X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3872598 for flyrotary@lancaironline.net; Fri, 02 Oct 2009 16:28:31 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (sv1-1.per.aanet.com.au [203.24.100.68]) by poplet2.per.eftel.com (Postfix) with ESMTP id 367D21737FE for ; Sat, 3 Oct 2009 04:27:53 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id 54ADABEC007 for ; Sat, 3 Oct 2009 04:27:53 +0800 (WST) Message-ID: <7DB469B3B4FA4A498D2DE05E08C48B0C@ownerf1fc517b8> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Tangential Manifold/Muffler Date: Sat, 3 Oct 2009 06:27:56 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003E_01CA43F2.A4EC0BC0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 091001-0, 10/01/2009), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_003E_01CA43F2.A4EC0BC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Al it seems to me that a lot of people are having success with using a = duel muffler system/ or secondary muffler. George ( down under) Mark; Yes; I have a tangential muffler. It is light weight, does a nice job = of quieting things down, and based on dyno results, has little if any = power penalty. It is made of .045" inconnel; 5 inches in diameter, and = has worked great for 150 hours on my 20B. I have internal vanes on the = inside opposite the ports at 45 degree angle to help break up the = pulses, and help direct the exhaust toward the exit at the aft end, = which is conical down to a 2 =BE exit pipe. I also have a secondary SS muffler of my own design which knocks = another 6 db off the noise. I think one advantage of the tangential muffler approach is the = expansion of the gases close to the port, and although not computable = due to other variables, probably immediately drops the temp somewhat in = accordance with Charles Law. Best, Al G -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] = On Behalf Of Mark Steitle Sent: Thursday, October 01, 2009 7:36 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Quiet is Deafening Kelly,=20 You just need to fly at Mach 1 so you stay ahead of the sound. ;-) Can anyone report on the effectiveness of the tangential muffler in = actual real world situations? (As I recall Al G. is running a = tangential muffler on his Velocity.) I ask because I'm in the process = of building one for my Lancair with the hopes that it will work better = than the DNA muffler that I'm currently running. I think it will work = better at reducing the noise level in the cabin, but at what cost to = power? Hopefully, this will save me the cost of a new Zulu ANR headset. = Comments appreciated. Mark S. On Wed, Sep 30, 2009 at 10:01 PM, Mike Wills wrote: Kelly, If you think the quiet is deafening go fly behind a rotary - now = thats deafening! Mike Wills RV-4 N144MW ----- Original Message -----=20 From: Kelly Troyer=20 To: Rotary motors in aircraft=20 Sent: Wednesday, September 30, 2009 7:15 AM Subject: [FlyRotary] Quiet is Deafening Anyone out there ??.....................<:) -- Kelly Troyer=20 "Dyke Delta"_13B ROTARY Engine=20 "RWS"_RD1C/EC2/EM2=20 "Mistral"_Backplate/Oil Manifold=20 -------------- Original message from "Patrick Panzera" = : --------------=20 Hey gang! I came across a rare find this weekend. Any serious rotorhead will certainly appreciate this. Bluelines from 1973 of the General Motors Wankel Rotary engine. I just put them up on eBay http://tinyurl.com/GM-Rotary-drawings Pat ------=_NextPart_000_003E_01CA43F2.A4EC0BC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 Al it seems to me that a lot of = people are=20 having success with using a duel muffler system/ or secondary=20 muffler.
George ( down under)

Mark;

 

Yes; I = have a=20 tangential muffler.  It is light weight, does a nice job of = quieting=20 things down, and based on dyno results, has little if any power = penalty.=20  It is made of .045=94 inconnel; 5 inches in diameter, and has = worked great=20 for 150 hours on my 20B.  I have internal vanes on the inside = opposite=20 the ports at 45 degree angle to help break up the pulses, and help = direct the=20 exhaust toward the exit at the aft end, which is conical down to a 2 = =BE exit=20 pipe.

 

I also = have a=20 secondary SS muffler of my own design which knocks another 6 db off = the=20 noise.

 

I think = one=20 advantage of the tangential muffler approach is the expansion of the = gases=20 close to the port, and although not computable due to other variables, = probably immediately drops the temp somewhat in accordance with = Charles=20 Law.

 

Best,

Al=20 G

 

-----Original=20 Message-----
From: = Rotary=20 motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark = Steitle
Sent: Thursday, October=20 01, 2009 7:36=20 AM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: Quiet = is=20 Deafening

 

Kelly, =

 

You just need to fly at Mach = 1 so you=20 stay ahead of the sound.  ;-)

 

Can anyone report on the = effectiveness of=20 the tangential muffler in actual real world situations?  (As I = recall Al=20 G. is running a tangential muffler on his Velocity.)  I ask = because I'm=20 in the process of building one for my Lancair with the hopes that it = will work=20 better than the DNA muffler that I'm currently running.  I think = it will=20 work better at reducing the noise level in the cabin, but at what cost = to=20 power?  Hopefully, this will save me the cost of a new Zulu ANR=20 headset.  Comments appreciated.

 

Mark = S.

On Wed, Sep 30, = 2009 at=20 10:01 PM, Mike Wills <rv-4mike@cox.net> wrote:

Kelly,

 

 If you think the = quiet is=20 deafening go fly behind a rotary - now thats=20 deafening!

 

Mike=20 Wills

RV-4=20 N144MW

----- Original Message = -----=20

From: Kelly=20 Troyer

To: Rotary motors in aircraft =

Sent:=20 Wednesday, September = 30,=20 2009 7:15=20 AM

Subject:=20 [FlyRotary] Quiet is Deafening

 

Anyone out there=20 ??.....................<:)

--
Kelly=20 Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2=20
"Mistral"_Backplate/Oil Manifold =


 

--------------=20 Original message from "Patrick Panzera" <panzera@experimental-aviation.com>: = --------------=20

Hey=20 gang!

 

I came = across a=20 rare find this weekend.

Any = serious=20 rotorhead will certainly appreciate this.

 

Bluelines from=20 1973 of the General Motors Wankel Rotary engine.

 

I just = put them=20 up on eBay

 

http://tinyurl.com/GM-Rotary-drawings

 

Pat

 

 

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