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Date: Tue, 8 Mar 2005 16:14:12 -0500
Subject: Re: [FlyRotary] Re: Tangential muffler
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From: Jerry Hey <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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Ed, you are referring to the VAM which did not have a cooling tube,  
just an open end.    It was very loud, I understand.   It was  in  
looking at the VAM that Ed Klepeis and I finally asked each other, what  
if we weld a tube in there?  We still think it is a good idea.  The  
large diameter is also important.  The idea is that the exhaust gases  
will lose heat and energy (sound) as they expand within the can.  Also,  
note the exit pipe (rectangular, 1.75 x 4) is  has a much larger area  
then the two 2" o.d. pipes coming out of the engine.   The idea is to  
create a completely free flowing exhaust  in which the exhaust gases  
become very disorganize as they expand and cool.    Jerry


On Tuesday, March 8, 2005, at 03:50  PM, Ed Anderson wrote:

> Well, I hope it works out.  A somewhat similar muffler (although not as
> large in diameter) with a cooling tube has been tried.  It was fired  
> up at
> Tracy's, it is my opinion that the design failed to mute the exhaust  
> very
> much.  But, not certain how much the two designs have in common other  
> than
> appearances.   Seeing as the exhaust BTU is equivalent to approx twice  
>  the
> heat discharged through the radiators and mufflers together, it is my
> opinion, that its going to take a LOT of cooling air to make any  
> difference
> in temps of the oven.  However, I would love to see it work, I've got  
> the
> room - just can't take the heat. {:>)
>
>
> Ed
>
> ----- Original Message -----
> From: "Jerry Hey" <jerryhey@earthlink.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Tuesday, March 08, 2005 3:33 PM
> Subject: [FlyRotary] Re: Tangential muffler
>
>
>> Thanks for  your comment Ed.  The cool tube is intended to extract a
>> lot of that heat and pump it overboard.   We shall soon see if it  
>> works
>> as Bob White will be  running his engine soon.  I got my fingers
>> crossed.
>>
>>
>>
>>
>> On Tuesday, March 8, 2005, at 03:17  PM, Ed Anderson wrote:
>>
>>> Jerry, Tracy Crook flew with a similar Tangential muffler for a  
>>> number
>>> of
>>> hours.  The neat thing is it does fit under the cowl and suppress  
>>> sound
>>> nicely, the un-neat thing is it acts like a large oven under the cowl
>>> and
>>> keeps cowl temps highly elevated.  I am fairly certain that is why
>>> Tracy
>>> removed it.
>>>
>>> Ed A
>>>
>>>
>>> ----- Original Message -----
>>> From: "Jerry Hey" <jerryhey@earthlink.net>
>>> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>>> Sent: Tuesday, March 08, 2005 3:01 PM
>>> Subject: [FlyRotary] Tangential muffler
>>>
>>>
>>>> From the "other" list comes the report that someone has tested a
>>>> similar exhaust system to what I have been building on his  
>>>> PowerSport
>>>> p
>>>> ported  engine.  .  He reports the muffler worked well to quiet the
>>>> exhaust note and that the engine seemed to breath freely.  The neat
>>>> thing about this exhaust system is that it fits inside the cowl.
>>>> Here are a couple of photos showing the muffler on a Mustang 2. The
>>>> muffler is 6" o.d. x 10 inches long. Construction is 321 16 gage.
>>>> The cool tube running through the center is intended to cool the
>>>> exhaust gas. Fresh air is plumbed through it.    The engine mount is
>>>> the S-beam.      Jerry
>>>>
>>>
>>>
>>> --------------------------------------------------------------------- 
>>> --
>>> -----
>>> ----
>>>
>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>> --------------------------------------------------------------------- 
>>> --
>>> -----
>>> ----
>>>
>>>
>>>>>>  Homepage:  http://www.flyrotary.com/
>>>>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>>>
>>>
>>>
>>>
>>>>>  Homepage:  http://www.flyrotary.com/
>>>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>>
>>
>>
>>>>  Homepage:  http://www.flyrotary.com/
>>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>
>
>
>
>>>  Homepage:  http://www.flyrotary.com/
>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>