X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2644348 for flyrotary@lancaironline.net; Mon, 14 Jan 2008 09:19:32 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([24.74.103.61]) by cdptpa-omta04.mail.rr.com with SMTP id <20080114141852.CGLF29372.cdptpa-omta04.mail.rr.com@edward2> for ; Mon, 14 Jan 2008 14:18:52 +0000 Message-ID: <001f01c856b8$23ec0260$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Drips? was [FlyRotary] Re: URL for HushPower Date: Mon, 14 Jan 2008 09:17:05 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001C_01C8568E.3ADCC1F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_001C_01C8568E.3ADCC1F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 -----=20 From: Mark Steitle=20 To: Rotary motors in aircraft=20 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.=20 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.=20 Ed ----- Original Message -----=20 From: Thomas Jakits=20 To: Rotary motors in aircraft=20 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......." =20 ...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 ------=_NextPart_000_001C_01C8568E.3ADCC1F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Mark, interesting development.  I=20 suspect several reasons you may be the only one to = notice.
 
1.  It might be that the 3 rotor keeps the = average=20 muffler heat level higher as you have (approx 1/3 more heat energy with = the=20 third pulse during the same time interval).
2.  Your muffler is pretty close to the = exhaust port=20 - less chance to lose heat before the muffler
3.  Your muffler is pointed down (mine and = I suspect=20 most are more/less horizontal) and therefore provided an easy path for = the=20 melted packing to drip down.
4.  What does the packing seem like?  = I would=20 have expected glass or ceramic packing - but, a glass packing would be = the more=20 likely of the two to melt.
 
 
  If this is the insulation packing = and it goes,=20 then the shell might get a bit hotter.
 
 
----- Original Message -----
From:=20 Mark = Steitle=20
Sent: Saturday, January 12, = 2008 5:58=20 PM
Subject: [FlyRotary] Re: URL = for=20 HushPower

For rotorheads that are contemplating using (also the = mildly=20 curious) the Flowmaster HP-2 "resonator" muffler,

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

Mark S.



On Jan 12, 2008 3:22 PM, Ed Anderson <eanderson@carolina.rr.com&g= t;=20 wrote:
They are both used stock Rx-7 turbos.  = one is the=20 older model pre 89  and the second is a later model 91 = year.  They=20 both appear to be in working condition in no nicks on the blades and = they=20 spin.  I used compressed air to spin the compressor wheels to = they were=20 really whizzing along.
 
One came with my 91 turbo block and the = other was=20 given to me.
 
Ed
 
 
-----=20 Original Message -----
From:=20 Thomas Jakits
To:=20 Rotary = motors in=20 aircraft
Sent:=20 Saturday, January 12, 2008 3:46 PM
Subject:=20 [FlyRotary] Re: URL for HushPower

Well,

then we just have to keep on looking = for a=20 "justification" for you/your area/etc. :)

Just wait, I'll = find=20 something! :)

Thomas

How about: "..... I=20 have two turbo sitting in my shop......." 

...are = they=20 new/used? What's the scoop on=20 them?

--
Homepage:  http://www.flyrotary.com/
Archive and=20 UnSub:  =20 = http://mail.lancaironline.net:81/lists/flyrotary/List.html
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