X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from el-out-1112.google.com ([209.85.162.181] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2644457 for flyrotary@lancaironline.net; Mon, 14 Jan 2008 10:55:37 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.162.181; envelope-from=msteitle@gmail.com Received: by el-out-1112.google.com with SMTP id o28so210463ele.1 for ; Mon, 14 Jan 2008 07:54:58 -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=GnjCG+i5/a3U1jYQ8VAeIQVNXX8ohMbv8N/FsAed87w=; b=NMalumGFQsXFBAAIGRpqq6GGddezju1LKwXfqXoMM9fqOW4nBSwtbsl4h8xrkOOqDDipLnVAJt2QYnPFq2geTnFjBY3TGhxSSjTBrqtFa0Fa5QZo5FiRqtDGIXSrMkL0vcwsqmRZQWpcBmV8PCMamkpT/dYJ2u9W3mdUx7PLchM= 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=Bf25rYnQKLExvOg1x9paCP+6fHz05JiJYj2ycNzSCnGaG8/DsqL69OiMTDCmo1quL0QMRrnP0LHdk13u2Mq6xISfjc5pBEsffmh6BCVsraTQnnCFKjLr/VsoHLn2A/1GPmVzpGTJ8P9jcomRdGwmSGDhO4Q4MEwLGZkTq5xbbXE= Received: by 10.150.140.6 with SMTP id n6mr2471010ybd.111.1200326098743; Mon, 14 Jan 2008 07:54:58 -0800 (PST) Received: by 10.150.178.14 with HTTP; Mon, 14 Jan 2008 07:54:58 -0800 (PST) Message-ID: <5cf132c0801140754m645956dbmf0dd90b0bbe5620b@mail.gmail.com> Date: Mon, 14 Jan 2008 09:54:58 -0600 From: "Mark Steitle" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Drips? was [FlyRotary] Re: URL for HushPower In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_4062_674551.1200326098733" References: ------=_Part_4062_674551.1200326098733 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Sorry to say, but I agree. I'm thinking of stuffing my HP-2 with SS shavings. Mark On 1/14/08, bmears9413@aol.com wrote: > > Im real worried about my noise factor. twelve pipes right in front of me. > no muffler. each 1 1/2" exhaust pipe actually has a 3/4 hole to exhaust out > of. im hoping that will quiet it a bit....but im pretty sure im full of > crap....its gonna be toooooo loud. > > Bob Mears > > > -----Original Message----- > From: Mark Steitle > To: Rotary motors in aircraft > Sent: Mon, 14 Jan 2008 9:39 am > Subject: [FlyRotary] Re: Drips? was [FlyRotary] Re: URL for HushPower > > The problem with the auger muffler is that everyone said it sounded like > a flying weed-eater. It was sometimes described as a flying chainsaw. Not > the most flattering description. It wasn't "that" loud, but you could > definitely hear me coming from miles out. Maybe that's a good thing? > > I guess we'll soon find out what the HP-2 sounds like with no packing. > > Mark > > > On 1/14/08, bmears9413@aol.com wrote: > > > > Mark, > > I thought your spiral muffler you built was quiet. Did it turn out to be > > too loud after you got in the air? Or too much back pressure? > > > > Bob Mears > > > > > > -----Original Message----- > > From: Mark Steitle > > To: Rotary motors in aircraft < flyrotary@lancaironline.net> > > Sent: Mon, 14 Jan 2008 9:12 am > > Subject: [FlyRotary] Re: Drips? was [FlyRotary] Re: URL for HushPower > > > > Ed, > > I don't think it was doing this until after shutdown. That makes sense > > as all the heat builds with no airflow over the muffler. It would probably > > be wise to put a SS heat shield between the muffler and the fuselage floor. > > (I had a piece of Zetex installed, but hadn't waited long enough for the RTV > > to cure and it started coming off during flight. I will try a fresh piece, > > and wait a little longer this time. > > > > You're probably right on 1 though 4. I suspect the packing material to > > be fiberglass. I doubt that ceramic would melt that easily. > > > > Mark > > Packing, I don't need no stink'in packing! > > > > > > On 1/14/08, Ed Anderson wrote: > > > > > > Hi Mark, interesting development. I suspect several reasons