X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2644982 for flyrotary@lancaironline.net; Mon, 14 Jan 2008 15:29:25 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([24.74.103.61]) by cdptpa-omta04.mail.rr.com with SMTP id <20080114202844.JCIM29372.cdptpa-omta04.mail.rr.com@edward2> for ; Mon, 14 Jan 2008 20:28:44 +0000 Message-ID: <000b01c856eb$d0ebd980$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Drips? was [FlyRotary] Re: URL for HushPower Date: Mon, 14 Jan 2008 15:26:59 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01C856C1.E7E15400" 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_0008_01C856C1.E7E15400 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bob, I have a friend (not on the list) who tried them with a 13B on his = GlasStar and his opinion was that they did not stand up to the rotary = exhaust pounding and did not reduce the noise sufficient to justify the = cost. He now flies with a SpinTech Ed=20 ----- Original Message -----=20 From: bmears9413@aol.com=20 To: Rotary motors in aircraft=20 Sent: Monday, January 14, 2008 3:20 PM Subject: [FlyRotary] Re: Drips? was [FlyRotary] Re: URL for HushPower Has anyone tried a supertrap muffler? I ran them back in my motorcycle = racing days and was impressed with ther perfrmance and the hush factor. = http://www.supertrapp.com/product_sections/detail.asp?CatID=3D32&ItemID=3D= 549-3019 Bob Mears Supermarine Spitfire -----Original Message----- From: Ed Anderson To: Rotary motors in aircraft Sent: Mon, 14 Jan 2008 2:05 pm Subject: [FlyRotary] Re: Drips? was [FlyRotary] Re: URL for HushPower Well, Mark, I tried that. Actually I tried both SS pot scrubbers as = well as SS machining shavings. They withstand the heat with no problem, = but the shock of the exhaust soon pound them into small pieces that get = blown out of the muffler. However, I did not tried stuffing a HushPower = II. Ed ----- Original Message -----=20 From: Mark Steitle=20 To: Rotary motors in aircraft=20 Sent: Monday, January 14, 2008 10:54 AM Subject: [FlyRotary] Re: Drips? was [FlyRotary] Re: URL for = HushPower Sorry to say, but I agree. I'm thinking of stuffing my HP-2 with SS = shavings. =20 Mark =20 On 1/14/08, bmears9413@aol.com wrote:=20 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.=20 Bob Mears -----Original Message----- From: Mark Steitle 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=20 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? =20 I guess we'll soon find out what the HP-2 sounds like with no = packing. =20 Mark =20 On 1/14/08, bmears9413@aol.com < bmears9413@aol.com> wrote:=20 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?=20 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=20 Ed,=20 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. =20 You're probably right on 1 though 4. I suspect the packing = material to be fiberglass. I doubt that ceramic would melt that easily. = =20 Mark Packing, I don't need no stink'in packing! =20 On 1/14/08, Ed Anderson wrote:=20 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 =20 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:=20 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.=20 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 =20 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 =20 ------------------------------------------------------------------------ More new features than ever. Check out the new AOL Mail! =20 =20 -------------------------------------------------------------------------= - More new features than ever. Check out the new AOL Mail! =20 -------------------------------------------------------------------------= ----- More new features than ever. Check out the new AOL Mail! ------=_NextPart_000_0008_01C856C1.E7E15400 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Bob, I have a friend (not on the list) who tried = them with=20 a 13B on his GlasStar and his opinion was that they did not stand up to = the=20 rotary exhaust pounding and did not reduce the noise sufficient to = justify the=20 cost.  He now flies with a SpinTech
 
Ed
 
 
----- Original Message -----
From:=20 bmears9413@aol.com
Sent: Monday, January 14, 2008 = 3:20=20 PM
Subject: [FlyRotary] Re: Drips? = was=20 [FlyRotary] Re: URL for HushPower

Has anyone tried a supertrap muffler? I ran them back = in my=20 motorcycle racing days and was impressed with ther perfrmance and the = hush=20 factor.
http://www.supertrapp.com/product_sections/detail.= asp?CatID=3D32&ItemID=3D549-3019

Bob=20 Mears
Supermarine Spitfire


-----Original = Message-----
From:=20 Ed Anderson <eanderson@carolina.rr.com&g= t;
To:=20 Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: = Mon, 14=20 Jan 2008 2:05 pm
Subject: [FlyRotary] Re: Drips? was [FlyRotary] = Re: URL=20 for HushPower

Well, Mark, I tried that.  Actually I = tried both SS=20 pot scrubbers as well as SS machining shavings.  They withstand = the heat=20 with no problem, but the shock of the exhaust soon pound them into = small=20 pieces that get blown out of the muffler.  However, I did not = tried=20 stuffing a HushPower II.
 
