X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from access.aic-fl.com ([204.49.76.2] verified) by logan.com (CommuniGate Pro SMTP 5.1c.5) with ESMTP id 1454289 for flyrotary@lancaironline.net; Tue, 10 Oct 2006 17:24:05 -0400 Received-SPF: none receiver=logan.com; client-ip=204.49.76.2; envelope-from=unicorn@gdsys.net Received: from b9k4u9 (unverified [204.49.76.41]) by access.aic-fl.com (Rockliffe SMTPRA 4.5.6) with SMTP id for ; Tue, 10 Oct 2006 16:21:19 -0500 Message-ID: <002b01c6ecc3$47df9250$294c31cc@b9k4u9> From: "Richard Sohn" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Exhaust Update Date: Tue, 10 Oct 2006 16:24:12 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001C_01C6EC88.8550CBD0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 This is a multi-part message in MIME format. ------=_NextPart_000_001C_01C6EC88.8550CBD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: Joe Hull=20 To: Rotary motors in aircraft=20 Sent: Monday, October 09, 2006 10:10 PM Subject: [FlyRotary] Re: Exhaust Update >Just a heads up - it looks like your new "header flange to pipe" = (picture 5) was welded on the >outside. I think that 'acceptable = practices' state that there should only be a tack weld on the >outside = and the actual structural weld should be on the inside. What does = everyone else say? In >any event be sure to keep an eye on the welds. > >Ken Powell=20 =20 Ken,=20 Yes, I've heard that from PL's list - but haven't seen pictures of any = other flying Rotary that is welded that way. I was going to tell = Aircraft Exhaust to only weld it on the inside but forgot. But I'm not = sure there is agreement about this among the rotary flyers. =20 Joe Hull I can only second the "inside weld/out side tag" principle. I did it = 6years ago on the SOOB and still flying, and also on the one rotor on = the test stand with no problems. I really only copied that from = automotive headers, understanding the rational.=20 If it is welded on the outside only, the pipe will start to erode at = the beginning inside, where it is not physically connected to the flange = because of excessive temperature buildup. Richard Sohn N-2071U ------=_NextPart_000_001C_01C6EC88.8550CBD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 Joe Hull=20
Sent: Monday, October 09, 2006 = 10:10=20 PM
Subject: [FlyRotary] Re: = Exhaust=20 Update

>Just a heads = up - it=20 looks like your new "header flange to pipe" (picture 5) was = welded on the=20 >outside.  I=20 think that 'acceptable practices' state that there should only be a = tack weld=20 on the >outside=20 and the actual structural weld should be on the inside.  What = does=20 everyone else say?   In >any event be sure to keep an = eye on the=20 welds.

>
>Ken Powell =

 

Ken,=20

Yes, I=92ve = heard that=20 from PL=92s list =96 but haven=92t seen pictures of any other flying = Rotary that is=20 welded that way. I was going to tell Aircraft Exhaust to only weld it = on the=20 inside but forgot. But I=92m not sure there is agreement about this = among the=20 rotary flyers.

 

Joe=20 Hull

 

I can = only second the=20 "inside weld/out side tag" principle. I did it 6years ago on the SOOB = and=20 still flying, and also on the one rotor on the test stand with no = problems. I=20 really only copied that from automotive headers, understanding the = rational.=20

If it = is welded on=20 the outside only, the pipe will start to erode at the beginning = inside, where=20 it is not physically connected to the flange because of excessive = temperature=20 buildup.

 

Richard = Sohn
N-2071U

 

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