you may > > > be the only one to notice. > > > > > > 1. It might be that the 3 rotor keeps the average muffler heat level > > > higher as you have (approx 1/3 more heat energy with the third pulse during > > > the same time interval). > > > 2. Your muffler is pretty close to the exhaust port - less chance to > > > lose heat before the muffler > > > 3. Your muffler is pointed down (mine and I suspect most are > > > more/less horizontal) and therefore provided an easy path for the melted > > > packing to drip down. > > > 4. What does the packing seem like? I would have expected glass or > > > ceramic packing - but, a glass packing would be the more likely of the two > > > to melt. > > > > > > > > > If this is the insulation packing and it goes, then the shell might > > > get a bit hotter. > > > > > > > > > > > > ----- Original Message ----- > > > *From:* Mark Steitle > > > *To:* Rotary motors in aircraft > > > *Sent:* Saturday, January 12, 2008 5:58 PM > > > *Subject:* [FlyRotary] Re: URL for HushPower > > > > > > > > > For rotorheads that are contemplating using (also the mildly curious) > > > the Flowmaster HP-2 "resonator" muffler, > > > > > > I installed the HP-2 today on my 20B and was able to do a run-up. > > > Bobby Hughes and I both agree that the exhaust tone is much, much mellower > > > with a deeper tone. My Lighspeed ANR headset had no problem cancelling out > > > this low-frequency exhaust tone. While the overall sound level was still > > > pretty significant, the exhaust tone was much more pleasant to the ears. > > > The ear-piercing, glass shattering, nails-on-the-chalkboard, > > > make-you-bleed-from-the-ears, exhaust tone is totally tamed. The 3-blade > > > M/T prop is the primary noisemaker now. The test took place between two > > > rows of hangars, so I feel that DB readings are not very realistic. I'll > > > take those again out on the ramp and post the numbers. If the HP-2 holds up > > > to the pounding of the rotary's exhaust, I'll be a very happy camper. > > > > > > Mark S. > > > > > > > > > > > > On Jan 12, 2008 3:22 PM, Ed Anderson > > > wrote: > > > > > > > They are both used stock Rx-7 turbos. one is the older model pre > > > > 89 and the second is a later model 91 year. They both appear to be in > > > > working condition in no nicks on the blades and they spin. I used > > > > compressed air to spin the compressor wheels to they were really whizzing > > > > along. > > > > > > > > One came with my 91 turbo block and the other was given to me. > > > > > > > > Ed > > > > > > > > > > > > > > > > ----- Original Message ----- > > > > *From:* Thomas Jakits > > > > *To:* Rotary motors in aircraft > > > > *Sent:* Saturday, January 12, 2008 3:46 PM > > > > *Subject:* [FlyRotary] Re: URL for HushPower > > > > > > > > > > > > Well, > > > > > > > > then we just have to keep on looking for a "justification" for > > > > you/your area/etc. :) > > > > > > > > Just wait, I'll find something! :) > > > > > > > > Thomas > > > > > > > > How about: "..... I have two turbo sitting in my shop......." > > > > > > > > ...are they new/used? What's the scoop on them? > > > > > > > > > > > ------------------------------ > > > -- > > > Homepage: http://www.flyrotary.com/ > > > Archive and UnSub: > > > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > > > > > > > > > ------------------------------ > > More new features than ever. Check out the new AOL Mail > > ! > > > > > > > ------------------------------ > More new features than ever. Check out the new AOL Mail > ! > > ------=_Part_4062_674551.1200326098733 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline
Sorry to say, but I agree.  I'm thinking of stuffing my HP-2 with SS shavings. 
 
