Return-Path: Received: from ms-smtp-01.southeast.rr.com ([24.93.67.82] verified) by logan.com (CommuniGate Pro SMTP 4.1.4) with ESMTP id 2601864 for flyrotary@lancaironline.net; Wed, 24 Sep 2003 13:32:46 -0400 Received: from o7y6b5 (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-01.southeast.rr.com (8.12.5/8.12.2) with SMTP id h8OHPF0R003670 for ; Wed, 24 Sep 2003 13:25:17 -0400 (EDT) Message-ID: <002001c382c1$78d79840$1702a8c0@WorkGroup> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: DIE the short Answer Date: Wed, 24 Sep 2003 13:29:56 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001D_01C3829F.F18BFC80" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_001D_01C3829F.F18BFC80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageRight on, Rusty! In fact after some research I discovered one = reason why the intake manifold I just replaced (which had tubes inside = tubes ala the slide trombone) did not work well. You could adjust it - = with a hammer {:>). I always thought that extruded tubing was the most = dimensionally precise - that would be like the 6061 (which is what I had = used). It turns out - NOT SO!. Drawn Tubing is the most dimensionally = precise (of any tubing commonly available). It turns out that is = 6063-T382 tubing commonly used in making telescoping antennas, etc. Then it becomes a challenge to come up with an alignment method that = keeps the upper and lower part of the tubes fairly precisedly aligned. = Otherwise, just the slightest bit of "cocking" will jam the tubes. I = had been working on a 4 tube inflight adjustable intake manifold, when = after much work and frustration(there, there's that word again), just = had to admit it was unlikely to ever work (for long) in the under the = cowl environment. Perhaps with a real machine shop instead of one with = a old Sears lathe and chinese drill press, I could have done it (thats = about to change - getting a real metal working mill/lathe), but, I = decided to put that on the junk heap and try something different. =20 In any case, the EDDIE study indicated that for my system that combining = the primary and secondary runners after they exit the block not only = would probably not hurt things, it might help. Well, it certainly = simplified the tube alignment problem and we will see about its affect = (if any) on performance. Ed Anderson ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Wednesday, September 24, 2003 11:48 AM Subject: [FlyRotary] Re: DIE the short Answer We somehow have to keep the lower pressure in the manifold (at idle = for example) from sucking the rubber tubes closed. So the concept is = ..err great, err, but needs some more work on the details{:>) Two words- slide trombone :-) Rusty (I'll just turn up the boost) ------=_NextPart_000_001D_01C3829F.F18BFC80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Right on,  Rusty!  In fact = after some=20 research I discovered one reason why the intake manifold I just replaced = (which=20 had tubes inside tubes ala the slide trombone) did not work well. You = could=20 adjust it - with a hammer {:>).  I always thought that extruded = tubing=20 was the most dimensionally precise - that would be like the 6061 (which = is what=20 I had used).  It turns out - NOT SO!.  Drawn Tubing is the = most=20 dimensionally precise (of any tubing commonly available).  It turns = out=20 that is 6063-T382 tubing commonly used in making telescoping antennas,=20 etc.
 
Then it becomes a challenge to come up = with an=20 alignment method that keeps the upper and lower part of the tubes fairly = precisedly aligned.  Otherwise, just the slightest bit of "cocking" = will=20 jam the tubes.  I had been working on a 4 tube inflight adjustable = intake=20 manifold, when after much work and frustration(there, there's that word = again),=20 just had to admit it was unlikely to ever work (for long) in the under = the cowl=20 environment.  Perhaps with a real machine shop instead of one with =  a=20 old Sears lathe and chinese drill press, I could have done it (thats = about to=20 change - getting a real metal working mill/lathe), but, I decided to put = that on=20 the junk heap and try something different. 
 
In any case, the EDDIE study indicated = that for my=20 system that combining the primary and secondary runners after they exit = the=20 block not only would probably not hurt things, it might help.  = Well, it=20 certainly simplified the tube alignment problem and we will see about = its affect=20 (if any) on performance.
 
Ed Anderson
 
 
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Wednesday, September 24, = 2003 11:48=20 AM
Subject: [FlyRotary] Re: DIE = the short=20 Answer

We somehow have to keep the lower pressure in the = manifold (at=20 idle for
example) from sucking the rubber tubes closed.  So = the=20 concept is ..err great, err, but needs some more  work on the=20 details{:>)

 
Two = words- slide=20 trombone :-)

Rusty (I'll just turn = up the=20 boost)

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