Ed
----- Original Message -----
From:=20 Mark=20 Steitle
To: Rotary motors in = aircraft=20
Sent: Monday, January 14, = 2008 10:54=20 AM
Subject: [FlyRotary] Re: = Drips? was=20 [FlyRotary] Re: URL for HushPower

Sorry to say, but I agree.  I'm thinking of stuffing my = HP-2 with=20 SS shavings. 
 
Mark

 
On 1/14/08, bmears9413@aol.com <bmears9413@aol.com> = wrote:=20
Im=20 real worried about my noise factor. twelve pipes right in front of = me. no=20 muffler. each 1 1/2" exhaust pipe actually has a 3/4 hole to = exhaust out=20 of. im hoping that will quiet it a bit....but im pretty sure im = full of=20 crap....its gonna be toooooo loud.

Bob=20 Mears


-----Original Message-----
From: Mark Steitle = <msteitle@gmail.com>
To: = Rotary=20 motors in aircraft < flyrotary@lancaironline.net>
Sent:=20 Mon, 14 Jan 2008 9:39 am
Subject: [FlyRotary] Re: Drips? was=20 [FlyRotary] Re: URL for HushPower

The problem with the auger muffler is that everyone said it = sounded=20 like a flying weed-eater.  It was sometimes described as a = flying=20 chainsaw.  Not the most flattering description.  It = wasn't=20 "that" loud, but you could definitely hear me coming from miles = out. =20 Maybe that's a good thing? 
 
I guess we'll soon find out what the HP-2 sounds = like with=20 no packing. 
 
Mark

 
On 1/14/08, bmears9413@aol.com = < bmears9413@aol.com> = wrote:=20
Mark,
I=20 thought your spiral muffler you built was quiet. Did it turn out = to be=20 too loud after you got in the air? Or too much back pressure?=20

Bob Mears


-----Original Message-----
From: = Mark=20 Steitle <msteitle@gmail.com>
To:=20 Rotary motors in aircraft < flyrotary@lancaironline.net>
Sent:=20 Mon, 14 Jan 2008 9:12 am
Subject: [FlyRotary] Re: Drips? was=20 [FlyRotary] Re: URL for HushPower

Ed,
I don't think it was doing this until after shutdown.  = That=20 makes sense as all the heat builds with no airflow over the=20 muffler.  It would probably be wise to put a SS heat shield = between=20 the muffler and the fuselage floor.  (I had a piece of = Zetex=20 installed, but hadn't waited long enough for the RTV to cure and = it=20 started coming off during flight.  I will try a fresh = piece, and=20 wait a little longer this time. 
 
You're probably right on 1 though 4.  I suspect the = packing=20 material to be fiberglass.  I doubt that ceramic would melt = that=20 easily. 
 
Mark
Packing, I don't need no stink'in = packing!

 
On 1/14/08, Ed=20 Anderson <eanderson@carolina.rr.com=20 > wrote:=20
Hi Mark, interesting = development.  I=20 suspect several reasons you may be the only one to=20 notice.
 
1.  It might be that the 3 rotor = keeps the=20 average muffler heat level higher as you have (approx 1/3 more = heat=20 energy with the third pulse during the same time=20 interval).
2.  Your muffler is pretty close = to the=20 exhaust port - less chance to lose heat before the=20 muffler
3.  Your muffler is pointed down = (mine and=20 I suspect most are more/less horizontal) and therefore = provided an=20 easy path for the melted packing to drip down.
4.  What does the packing seem = like? =20 I would have expected glass or ceramic packing - but, a glass = packing=20 would be the more likely of the two to melt.
 
 
  If this is the insulation = packing=20 and it goes, then the shell might get a bit = hotter.
 
 
----- Original Message ----- =
From: Mark=20 Steitle
To: Rotary motors in = aircraft
Sent: Saturday, = January 12,=20 2008 5:58 PM
Subject: [FlyRotary] = Re: URL=20 for HushPower

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

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

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. =20 one is the older model pre 89  and the second is a = later=20 model 91 year.  They both appear to be in working = condition=20 in no nicks on the blades and they spin.  I used = compressed=20 air to spin the compressor wheels to they were really = whizzing=20 along.
 
One came with my 91 turbo block = and the=20 other was 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=20 looking for a "justification" for you/your area/etc.=20 :)

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

Thomas

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

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

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

 
More new features than ever. Check out the new AOL=20 Mail!
 

 
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