Air filters

[Fletcher, Richard]

Good question. On my 150 cc twin, when I use a smaller prop that rips, the
sound is unreal, sort of a cross between a full scale racing plane and a
jet. We all love the sounds our planes make but our neighbors and other club
members don't always share our appreciation of the noise. 
 
Just received my Focus II, OS 160, pump, props, etc. !!! I'm all happy now,
fondling my new goodies ...
 
 
 
 
Rich  :)
 
 
 
 -----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On
Behalf Of Richard Strickland
Sent: Friday, August 13, 2004 5:46 PM
To: discussion at nsrca.org
Subject: Re: Air filters



It's Friday--going to Omaha--I was thinking about what it was about the
noise we liked: My Company is oriented to designing and implementing
Automotive Conveyor Systems(KC--Conveyortown USA) and most of our union
Millwrights and Ironworkers have Harleys(we also have the KC Plant's maint.
contract).  These guys will go buy a new $20,000.00+ bike, ride it directly
to the mod shop and put on straight pipes.  What'd ya do THAT for?  "So it
sounds like a MOTORCYCLE!"    Pattern ships used to scream--it was what a
pattern airplane was SUPPOSED to sound like........but our ears used to ring
for a few days following a contest then also.........Have a great weekend
and thanks again for all the help.
                Richard

----- Original Message ----- 
From: Richard Strickland <mailto:richard.s at allied-callaway.com>  
To: discussion at nsrca.org <mailto:discussion at nsrca.org>  
Sent: Thursday, August 12, 2004 1:00 PM
Subject: Re: Air filters

We were looking for ANY way to quiet those suckers down.  My deal was
running a  RE short stroke Rossi in a heavy, clean E-HUGE-1A and turning an
11-7.5 wood prop 18,000+ on the backside of a Split-S.  It was great.
LOUD--but great.  The pipes would RING.  Prop flutter was an issue along
with airframe and pipe noise, engine speed, etc., etc......... No question
the newer stuff is more capable and the patterns more challenging--but I
don't know if they are more FUN.  Part of the enjoyment was going out and
making some serious racket.
 
RS

----- Original Message ----- 
From: Jim_Woodward at beaerospace.com <mailto:Jim_Woodward at beaerospace.com>  
To: discussion at nsrca.org <mailto:discussion at nsrca.org>  
Sent: Thursday, August 12, 2004 12:35 PM
Subject: Re: Air filters


Hi All, 

I was under the impression that the real cause of excessive noise was prop
(rpm & diameter).  The actual engine noise and exhaust setup (by todays
typical standard) was not the significant cause of noise - the prop is the
culprit.  
Jim W.





	<tony at radiosouthrc.com <mailto:tony at radiosouthrc.com> > 
Sent by: discussion-request at nsrca.org <mailto:discussion-request at nsrca.org>



08/12/2004 01:32 PM 
Please respond to tony 


        
        To:        <discussion at nsrca.org> 
        cc:         
        Subject:        Re: Air filters	



Richard:
I make one for the OS 160... 
  
Tony Stillman
Radio South
3702 N. Pace Blvd.
Pensacola, FL 32505
1-800-962-7802
 <http://www.radiosouthrc.com/> www.radiosouthrc.com 
----- Original Message ----- 
From:  <mailto:richard.s at allied-callaway.com> Richard Strickland 
To:  <mailto:discussion at nsrca.org> NSRCA 
Sent: Thursday, August 12, 2004 10:37 AM 
Subject: Air filters 

Anyone, 
  
When we first started trying to quiet things down, one of the areas we
looked at was intake noise.  We used to use a stretch on filter housing with
small filter disks that helped the noise problems with the added benefit of
keeping crap out of the engine--gee, what a concept.  Are there any such
animals available now?  We fly off an old asphalt runway and there is the
possibility something significant was sucked into a brand new 170 and
destroyed the piston, sleeve, ring and bearing.  First time for everything,
I guess.  The 60 sized ones did not seem to affect performance. 
  
Thanks, 
  
Richard 



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