X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao103.cox.net ([68.230.241.43] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3871793 for flyrotary@lancaironline.net; Thu, 01 Oct 2009 21:14:23 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.43; envelope-from=alventures@cox.net Received: from fed1rmimpo03.cox.net ([70.169.32.75]) by fed1rmmtao103.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20091002011345.TVLD11920.fed1rmmtao103.cox.net@fed1rmimpo03.cox.net> for ; Thu, 1 Oct 2009 21:13:45 -0400 Received: from BigAl ([72.192.133.78]) by fed1rmimpo03.cox.net with bizsmtp id ndDk1c00S1hf1Cg04dDkfY; Thu, 01 Oct 2009 21:13:45 -0400 X-VR-Score: -100.00 X-Authority-Analysis: v=1.0 c=1 a=Ia-xEzejAAAA:8 a=kviXuzpPAAAA:8 a=HZJGGiqLAAAA:8 a=YdlCwlLHAAAA:8 a=Mrpg2QM9AAAA:20 a=mL2HTN9MeU88fW728n0A:9 a=F-9nFWtLNlMkMbL3m6BFdY6VZfkA:4 a=EzXvWhQp4_cA:10 a=4vB-4DCPJfMA:10 a=HeoGohOdMD0A:10 a=nl_73-6FQmUA:10 a=nLYAwS0dQaBqP9Tq:21 a=72i37tUfZHEWvv7A:21 a=IlS0MTB9hsB3IB5vXPQA:9 a=o5n-UtIlZTT3lJVtGSUA:7 a=9PpeXsBoGOCPVirr6Wk3iARXby8A:4 a=8VaXF9ewbptyWPt-:21 a=E5ZcXFhithlPtI5S:21 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: Tangential Manifold/Muffler Date: Thu, 1 Oct 2009 18:13:50 -0800 Message-ID: <2AABCDE0EDD4433F803F10D568636742@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0060_01CA42C2.EDB08E20" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6838 In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Thread-Index: AcpCrQq2twKxCLvKSS2VhgtslFh/AAAVvTsg This is a multi-part message in MIME format. ------=_NextPart_000_0060_01CA42C2.EDB08E20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Mark; =20 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=94 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. =20 I also have a secondary SS muffler of my own design which knocks another = 6 db off the noise. =20 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. =20 Best, Al G =20 -----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 =20 Kelly,=20 =20 You just need to fly at Mach 1 so you stay ahead of the sound. ;-) =20 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. =20 Mark S. On Wed, Sep 30, 2009 at 10:01 PM, Mike Wills wrote: Kelly, =20 If you think the quiet is deafening go fly behind a rotary - now thats deafening! =20 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 =20 Anyone out there ??.....................<:) -- Kelly Troyer=20 "Dyke Delta"_13B ROTARY Engine=20 "RWS"_RD1C/EC2/EM2=20 "Mistral"_Backplate/Oil Manifold=20 =20 -------------- Original message from "Patrick Panzera" : --------------=20 Hey gang! =20 I came across a rare find this weekend. Any serious rotorhead will certainly appreciate this. =20 Bluelines from 1973 of the General Motors Wankel Rotary engine. =20 I just put them up on eBay =20 http://tinyurl.com/GM-Rotary-drawings =20 Pat =20 =20 ------=_NextPart_000_0060_01CA42C2.EDB08E20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Mark;

 

Yes; I have a tangential muffler. = =A0It is light weight, does a nice job of quieting things down, and based on dyno results, has little if any power penalty. =A0It is made of .045” = inconnel; 5 inches in diameter, and has worked great for 150 hours on my 20B. =A0I = 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,

 

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 <rv-4mike@cox.net> wrote:

Kelly,

 

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

 

Mike Wills

RV-4 N144MW

=

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

From: Kelly Troyer

To:<= /font> Rotary motors in aircraft =

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

Subject: [FlyRotary] Quiet is Deafening

 

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

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


 

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

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=

 

 

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