X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.233.178.244] (HELO hs-out-2122.google.com) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2640192 for flyrotary@lancaironline.net; Thu, 10 Jan 2008 20:27:28 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.233.178.244; envelope-from=msteitle@gmail.com Received: by hs-out-2122.google.com with SMTP id k27so908154hsc.3 for ; Thu, 10 Jan 2008 17:26:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; bh=o0OCEXrU5FRtQwK3qDv6ivO4gv664P6Plpvg4uSpbI8=; b=FPzrc6LB8+KpWaHkBuod2xt9no6zp7jBVwaaefpr8Sc/Ninn5NMxD3rFuukdKjOg0NXgMhMcRHnswSR3Ca+cYOc+gK/Gfz/hoNj5qURj0VwCv3VqJuIGk8um+OciGcKPfKcY9CNap7pRbtlQKFj5/9Cu9kaeKm7GzAm+kQy2yPQ= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=HBGr96f5RNhyn7RsOghCUq/zI/ZaJLRJ+8z7ij7rn22voiOrOA5E7CbROI+yneo/kTAnn/OTFEZU7Y/orY0gpzGAcGOZ5MVQQSKB6kywOiCRU65i90AQV4XQ5Q4NxPkV0GhX4y7LCcnPpRKfmYFZqnSNSqbpkEAKFjQaeFgSPg4= Received: by 10.150.211.19 with SMTP id j19mr1084954ybg.10.1200014810676; Thu, 10 Jan 2008 17:26:50 -0800 (PST) Received: by 10.150.146.16 with HTTP; Thu, 10 Jan 2008 17:26:50 -0800 (PST) Message-ID: <5cf132c0801101726s787f0758jec8473261ea6f37d@mail.gmail.com> Date: Thu, 10 Jan 2008 19:26:50 -0600 From: "Mark Steitle" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Fw: [FlyRotary] Re: Dennis' Muffler In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_31362_6391105.1200014810668" References: ------=_Part_31362_6391105.1200014810668 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Ed, You're probably right. But since I already have the muffler in hand, I plan on going ahead and giving it a try. Dennis H. seems to be very happy with his HP-2, but he's running a Renesis with the factory manifold (slightly modified) and a small tangential muffler to boot. So, the exhaust has lost much of its bark before it ever reaches the HP-2. Now my system is totally different. First of all it is a 20B with turbo exhaust inserts. The exhaust makes a sweeping 90* turn into a 3" collector pipe and then directly into the HP-2. The closest rotor only has about 18" before reaching the muffler. But the way I look at it is that even with the packing blown out it will be quieter than what I have now. How's that for rationalization? I'll try to remember to take before and after sound readings. Mark S. On Jan 10, 2008 6:32 PM, Richard Nadig wrote: > Ed, > I installed a Hushpower II on my 13b and it was noticeably quieter .... > for a while. It is now quite noisy and I intend to put the old square > muffler back on. The Hushpower has turned powder gray on the out side like > it has become hot > > Rich > > *Ed Anderson * wrote: > > Well, you could be correct, Mark. > > However, even looking at the exploded view of the one you posted, it > still looks to me that the only packing shown is the insulation packing > (looks like approx 1/2" thick") around the peripheral of the shell. > > Now that is the resonator, while I have the full up muffler - and I > carefully checked for packing because my experience has shown no sound > absorbent packing will last more than a few hours with my engine. I could > detect no packing material by shinning a light down the ends - but, that > does not prove its not there. Just see no evidence of it. > > I even tried some 2000F rated ceramic material for packing - it withstood > the heat just fine, but the pulses blasted it into pieces within 1 hour of > flight time (perhaps even less). 13Bs without the turbo block or the > Renesis may be kinder {:>) > > My 0.02 > > Ed > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > > ------------------------------ > Never miss a thing. Make Yahoo your homepage. > ------=_Part_31362_6391105.1200014810668 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Ed,
You're probably right.  But since I already have the muffler in hand, I plan on going ahead and giving it a try.  Dennis H. seems to be very happy with his HP-2, but he's running a Renesis with the factory manifold (slightly modified) and a small tangential muffler to boot.  So, the exhaust has lost much of its bark before it ever reaches the HP-2.

Now my system is totally different.  First of all it is a 20B with turbo exhaust inserts.  The exhaust makes a sweeping 90* turn into a 3" collector pipe and then directly into the HP-2.  The closest rotor only has about 18" before reaching the muffler.  But the way I look at it is that even with the packing blown out it will be quieter than what I have now.  How's that for rationalization?  I'll try to remember to take before and after sound readings. 

Mark S.

On Jan 10, 2008 6:32 PM, Richard Nadig <blueren@yahoo.com> wrote:
Ed,
I installed a Hushpower II on my 13b and it was noticeably quieter .... for a while.  It is now quite noisy and I intend to put the old square muffler back on.  The Hushpower has turned powder gray on the out side like it has become hot
 
Rich

Ed Anderson <eanderson@carolina.rr.com> wrote:
Well, you could be correct, Mark. 
 
 However, even looking at the exploded view of the one you posted, it still looks to me that the only packing shown is the insulation packing  (looks like approx 1/2" thick") around the peripheral of the shell. 
 
 Now that is the resonator, while I have the full up muffler - and I carefully checked for packing because my experience has shown no sound absorbent packing will last more than a few hours with my engine.  I could detect no packing material by shinning a light down the ends - but, that does not prove its not there.  Just see no evidence of it.
 
I even tried some 2000F rated ceramic material for  packing - it withstood the heat just fine, but the pulses blasted it into pieces within 1 hour of flight time (perhaps even less).  13Bs without the turbo block or the Renesis may be kinder {:>)
 
My 0.02
 
Ed
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