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  • October 19, 2017, 07:37:56 PM

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Author Topic: Muffelers  (Read 481 times)

Online dave siegler

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Muffelers
« on: October 09, 2017, 02:48:59 PM »
I know this is sore subject. 

Our local club field requires use of a reasonable muffler on most days. 

I can get a lot more practice and test time if I use a muffler.  This will be on a Speed limit, fast sized foamie, with a  25 or and F2d With a a 25. 

No landing gear or place to put it. 
 
I know I will have to add tail weight.



How Do I protect the muffler from tearing up the airplane every landing? 

Dave Siegler
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UAS Certificate Number FA39HY9ML7
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Offline mike londke

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Re: Muffelers
« Reply #1 on: October 09, 2017, 02:53:02 PM »
Use a tongue muffler and land inverted.

AMA 48913  USPA D-19580  NRA Life Member  "Don't let the planet sneak up on you"

Offline Tom_Fluker

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Re: Muffelers
« Reply #2 on: October 10, 2017, 11:12:10 AM »
I was going to say flip the motor over to the inboard side - muffler up.

Offline bobsrc

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Re: Muffelers
« Reply #3 on: October 10, 2017, 11:31:14 AM »
Use a K&B Green Head .35 or .19.

Offline Terrence Durrill

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Re: Muffelers
« Reply #4 on: October 10, 2017, 11:44:13 AM »
Use a K&B Green Head .35 or .19.


              Hey Bobsrc, a K&B Greenhead .23.  .29 or .32 would also work nicely (the .09 is a little too small for this application).    D>K       H^^

Offline john e. holliday

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Re: Muffelers
« Reply #5 on: October 10, 2017, 12:29:09 PM »
Here is what I did to my Sweet Sweep so I could fly by my self using a muffled engine.

The aluminum is long enough to clear the prop and matching piece top side under engine lugs.
I was always taught to respect my elders, but it keeps getting harder to find one.
Today I broke my personal record for most consecutive days lived.
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Offline Fredvon4

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Re: Muffelers
« Reply #6 on: October 10, 2017, 01:22:20 PM »
Typical combat plane with short nose and 25 engine does not relate well with a factory standard muffler

But maybe training with RST type slow combat plane where a 2020 OS muffler fits...do not know form OP question

Tongue is good compromise... combat engine max air flow...open all the holes a lot I would think

Simple music wire skid to keep Chip muffler out of the grass should not add too much nose weight

Just random thoughts
"A good scare teaches more than good advice"

"Worry is the interest you pay when you borrow trouble"

"The unpunished never learn"

Fred von Gortler IV

Online Brad LaPointe

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Re: Muffelers
« Reply #7 on: October 11, 2017, 06:29:43 AM »
Dave ,
Now that Autumn rains have started and flying circles are much softer than mid- summer a tongue muffler works well on a F2D plane . Keep the grass a bit long and your props and muffler will thank you .

Brad LaPointe

Offline howard shenton

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Re: Muffelers
« Reply #8 on: October 12, 2017, 08:17:45 AM »
I made an adaptor to allow the tongue muffler to be parallel to the cylinder.
Crude but effective.
Made from alum. angle stock.
Howard Shenton AMA 83412
Mauldin, SC 29662

Online dave siegler

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Re: Muffelers
« Reply #9 on: October 13, 2017, 12:45:40 PM »
Howard, that looks great,

I see the aluminum angle. 

what does the underside look like?
Dave Siegler
AMA 720731
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UAS Certificate Number FA39HY9ML7
Member of the Milwaukee Circlemasters.
A Gold Leader Club for over 25 years!

http://www.circlemasters.com/

Offline howard shenton

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Re: Muffelers
« Reply #10 on: October 13, 2017, 03:34:57 PM »
Dave
Simple angle
Friend of mine welded it for me
Maybe could be JB welded
Design could be improved but was a first start.
Howard
 
Howard Shenton AMA 83412
Mauldin, SC 29662

Offline phil c

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Re: Muffelers
« Reply #11 on: October 13, 2017, 07:17:54 PM »
On the OS engines the stock 2030 muffler works pretty well.  I've done it just moving the pushrod down a notch and adding a wrap of plumbing solder around the end of the boom.  That probably wouldn't work on and F2D.  The OS engines actually seem to run better with the muffler but the weigh is a bit much for competition.

A friend of mine adapted it by cutting off the muffler mount and refitting it so it pressed into the muffler.  He used a couple of small coil springs wrapped around the muffler with grooves in the fins and sealed it in place with hi temp silicone glue.  That tucks the muffler up near the wing and doesn't trip the plane up on landings.
phil Cartier

Offline howard shenton

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Re: Muffelers
« Reply #12 on: Yesterday at 05:22:42 PM »
I weighed the muffler and adapter unit and it came in at:
.5 oz. or
14 gm.
Howard

Howard Shenton AMA 83412
Mauldin, SC 29662


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