Isaac F

Hey, maybe you guys can help me. Do any of you have one of this Dubro Muff-L-Aire that want to sell it to me? I can pay you with Pay Pal.

I need the one that fit a 50 size engine (Webra 50) There is no noise regularion in my country so I can use it without any problem :-)

THX,

Isaac

bob27s

My Feedback: (19)

oh my.......
I used one of those on a scale plane many years ago. Big mistake.

Ya really don't to use one of those do you?
No back pressure, nearly no muffler/tank pressure, and no quiet.....
At best, it directs the exhaust out of the cowl.

You can get the same result from bolting on a set of 3-4 exhaust extension pieces.

or at least try one of the CL stunt tonge mufflers... like this one

http://www.brodak.com/shop_productde...ProductID=6687

(The ST50 bolt pattern should match the webra)
http://www.brodak.com/shop.php?CategoryID=30

Just a suggestion.... the CL mufflers are fairly easy to come by

Bob

mmattockx

Bob,

Do these perform at all well? I assume they are very loud, but how does the engine run on one? Lots of rpm, or lots of lost power? I have a couple of planes in mind that could use the tiny size.


Thanks,
Mark

bob27s

My Feedback: (19)

well.... lets put it this way, the CL mufflers tend to be quieter than the Dubro stack and they will perform about the same.

Those I linked to are tested fairly well and provide decent exhaust flow (not overly restrictive). There are others similar.

They are not made to boost power at all... CL engines run at lower rpm, constant speed. These are just to be light, simple, and they get the exhaust off of the plane. And they lower the exhaust note a bit too... so at the lower RPM they are acceptable mufflers.

The lite-jett muffler is sorta the same thing, just a bit quieter. No boost here, but also no loss. We use them on the SJ-60L "hover" engine and also the BSE-76L engine as standard equipment since they weight next to nothing. (note... the one that says .40 is for a 40L engine - that is, the 30 size block, the larger one is the 46-60L size)

Bob

Mike Connor

My Feedback: (5)

I used to run a similar muffler in the early 80's on a OS 45 FSR. Small, light, noticeably louder, adequate tank pressure and good power.

Isaac F

Hey Bob,

Yes is for a scale T-34 Mentor Thx so much for the link

Isaac

bob27s

My Feedback: (19)

Oh.............. gottcha.

T-34 and Bonanza are tough installations ... nose gear is right under the engine......


See if you can find one of the Tatone EM "mufflers" somewhere.....
Might be an option, and should fit...

http://www.mecoa.com/cbtatone/10.htm

Bob

Barticusmax

I used the Muff-l -Air, a lot years back. All mine had a set screw that you could adjust to compress the "Baffle Spring" and reduce the noise while increasing the back/tank pressure. I don't think a lot of folks knew about the adjustment. Tough to get adjusted right, but fairly effective until you change props.
Barticusmax

Isaac F

Well, I going to follow Bob´s advise and I will place an order on one of this CL stunt tonge mufflers... like this one

http://www.brodak.com/shop_productde...ProductID=6687

I hope it perfom OK

Isaac

Isaac F

Well today I received my Brodak tongue muffler. My only concern is that is look very small and I dont know if it going to chock the engien (allow it to brief) Here is a pic of the muffler installed just fopr the pic on a Webra 52 heli engine.

The instrucction that come with it says it work from 40,50 and 60 size engines

I will use it on a Webra 50GT Speed.

What you guys think

Isaac

bob27s

My Feedback: (19)

Only way to find out.... give it a try...

the CL engines turn 10K - 13K rpm on average.... and the muffler works well there.