X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao105.cox.net ([68.230.241.41] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2919586 for flyrotary@lancaironline.net; Mon, 12 May 2008 22:47:59 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.41; envelope-from=rv-4mike@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao105.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20080513024720.TTPD7113.fed1rmmtao105.cox.net@fed1rmimpo01.cox.net> for ; Mon, 12 May 2008 22:47:20 -0400 Received: from wills ([68.105.85.56]) by fed1rmimpo01.cox.net with bizsmtp id QqnK1Z0031CvZmk03qnL2B; Mon, 12 May 2008 22:47:20 -0400 Message-ID: <006401c8b4a3$a964bec0$38556944@wills> From: "Mike Wills" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Exhaust Progress Date: Mon, 12 May 2008 19:47:18 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0061_01C8B468.FCBE5670" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0061_01C8B468.FCBE5670 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Doug, Read my post regarding my airplane empty weight from yesterday. My = empty weight is about 75 pounds above Tracy's and I know for sure some = of that weight is in the exhaust. I'd highly recommend stepping up to = 321 and going down in wall thickness to save some weight. Those = incremental increases really add up and using .120 your exhaust system = is going to be HEAVY. As you can tell I'm not real happy about my empty weight. No doubt it = will still fly fine as it's still 30 pounds lighter than my 160HP Lyc = RV-6A. But I'd still like it to be lighter. I didnt think I was building = that heavy. No idea where I will lose 75 pounds but I am going to be = looking over everything with a critical eye. Mike Wills RV-4 N144MW ----- Original Message -----=20 From: DLOMHEIM@aol.com=20 To: Rotary motors in aircraft=20 Sent: Monday, May 12, 2008 6:53 PM Subject: [FlyRotary] Exhaust Progress =20 I have finally cut had the time to cut out the 304 SS (.120 thickness) = I purchased some months ago and am now ready for my welding buddy to = bring his TIG welder over and tack it up. The overall length is about = 22" on the firewall side pipe, but 21.25" on the "front" pipe, so I plan = on cutting the collector about 3/4 inches long on one side to even them = up. Overall the collector will have to shortened up considerably to = achieve the more optimum 24 inch length Lynn has talked about for lower = RPM / HP applications such as mine. =20 Maybe Lynn could chime in here and comment on where on the collector = that 24 inch point should be located for 5500-6000 rpm operations. = Hopefully where the collector first opens up between the two pipes... If that isn't the case it won't be possible to hit the "optimum" = point. I also am planning on putting a ball joint of some type (type = sold by Spruce) at the end of the collector before takes a 90 turn down = followed by another 90 degree turn to direct it down the middle of the = fuselage to the Spintech muffler I received with the engine. Anyway, = slow progress but at least some progress... Doug Lomheim RV-9A, OK City, OK P.S. I didn't have enough hands to really position it all perfectly = on angle but hopefully you get the idea... -------------------------------------------------------------------------= ----- Wondering what's for Dinner Tonight? Get new twists on family = favorites at AOL Food. -------------------------------------------------------------------------= ----- -------------------------------------------------------------------------= ----- -------------------------------------------------------------------------= ----- -------------------------------------------------------------------------= ----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_0061_01C8B468.FCBE5670 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Doug,
 
 Read my post regarding my airplane empty weight from = yesterday.=20 My empty weight is about 75 pounds above Tracy's and I know for sure = some of=20 that weight is in the exhaust. I'd highly recommend stepping up to 321 = and going=20 down in wall thickness to save some weight. Those incremental increases = really=20 add up and using .120 your exhaust system is going to be HEAVY.
 
 As you can tell I'm not real happy about my empty weight. No = doubt it=20 will still fly fine as it's still 30 pounds lighter than my 160HP Lyc = RV-6A. But=20 I'd still like it to be lighter. I didnt think I was building that = heavy. No=20 idea where I will lose 75 pounds but I am going to be looking over = everything=20 with a critical eye.
 
Mike Wills
RV-4 N144MW
----- Original Message -----
From:=20 DLOMHEIM@aol.com=20
Sent: Monday, May 12, 2008 6:53 = PM
Subject: [FlyRotary] Exhaust=20 Progress

 =20
I have finally cut had the time to cut out the 304 SS (.120 = thickness) I=20 purchased some months ago and am now ready for my welding buddy to = bring his=20 TIG welder over and tack it up.  The overall length is about 22" = on=20 the firewall side pipe, but 21.25" on the "front" pipe, so = I plan on=20 cutting the collector about 3/4 inches long on one side to = even them=20 up.  Overall the collector will have to shortened up = considerably to=20 achieve the more optimum 24 inch length Lynn has talked about for = lower=20 RPM / HP applications such as mine.  
 
Maybe Lynn could chime in here and comment on where on the = collector=20 that 24 inch point should be located for 5500-6000 rpm = operations. =20 Hopefully where the collector first opens up between the two = pipes...
 
If that isn't the case it won't be possible to hit the "optimum"=20 point.  I also am planning on putting a ball joint of some = type=20 (type sold by Spruce) at the end of the collector = before takes=20 a 90 turn down followed by another 90 degree turn to direct it = down the=20 middle of the fuselage to the Spintech muffler I received with = the=20 engine.   Anyway, slow progress but at least some = progress...
 
Doug Lomheim
RV-9A, OK City, OK
 
P.S.  I didn't have enough hands to really position it all = perfectly=20 on angle but hopefully you get the idea...
 



Wondering what's for Dinner Tonight? Get new twists on family favorites at AOL = Food.

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