X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wr-out-0506.google.com ([64.233.184.233] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2644398 for flyrotary@lancaironline.net; Mon, 14 Jan 2008 10:13:04 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.233.184.233; envelope-from=msteitle@gmail.com Received: by wr-out-0506.google.com with SMTP id 70so539530wra.7 for ; Mon, 14 Jan 2008 07:12:24 -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=cwKIFVD+EA6uZUYall95BBPzjpuBJrNjNPeEbdGY9n0=; b=vn2TJIQdRFADscsb19wq7IPOgiztvE8Uxhm2AN0JvQQzYaF3GRvZLhSh/C5xccjh8h59ibFYhdNkHMcE6bX3mvPE6gmm4EBMMkVoEmZUVoh57NshuY5AzYaOOEC7xpL0Z53vmE/TNhbzJibeNdPQjihVSj7UuKmdurk6zPky93s= 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=EMXWthrOLTmr1kHOchp86yM3nySYecJCDXpcLehqxgEuoPgQ87LvCtBXWT2s43uwYNyLX0euUgVLlnuqo54lYw6CQdCrrdS7e0bl3p9Zi3vrywFWhkzVVJKZUBaLS8NopEKOWujF8G0z61drCqHJFvY3rn1PE0a3bKUlJFEI7eo= Received: by 10.150.139.15 with SMTP id m15mr2453906ybd.99.1200323544538; Mon, 14 Jan 2008 07:12:24 -0800 (PST) Received: by 10.150.178.14 with HTTP; Mon, 14 Jan 2008 07:12:24 -0800 (PST) Message-ID: <5cf132c0801140712w1dd4c6ebsea5a410bdc36ce11@mail.gmail.com> Date: Mon, 14 Jan 2008 09:12:24 -0600 From: "Mark Steitle" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Drips? was [FlyRotary] Re: URL for HushPower In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_3966_27893350.1200323544516" References: ------=_Part_3966_27893350.1200323544516 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline 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 > > ------=_Part_3966_27893350.1200323544516 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline
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?

--
Homepage:  http://www.flyrotary.com/
Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html


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