X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d05.mx.aol.com ([205.188.157.37] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2644425 for flyrotary@lancaironline.net; Mon, 14 Jan 2008 10:28:33 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.37; envelope-from=BMears9413@aol.com Received: from BMears9413@aol.com by imo-d05.mx.aol.com (mail_out_v38_r9.3.) id q.c94.2355ab46 (37118) for ; Mon, 14 Jan 2008 10:27:41 -0500 (EST) Received: from WEBMAIL-MB11 (webmail-mb11.webmail.aol.com [64.12.170.159]) by cia-ma01.mx.aol.com (v121.4) with ESMTP id MAILCIAMA014-90fe478b7f6d2eb; Mon, 14 Jan 2008 10:27:41 -0500 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: Drips? was [FlyRotary] Re: URL for HushPower Date: Mon, 14 Jan 2008 10:27:41 -0500 X-AOL-IP: 65.182.71.8 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: bmears9413@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CA24D922EAF983_7EC_6804_WEBMAIL-MB11.sysops.aol.com" X-Mailer: AOL Webmail 33706-STANDARD Received: from 65.182.71.8 by WEBMAIL-MB11.sysops.aol.com (64.12.170.159) with HTTP (WebMailUI); Mon, 14 Jan 2008 10:27:41 -0500 Message-Id: <8CA24D922EAF983-7EC-32A8@WEBMAIL-MB11.sysops.aol.com> X-Spam-Flag: NO ----------MB_8CA24D922EAF983_7EC_6804_WEBMAIL-MB11.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" 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 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 ! - http://webmail.aol.com ----------MB_8CA24D922EAF983_7EC_6804_WEBMAIL-MB11.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii" 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?


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