Mark

 
On 1/14/08, bmears9413@aol.com <bmears9413@aol.com> wrote:
Im real worried about my noise factor. twelve pipes right in front of me. no muffler. each 1 1/2" exhaust pipe actually has a 3/4 hole to exhaust out of. im hoping that will quiet it a bit....but im pretty sure im full of crap....its gonna be toooooo loud.

Bob Mears


-----Original Message-----
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft < flyrotary@lancaironline.net>
Sent: Mon, 14 Jan 2008 9:39 am
Subject: [FlyRotary] Re: Drips? was [FlyRotary] Re: URL for HushPower

The problem with the auger muffler is that everyone said it sounded like a flying weed-eater.  It was sometimes described as a flying chainsaw.  Not the most flattering description.  It wasn't "that" loud, but you could definitely hear me coming from miles out.  Maybe that's a good thing? 
 
I guess we'll soon find out what the HP-2 sounds like with no packing. 
 
Mark

 
On 1/14/08, bmears9413@aol.com < bmears9413@aol.com> wrote:
Mark,
I thought your spiral muffler you built was quiet. Did it turn out to be too loud after you got in the air? Or too much back pressure?

Bob Mears


-----Original Message-----
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft < flyrotary@lancaironline.net>
Sent: Mon, 14 Jan 2008 9:12 am
Subject: [FlyRotary] Re: Drips? was [FlyRotary] Re: URL for HushPower

Ed,
I don't think it was doing this until after shutdown.  That makes sense as all the heat builds with no airflow over the muffler.  It would probably be wise to put a SS heat shield between the muffler and the fuselage floor.  (I had a piece of Zetex installed, but hadn't waited long enough for the RTV to cure and it started coming off during flight.  I will try a fresh piece, and wait a little longer this time. 
 
You're probably right on 1 though 4.  I suspect the packing material to be fiberglass.  I doubt that ceramic would melt that easily. 
 
Mark
Packing, I don't need no stink'in packing!

 
On 1/14/08, Ed Anderson <eanderson@carolina.rr.com > wrote:
Hi Mark, interesting development.  I suspect several reasons you may be the only one to notice.
 
1.  It might be that the 3 rotor keeps the average muffler heat level higher as you have (approx 1/3 more heat energy with the third pulse during the same time interval).
2.  Your muffler is pretty close to the exhaust port - less chance to lose heat before the muffler
3.  Your muffler is pointed down (mine and I suspect most are more/less horizontal) and therefore provided an easy path for the melted packing to drip down.
4.  What does the packing seem like?  I would have expected glass or ceramic packing - but, a glass packing would be the more likely of the two to melt.
 
 
  If this is the insulation packing and it goes, then the shell might get a bit hotter.
 
 
----- Original Message -----
Sent: Saturday, January 12, 2008 5:58 PM
Subject: [FlyRotary] Re: URL for HushPower

 
For rotorheads that are contemplating using (also the mildly curious) the Flowmaster HP-2 "resonator" muffler,

I installed the HP-2 today on my 20B and was able to do a run-up.  Bobby Hughes and I both agree that the exhaust tone is much, much mellower with a deeper tone.  My Lighspeed ANR headset had no problem cancelling out this low-frequency exhaust tone.  While the overall sound level was still pretty significant, the exhaust tone was much more pleasant to the ears.  The ear-piercing, glass shattering, nails-on-the-chalkboard, make-you-bleed-from-the-ears, exhaust tone is totally tamed.  The 3-blade M/T prop is the primary noisemaker now.  The test took place between two rows of hangars, so I feel that DB readings are not very realistic.  I'll take those again out on the ramp and post the numbers.  If the HP-2 holds up to the pounding of the rotary's exhaust, I'll be a very happy camper.

Mark S.



On Jan 12, 2008 3:22 PM, Ed Anderson <eanderson@carolina.rr.com> wrote:
They are both used stock Rx-7 turbos.  one is the older model pre 89  and the second is a later model 91 year.  They both appear to be in working condition in no nicks on the blades and they spin.  I used compressed air to spin the compressor wheels to they were really whizzing along.
 
One came with my 91 turbo block and the other was given to me.
 
Ed
 
 
----- Original Message -----
Sent: Saturday, January 12, 2008 3:46 PM
Subject: [FlyRotary] Re: URL for HushPower

 
Well,

then we just have to keep on looking for a "justification" for you/your area/etc. :)

Just wait, I'll find something! :)

Thomas

How about: "..... I have two turbo sitting in my shop......." 

...are they new/used? What's the scoop on them?


 
More new features than ever. Check out the new AOL Mail!
 

 
More new features than ever. Check out the new AOL Mail!
 

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