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  • August 17, 2019, 03:56:53 PM

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Author Topic: Muffler discovery  (Read 1301 times)

Online Gary Dowler

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Muffler discovery
« on: February 01, 2019, 01:36:03 AM »
Just found out tonight that a OS 2030 muffler fits perfectly on a K&B 40 engine.
I'm probably the 73rd guy in here to figure it out, but I thought it was a neat find.

Gary
Profanity is the crutch of the illiterate mind

Online Perry Rose

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Re: Muffler discovery
« Reply #1 on: February 01, 2019, 05:12:44 AM »
The 843 that comes with the .25LA has the same bolt spacing as the Stalker .51. side exhaust.
I wouldn't take her to a dog fight even if she had a chance to win.
The worst part of growing old is remembering when you were young.

Offline Mark Messmer

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Re: Muffler discovery
« Reply #2 on: February 01, 2019, 05:39:29 AM »
The Brodak 40 muffler fits the Max 40 and 45 FSR  and also the HP 40 .

Offline ericrule

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Re: Muffler discovery
« Reply #3 on: February 01, 2019, 09:26:56 AM »
Bolt spacing is 1.25" so it also fits the OS Max 35S. At RSM ?Distribution we have been manufacturing a tongue muffler weighing 0.02 oz for over 20 years.

Online Paul Walker

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Re: Muffler discovery
« Reply #4 on: February 01, 2019, 10:24:39 AM »
Bolt spacing is 1.25" so it also fits the OS Max 35S. At RSM ?Distribution we have been manufacturing a tongue muffler weighing 0.02 oz for over 20 years.


OK Eric, I know you are good. But really, a 0.02 ounce muffler.
Are you sure you didn't slip a digit somewhere???

Offline ericrule

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Re: Muffler discovery
« Reply #5 on: February 01, 2019, 11:35:22 AM »
Mr. Walker, sir. You are correct.
I am good but really OLD! What's a zero or two between friends?
The correct weight of the muffler is 2/10 oz. The weight should read 0.2 oz

Offline Ara Dedekian

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  • Ara Dedekian
Re: Muffler discovery
« Reply #6 on: February 01, 2019, 12:11:16 PM »


        An OS 762 muffler is an exact match to the spacing on a Fox 35. For convenience, I've run a 4/40 tap into an already tapped (metric) OS muffler and use 4/40 bolts. It works quite well, but it looks like I kept the metric threads on this one.

        Ara

Online Perry Rose

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Re: Muffler discovery
« Reply #7 on: February 03, 2019, 05:25:43 AM »
And the Fox .35 muffler fits the O.S. .40/.46 LA's
I wouldn't take her to a dog fight even if she had a chance to win.
The worst part of growing old is remembering when you were young.

Offline Steve Helmick

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Re: Muffler discovery
« Reply #8 on: February 08, 2019, 12:10:41 PM »
The OS .40/.46LA muffler fits and works really well on a Magnum XLS .36 (or XLS .32, I suppose).  y1 Steve
"The United States has become a place where professional athletes and entertainers are mistaken for people of importance." - Robert Heinlein

In 1944 18-20 year old's stormed beaches, and parachuted behind enemy lines to almost certain death.
 In 2015 18-20 year old's need safe zones so people don't hurt their feelings.  "Be polite, be professional, but have a plan to kill everybody you meet." General Mattis.

Offline Phil Spillman

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Re: Muffler discovery
« Reply #9 on: February 10, 2019, 08:58:12 PM »
I have found this segment quite interesting! Which of these or other tube mufflers will mate up with an ST G21 .40/ .46? Can anyone please help me with this dilemma?

Thanks,

Phil Spillman
Phil Spillman

Offline Paul Smith

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Re: Muffler discovery
« Reply #10 on: February 10, 2019, 09:15:12 PM »

        An OS 762 muffler is an exact match to the spacing on a Fox 35. For convenience, I've run a 4/40 tap into an already tapped (metric) OS muffler and use 4/40 bolts. It works quite well, but it looks like I kept the metric threads on this one.

        Ara

Those "small ears" Foxes won't take any beating at all.  Later Foxes had the full length ears.
Paul Smith

Offline Steve Helmick

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Re: Muffler discovery
« Reply #11 on: February 11, 2019, 12:13:18 PM »
I have found this segment quite interesting! Which of these or other tube mufflers will mate up with an ST G21 .40/ .46? Can anyone please help me with this dilemma?

Thanks,

Phil Spillman


The ST G.21 .40/.46, ST G.51 and ST .60bb all are supposed to be the same bolt pattern. FLOW is another subject. I would not expect good results from a .40 muffler on a G.51 or .60bb.

One of my models flew originally with a Royal .45, then ST G.51 that was drilled for two extra bolts. I came by a used GMA Magnum XL .53 and put it in that model. The mounting bolts matched up with the Royal pattern perfectly. A little fiddling with the notch for NV, and used the same ST muffler as the G.51 (a Randy Aero CNC tube muffler with 4-40 bolts). This doesn't guarantee that a Magnum muffler would fit, because of the 3mm screws being bigger than the 4-40's, but if one was to put 4-40 helicoils in the Magnum muffler, it would probably work ok. But their mufflers are pretty hefty things now, tho not as bad as the OS mufflers. But if you need nose weight....  y1 Steve
"The United States has become a place where professional athletes and entertainers are mistaken for people of importance." - Robert Heinlein

In 1944 18-20 year old's stormed beaches, and parachuted behind enemy lines to almost certain death.
 In 2015 18-20 year old's need safe zones so people don't hurt their feelings.  "Be polite, be professional, but have a plan to kill everybody you meet." General Mattis.

Offline Ron Varnas

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Re: Muffler discovery
« Reply #12 on: February 12, 2019, 02:22:30 AM »
Interesting thread  ;D anyone know an alternative  muffler that would fit the Moki 51 stunt ?

As I've had no success hunting down a factory one pictured  :'(
RJV Melb. Australia

Offline Paul W.

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Re: Muffler discovery
« Reply #13 on: February 15, 2019, 06:18:34 PM »
Interesting thread  ;D anyone know an alternative  muffler that would fit the Moki 51 stunt ?

As I've had no success hunting down a factory one pictured  :'(

What is the mount hole spacing on your Moki 51?

Offline Matt Spencer

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Re: Muffler discovery
« Reply #14 on: February 15, 2019, 09:36:09 PM »
If its 28 M.M. the *^%#! FSR OS / HP  ( and an Enya ) ones'd match .

The Toungue ( C.S.C. ) is rowdie but runs superior , In my experiance .

Thisisa ' pirate ' copy .







Has three holes ( 6 mm ? = depth of OS Exhaust ) in a block of Alloy , with three slots catching them ( half depth ) outlets .

Need to grind a bits end flat , really . to get the end bit . Three holes bored thru. NOT a rectangle ..

Anyone got a real one - I'd like it , or  trade / etc .


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