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Author Topic: Tongue muffler for K&B 40  (Read 2900 times)

Offline Dennis Toth

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Tongue muffler for K&B 40
« on: April 21, 2014, 06:27:28 AM »
Guys,
Am getting a ship ready to get in the air with a K&B 40 for power. I am looking for a tongue muffler that will fit it. The muffler bolts are 1 1/4" apart. Any suggestions for suppliers?

Best,       DennisT

Offline john e. holliday

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Re: Tongue muffler for K&B 40
« Reply #1 on: April 21, 2014, 10:04:31 AM »
Might check the noted suppliers like MECOA  and RSM MFG.   
John E. "DOC" Holliday
10421 West 56th Terrace
Shawnee, KANSAS  66203
AMA 23530  Have fun as I have and I am still breaking a record.

Offline Will Davis

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Re: Tongue muffler for K&B 40
« Reply #2 on: April 21, 2014, 05:19:04 PM »
Dennis,

The muffler mounting hole dimension is the same as a os 35 s.. I know Brodak has a nice tube muffler by big art, might have a tongue muffler too.

I flew a lot in the 90's with the k & b 40, great motor if set up right .
Will Davis
"Carolina Gang"

Offline Motorman

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Re: Tongue muffler for K&B 40
« Reply #3 on: April 22, 2014, 07:17:40 AM »
Which K&B 40 are you talking about 4011, 4050?


MM

Online John Paris

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Re: Tongue muffler for K&B 40
« Reply #4 on: April 22, 2014, 01:14:25 PM »
On my K&B I have found that an OS 20/25 FP or LA size muffler fits.  Can verify tonight.  If so I have some available.  Send me either a PM or email.
John
John Paris
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Offline Dennis Toth

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Re: Tongue muffler for K&B 40
« Reply #5 on: April 22, 2014, 02:10:47 PM »
It is the 4011, I think the OS FP25 muffler fits. Should work better for now then the boat anchor that they came with. I'll check the outlet size and might have to adjust a bit.

Best,       DennisT

Offline Jim Thomerson

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Re: Tongue muffler for K&B 40
« Reply #6 on: April 22, 2014, 03:38:35 PM »
I sawed the connector off a K&B muffler and intended to make a tongue muffler out of it.  I ended up running the stock muffler because I build tail heavy airplanes. D>K

Offline Steve Helmick

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Re: Tongue muffler for K&B 40
« Reply #7 on: April 22, 2014, 06:20:30 PM »
RSM  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.

Offline wwwarbird

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Re: Tongue muffler for K&B 40
« Reply #8 on: April 22, 2014, 09:09:26 PM »

 The Hobby Fasteners tongue mufflers from RSM are the nicest, and lightest, you'll find. y1
Narrowly averting disaster since 1964! 

Wayne Willey
Albert Lea, MN U.S.A. IC C/L Aircraft Modeler, Ex AMA member

Offline Dennis Toth

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Re: Tongue muffler for K&B 40
« Reply #9 on: April 26, 2014, 05:02:39 PM »
Guys,
I flew the K&B 40 with the OS FP25 muffler today. Worked great. The motor was set up with a 0.275" venturi and K&B NVA (I found a few a years back, seem fine I use a piece of fuel tubing to seal the body to the spraybar), all else is stock 4011. Used 7% nitro, 26% oil 40/60 (C/S) fuel with an Enya #3 plug. Prop was a narrow blade 11x5, launched at around 9700 rpm. It was very strong, easy to start (pulled it through twice, 3 flips forward, 3 flips backward, attach battery spinner flip and go). The ship is a 42 1/2oz biplane about 600 sq in. Flew strong solid right on the 4-2 point and it stayed. Eric Rule is sending a tongue muffler that fits the OS FP25 with the 1 1/4" hole spacing, could save another 1 1/2oz. We'll see once it gets here.

Best,         DennisT


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