Most of the time I fly solo but w/ a passenger  the inherent loud noise
   from the engine
    even with a muffler interferes with the intercom mode of the Bendix/King
   kx125 nav/com.
     I am thinking that I will have to buy a separate intercom for noise
   attenuation. Does
    any one have a recommendation for a manufacturer/model?

    John P

    Just curios John. What does your muffler system look like.
    Got any pictures? Are your rotor housings turbo type
    or normally aspirated?


    Paul Lamar

    The engine is normally aspirated w/ a Stainless works -Smooth tube
   muffler st252425 which is under hung out in the breeze. 240 hrs on
   it to date. Will send a picture next week.

   John P

   Thanks John. I assume the rotor housing exhaust ports look like
   this?

   The muffler looks low aero drag. Sounds like it would be a good second
   muffler along with a tangential under the cowl to quiet the system
   further if it is too loud by itself.

   Hear are the specs on this Smooth Tube 304 SS muffler.

   "2 1/2" ID, center inlet/outlet, standard finish. Exclusive louvered core
   creates a sweet "Street Rod" deep tone that is not overly aggressive. On a
   1-10, 10 being the loudest, these mufflers are a 7. Mufflers are sized so
   that they can be reversed for an even more aggressive sound. Can be welded
   or clamped in place.
   **PHOTOGRAPH SHOWS POLISHED MUFFLER PART NUMBER ST252425P**"

   I would get one of these Harbor Freight Cen Tech Wireless inspection Camera
   and keep an eye on the guts from time to time to make sure they are
   not melting.


   Paul Lamar


 In my experience, intercom noise is usually alternator noise.  You can test
 it by turning off the alternator and see if it fixes the problem.  While
 replacing the intercom may work, you can also probably minimize the problem
 by putting some filters in your intercom power and/or ground leads and by
 shielding them.

 -
 David Leonard

 Turbo Rotary RV-6 N4VY
 http://N4VY.RotaryRoster.net
 http://RotaryRoster.net

                        
_The exhaust outlet does look like your Picture. Attached is a picture of the exhaust muffler hanging below the cowl. Next time I have the cowl off I'll take a picture.
John P

Dave L
You are correct there is a whining sound from either the alternator or my electric gyros. I didn't think of the gyros until on the way home from the a/p. Simple to check next time. What do you use for filters?
John P

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