. Today I tried to pull it on kill (temp is 32F) and on the 5th pull it started and stayed running on kill a couple of seconds for me to reach the TX and hit throttle hold (back to idle) before it died as it was slowing down as it richened up.

So in short yes you can start it by using the motor air plate as a choke to get it going and no electric start is needed. However in this case more pulls are required (4 to 5) as opposed to 2 with the stock air cleaner/choke.

Quieter is the stock AIR FILTER not the stock muffler. The stock muffler is louder for sure and less power (you can feel that). I use a century v3 muffler on my Spectra-g. I had a v2 before but sold it and got the v3 as its lighter about an ounce and they say more power but I can't tell that. I just see the lighter and that certainly doesn't hurt.

Don't lose the generator option because you think you need the top start. Either put on the stock choke and start it VERY easily with that or just do what I do now with the Minair air cleaner and start it in 4 to 5 pulls.

I tried the Hatori muffler two years ago and a) I didn't like the sound of it (V3 muffler sounds alot better) and b) it didn't stay on and worse it was a 4 bolt system and the inner bolts would loosen up which meant you needed to take the muffler off to get to the inner bolts to tighten them. In short it was a PITA and it wasn't worth its fancy expensive price to boot.

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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12-04-2007 01:13 AM  9 years agoPost 9
CitationX

rrApprentice

Danville, IN

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Stock Air Cleaner

Al,

I sure would hate to have to lose my settings if I switched over to the 644 carb. I put in a lot of time and effort getting there! Not to mention bending your ear after every other time at the field. Anyway, I am really getting used to the peculiarities of this machine. Several people said it would become my go to machine one I got it figured out and it is.

A couple things I still need to do are to install the JR rubber dampeners between the landing gear and the baseplate. Would help to improve my ground clearance. Second, I am running RotorTech 720 all black blades and I really need to put some stripes at the blade tips. I can't tell you how many times I have nearly nipped my shins leaning over to stop the head button! I think the holographic stickers are neat but I would like to do the scale approach and put some sort of stripes on the top of the blade only. Suggestions?

Thanks guys.

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12-04-2007 02:24 AM  9 years agoPost 10
rbort

rrProfessor

Franklin, MA - USA

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Next time

White blades! Never again black. You can't see them and you lose orientation easier without them, not to mention whacking your knees when you try to stop the disk...

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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12-04-2007 04:20 PM  9 years agoPost 11
shuttlepilot

rrElite Veteran

Mullins, South Carolina

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I'm running a Zimmerman tuned muffler on my G26. It's pretty quiet, I was actually suprised at how quiet it is. Like others have said, I find that the intake is quite a bit louder than the muffler side. I'm using the K@N filter that is kind of cone shaped. I like the filter, but I would rather have the pancake style. It may even be a bit more quiet.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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12-04-2007 05:59 PM  9 years agoPost 12
Toxic Al

rrApprentice

chuluota, Fl

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Nick, call me. Peace, Toxic Al

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12-07-2007 10:15 PM  9 years agoPost 13
Helihover

rrApprentice

Norway

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I have tried a lot of different mufflers on the TRM231/ Spectra-G. The loudest by far is the Hattori, with the B. H. Hanson tuned pipe being conisiderably more quiet.

But the Zimmermann pipe is a revelation. The heli is now super-quiet. I have a flying buddy which is totally allergic to noise, and even he was very pleasantly surprised at how quiet the heli was with this setup (he is flying a Sylphide with Fun-Tech muffler and have isolated the canopy with sound deafening material to avoid unwanted noise).

As others also have commented the noise from the intake is a bigger source of noise now than the exhaust.

Helihover

Tried planks, but after all, wood is best on the bonfire.

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