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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Are all mufflers plagued?
01-02-2014 09:23 PM  4 years agoPost 21
turboomni

rrProfessor

East of the Equator

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The QD are extremely well made and hold up to a pounding like no gasser muffler I have seen, It is nice to have them as another option.
They are interesting and obviously durable,,I wished they could also make a muffled pipe that is less peaky with a broader power band also instead of going right to 6.5 hp with a narrow power band. A mild power increase with good muffling pipe would be very welcome to many heli guys. Especially with good durability.

Setup is everything, All my heli's can fly far better than I can pilot them

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01-03-2014 06:41 AM  4 years agoPost 22
Toddc72

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weed,ca-usa

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The motor port timing and layout has an effect on this also. So will gearing. The pipes have a broad power band but there are so many variables that can effect the outcome of it. Tom has it correct in his statement also about things. We did a pipe for one of our motors once. Had nothing down low or midrange power. When it hit the rpm it came on at it hard BUT only had about a 1,000 rpm range was it.

Todd

Quickdraw

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01-03-2014 04:44 PM  4 years agoPost 23
turboomni

rrProfessor

East of the Equator

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Can't they after the header pipe just have a muffler that doesnt tune at all and just acts like a muffler but looks somewhat like a pipe?

Setup is everything, All my heli's can fly far better than I can pilot them

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01-03-2014 10:37 PM  4 years agoPost 24
mustang67ford

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Central Pennsylvania

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Where can you buy the different mufflers at; excluding century.

Team HeliProz - Retired
AMA #513507
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01-04-2014 12:22 AM  4 years agoPost 25
fastflyer20

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N. Tonawanda, NY

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http://www.helidirect.com/rjx-90-ga...6cc-p-20877.hdx

Hobby King - I can't get link to work, go under "Gas/Glow engines and parts" and select mufflers/silencers

http://www.hatoriusa.com/?page_id=2
Bottom of the page, looks like you can buy them direct from Hatori USA

http://www.airstarintl.com/index.ph...lencer-set.html

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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01-04-2014 12:59 AM  4 years agoPost 26
turboomni

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East of the Equator

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http://www.airstarintl.com/index.ph...lencer-set.html

That is similar to the one in my 1005 Min Air although the mounting tangs are in a different place. Dont know if it will fit a Whip. And you will need a header and a teflon coupler.

Setup is everything, All my heli's can fly far better than I can pilot them

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01-04-2014 01:02 AM  4 years agoPost 27
mustang67ford

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Central Pennsylvania

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Thanks for the info. However, i could 't find any mufflers on hobby kings website, airstar didn't have any regular zimmerman mufflers, and hatori didn't list any prices.

The zimmerman mufflers on the airstar site was a rear mounted one or one with a header which i do not know if either will work on a raptor 90. They were both neat looking though especally the side mounted one with header. Anybody know?

Where can i find the basic Zimmerman muffler that bolts to the motor without a header?

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01-04-2014 03:42 AM  4 years agoPost 28
fastflyer20

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N. Tonawanda, NY

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Click on the Hatori "buy now" link and you will see the price

I gave you the instructions above on where to find the HK muffler

Be adventurous and click around, the web has a ton of info out there.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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01-04-2014 04:11 AM  4 years agoPost 29
mustang67ford

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Central Pennsylvania

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Thanks. Didn't want to hit the buy it now and end up having a muffler being shipped to me.

Team HeliProz - Retired
AMA #513507
IRCHA #4011

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01-04-2014 04:47 AM  4 years agoPost 30
turboomni

rrProfessor

East of the Equator

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They wont charge you as they have no idea what your card is

Setup is everything, All my heli's can fly far better than I can pilot them

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01-04-2014 09:25 AM  4 years agoPost 31
Toddc72

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weed,ca-usa

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turboomni

What you are describing would be like a short header pipe with the silencer on it. We tried this setup before on our engines when we were looking at building motors for Madera airplane races. They made power down low and if I remember right did not like to rev high. We lost 2hp right off by doing that setup. I can not remember what the max rpm range was. Been over 20 years ago when we tried that.

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01-04-2014 02:28 PM  4 years agoPost 32
turboomni

rrProfessor

East of the Equator

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What you are describing would be like a short header pipe with the silencer on it.
Yes ,,just a different looking muffler system that does the same thing as the RJX, Hatori,Century mufflers. It just looks different but does the same thing. Only reason I mention it is because the header rarely breaks or splits or leaks unlike some mufflers we now use. When you say it lost 2 hp is that compared to a tuned pipe system? Would that be the same power as just a muffler then? If so that would be fine as long as it is quiet enough.

Setup is everything, All my heli's can fly far better than I can pilot them

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01-06-2014 01:03 AM  4 years agoPost 33
Toddc72

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weed,ca-usa

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I do not remember if we ever dynoed it with the black box stock muffler on it? It was a long time ago when we tried it. Yes the power difference was in comparison to the tuned pipe. The header we did was just a section cut off from our tuned pipe and than exited like a straight pipe. Noise was not an issue back than at the airport where they raced so open headers was ok. It would just get quieter with a silencer attached to the end of it is all. Do not know how it would compare to one of the tuned mufflers of nowadays? Something could be done by using one of our silencers attached to a header system.

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01-06-2014 01:14 AM  4 years agoPost 34
turboomni

rrProfessor

East of the Equator

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Something could be done by using one of our silencers attached to a header system.
That would be very interesting!

Setup is everything, All my heli's can fly far better than I can pilot them

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