X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-m06.mx.aol.com ([64.12.138.200] verified) by logan.com (CommuniGate Pro SMTP 5.2.15) with ESMTP id 3760248 for flyrotary@lancaironline.net; Wed, 15 Jul 2009 13:10:11 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.200; envelope-from=WRJJRS@aol.com Received: from imo-ma01.mx.aol.com (imo-ma01.mx.aol.com [64.12.78.136]) by imr-m06.mx.aol.com (v107.10) with ESMTP id RELAYIN1-24a5e0d29389; Wed, 15 Jul 2009 13:08:57 -0400 Received: from WRJJRS@aol.com by imo-ma01.mx.aol.com (mail_out_v40_r1.5.) id q.cb6.533ea6e3 (37541) for ; Wed, 15 Jul 2009 13:09:25 -0400 (EDT) Received: from smtprly-db02.mx.aol.com (smtprly-db02.mx.aol.com [205.188.249.153]) by cia-mb02.mx.aol.com (v124.15) with ESMTP id MAILCIAMB022-5c354a5e0d44223; Wed, 15 Jul 2009 13:09:25 -0400 Received: from WEBMAIL-DY16 (webmail-dy16.sim.aol.com [205.188.108.141]) by smtprly-db02.mx.aol.com (v124.15) with ESMTP id MAILSMTPRLYDB023-5c354a5e0d44223; Wed, 15 Jul 2009 13:09:24 -0400 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Intake velocity stack lengths Date: Wed, 15 Jul 2009 13:09:24 -0400 X-AOL-IP: 64.12.78.136 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: wrjjrs@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CBD386233C6CBE_11E0_493_WEBMAIL-DY16.sysops.aol.com" X-Mailer: AOL Webmail 43792-STANDARD Received: from 66.253.96.221 by WEBMAIL-DY16.sysops.aol.com (205.188.108.141) with HTTP (WebMailUI); Wed, 15 Jul 2009 13:09:24 -0400 Message-Id: <8CBD3862307F99C-11E0-236@WEBMAIL-DY16.sysops.aol.com> X-Spam-Flag:NO ----------MB_8CBD386233C6CBE_11E0_493_WEBMAIL-DY16.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Ben, There is no reason not to make intake tubes of carbon fiber. The variable= length stacks on Mazda's 4 rotor Le Mans engine used composite stacks. Be= sure you select a high temp resin. The inlet bell is a well defined techn= ology the best results are achieved using a radius approximately 1/4 of th= e tube diameter. Improvements are measureable running up to a full 180=C2= =B0 turn on the intake bell. The small radius at the end of the tube actua= lly turns back in the opposite direction. Tapering the tube along it's len= gth isn't really needed. You could only tell if it helped on a flow bench.= =C2=A0The overall length makes a BIG difference. The length determines the= RPM that the tube will provide the best flow. Generally the longer the tu= be the lower RPM the engine will make peak power. The shortest length sugg= ested on a peripheral port engine is about 14 inches. (That will tune the= inlet for around 9000 RPM +=C2=A0 for peak power) The longest I have seen= used around 22-24 inches. with best power around 7000 RPM. the longer sta= cks are better for aircraft RPMs. Bill Jepson -----Original Message----- From: Ben Schneider To: Rotary motors in aircraft Sent: Tue, Jul 14, 2009 6:33 pm Subject: [FlyRotary] Intake velocity stack lengths ellows, I have been thinking up this crazy idea of trying to make intake runner= tubes ut of carbon fiber. My question is regarding length of the velocity stack.= Does he length make a difference? Could a ve locity stack be more or less the entire ength of the tube? Meaning, if I have a 12" intake tube, could the entire= ength of the tube be a gradual taper to the diameter of the block opening?= ould that mess with the speed the air is traveling in the tube? Aerodynami= cs is ot something I have a very good handle on, and am hoping someone out there= in ly Rotary land can shed some light. Toughts??? BTW, Any reasons why carbon fiber should not be used for intake tubes? Ma= y make he velocity tubes a mute point. Thanks for any thoughts. Ben Schneider P.S. Any Fly Rotary fellows going to OSH??? Perhaps a lunch one day or omething. - omepage: http://www.flyrotary.com/ rchive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.= html ----------MB_8CBD386233C6CBE_11E0_493_WEBMAIL-DY16.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8" Ben,
There is no reason not to make intake tubes of carbon fiber. The variable= length stacks on Mazda's 4 rotor Le Mans engine used composite stacks. Be= sure you select a high temp resin. The inlet bell is a well defined techn= ology the best results are achieved using a radius approximately 1/4 of th= e tube diameter. Improvements are measureable running up to a full 180=C2= =B0 turn on the intake bell. The small radius at the end of the tube actua= lly turns back in the opposite direction. Tapering the tube along it's len= gth isn't really needed. You could only tell if it helped on a flow bench.=
 The overall length makes a BIG difference. The length determines the= RPM that the tube will provide the best flow. Generally the longer the tu= be the lower RPM the engine will make peak power. The shortest length sugg= ested on a peripheral port engine is about 14 inches. (That will tune the= inlet for around 9000 RPM +  for peak power) The longest I have seen= used around 22-24 inches. with best power around 7000 RPM. the longer sta= cks are better for aircraft RPMs.
Bill Jepson


-----Original Message-----
From: Ben Schneider <plumberben@yahoo.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, Jul 14, 2009 6:33 pm
Subject: [FlyRotary] Intake velocity stack lengths


Fellows,

  I have been thinking up this crazy idea of trying to make intake runner=
 tubes 
out of carbon fiber. My question is regarding length of the velocity stack=
. Does 
the length make a difference? Could a velocity stack be more or less the=
 entire 
length of the tube? Meaning, if I have a 12" intake tube, could the entire=
 
length of the tube be a gradual taper to the diameter of the block opening=
? 
Would that mess with the speed the air is traveling in the tube? Aerodynam=
ics is 
not something I have a very good handle on, and am hoping someone out ther=
e in 
Fly Rotary land can shed some light.

Toughts???

BTW,  Any reasons why carbon fiber should not be used for intake tubes? Ma=
y make 
the velocity tubes a mute point.

Thanks for any thoughts.

Ben Schneider

P.S. Any Fly Rotary fellows going to OSH??? Perhaps a lunch one day or 
something.




--
Homepage:  http://ww=
w.flyrotary.com/
Archive and UnSub:   http://mail.lancaironline.net:81/lists/f=
lyrotary/List.html
----------MB_8CBD386233C6CBE_11E0_493_WEBMAIL-DY16.sysops.aol.com--