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 3883832 for flyrotary@lancaironline.net; Mon, 12 Oct 2009 21:21:14 -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 95698173813 for ; Tue, 13 Oct 2009 09:20:39 +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 C29F0BEC001 for ; Tue, 13 Oct 2009 09:20:35 +0800 (WST) Message-ID: <8F025E171D6648CC9D06A85BE00C04B9@ownerf1fc517b8> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: where's the missing power? Date: Tue, 13 Oct 2009 11:10:03 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0035_01CA4BF5.B64D9950" 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 091012-0, 10/12/2009), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0035_01CA4BF5.B64D9950 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Kelly, I think what your referring to is exhaust augmentation whereby an = exhaust tube runs into another open tube, creating a negative pressure = sucking in air around the front end of the larger open tube. This is = very successful with extracting air from the cowl - however it won't = suppress sound, most likely it make it louder with sound waves escaping = through the front open end. If I understand you correctly. George ( down under) Lynn, Another thought.............What do you think an "Extractor" system = (In my "Delta's" case one on each side of the bottom "V") consisting of large diameter tubes = (5-6" ?) exiting=20 behind the cockpit with 2" tubes down the middle and open to forward = motion and prop blast would do to noise level ??.............=20 -- Kelly Troyer=20 "Dyke Delta"_13B ROTARY Engine=20 "RWS"_RD1C/EC2/EM2=20 "Mistral"_Backplate/Oil Manifold=20 -------------- Original message from Lynn Hanover = : --------------=20 Lynn,=20 I would like to see a drawing and I am sure others of the group = would also !!.............I=20 know this is splitting hairs but I am planning on splitting my = exhaust after the collector to two=20 mufflers (no good reason other than the Dyke Delta bottom skin has a = "Keel" shape (V) and I want to keep the bottom symmetrical with a muffler (recessed = with cooling air) on each=20 side of the "V" ) and I wonder what size you would use from the = 2.75" to branch off to the mufflers ??.........=20 Again Thanks, Kelly Troyer=20 "Dyke Delta"_13B ROTARY Engine=20 "RWS"_RD1C/EC2/EM2=20 "Mistral"_Backplate/Oil Manifold=20 The single pipe would about 5.9 square inches. A 2" tube would be = 3.14 square inches. So I would use 2 inch tubing. Most modern V-8s have = a combiner "X" fitting in the center of the two pipe system. It produces = lower back pressure and a less harsh tone.=20 I will make some drawings. Lynn E Hanover ------=_NextPart_000_0035_01CA4BF5.B64D9950 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable =EF=BB=BF

Kelly,

I think what your referring to is = exhaust=20 augmentation whereby an exhaust tube runs into another open tube, = creating a=20 negative pressure sucking in air around the front end of the larger open = tube.=20 This is very successful with extracting air from the cowl - = however it=20 won't suppress sound, most likely it make it louder with sound waves = escaping=20 through the front open end.

If I understand you = correctly.

George ( down under)

Lynn,

Another thought.............What do you think an = "Extractor"=20 system (In my "Delta's" case

one on each side of the bottom "V") consisting of large=20 diameter tubes (5-6" ?) exiting

behind the cockpit with 2" tubes down the middle and open = to forward=20 motion and prop

blast would do to noise level ??.............

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

--------------=20 Original message from Lynn Hanover <lehanover@gmail.com>:=20 --------------

Lynn,

I would like to see a drawing = and I am=20 sure others of the group would also !!.............I

know this is splitting hairs but I am = planning on=20 splitting my exhaust after the collector to two

mufflers (no good reason other than the Dyke = Delta=20 bottom skin has a "Keel" shape (V)

and I want to keep the bottom symmetrical = with a=20 muffler (recessed with cooling air) on each

side of the "V" ) and I wonder what size you = would=20 use from the 2.75" to branch off to the mufflers=20 ??.........

Again Thanks,

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

The single pipe would about 5.9 square = inches. A 2"=20 tube would be 3.14 square inches. So I would use 2 inch tubing. Most = modern=20 V-8s have a combiner "X" fitting in the center of the two pipe = system. It=20 produces lower back pressure and a less harsh tone.

I will make some drawings.

Lynn E = Hanover

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