X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-iw0-f173.google.com ([209.85.223.173] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4218430 for flyrotary@lancaironline.net; Mon, 12 Apr 2010 09:20:07 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.223.173; envelope-from=msteitle@gmail.com Received: by iwn3 with SMTP id 3so756233iwn.3 for ; Mon, 12 Apr 2010 06:19:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:received:message-id:subject:from:to:content-type; bh=4QXRDZdVMWRBkXQ0QWtOAeIszOrTxuhHMF8xBOZ6Zw0=; b=arHZf55lNGWvLWCksgnbgvM6VvZPSyPWiuW+UZRC53JbFPW/ntK7tC2k9AvxUeYbKg C9llSUZUNmVct7ebz43a5JOYUAXdlExpDzOUBMuE5RbJQaUGwtfIDNxgt77OjG2aJjOG ehj8ACQ9SLCZ1R00ByNfDd2PU/OddAOQKyzk4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=fmBzq8tCnGmKe2Yv9l+FkCbLijeWSeCKNLnSdnKGC5ndrPpBoEqNiHmvsa2l8wEMl3 4lPZr7PGOaSsiCSZErYukFLLR6qkR8S7WIWGD4OP6J60J4qIvd2wdvk9xyu6pt1kOdpE XKEVKj73lvzxprv7lHWLYcjibdi6+LYfP979Q= MIME-Version: 1.0 Received: by 10.231.183.195 with HTTP; Mon, 12 Apr 2010 06:19:30 -0700 (PDT) In-Reply-To: References: Date: Mon, 12 Apr 2010 08:19:30 -0500 Received: by 10.231.169.145 with SMTP id z17mr1892451iby.83.1271078370468; Mon, 12 Apr 2010 06:19:30 -0700 (PDT) Message-ID: Subject: Re: [FlyRotary] Re: Tangential muffler From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0016e68dec34c0e47f048409fe7b --0016e68dec34c0e47f048409fe7b Content-Type: text/plain; charset=ISO-8859-1 Ernest, Yes, I can inspect it by looking up the tailpipe with a borescope. I can also look in through the three inlets. Initially I tried drilling holes but soon realized that this was futile. That's when I turned to the side grinder. Material is .065 inconel and is supported on both ends. If it starts coming apart I can cut the ends off and try something else. Mark On Mon, Apr 12, 2010 at 8:00 AM, Ernest Christley wrote: > Mark Steitle wrote: > >> Kelly, >> The really nice thing about the slotted tube is that anyone with a side >> grinder and a hammer could build it. I cut the outer tube with a chop saw. >> Used a side grinder & die grinder for shaping the inlets, etc. I purchased >> all of the materials off ebay. The muffler shop expanded some of the misc >> pieces used for the joints. So, this is a project that almost anyone could >> accomplish with basic tools (welding excluded). The difficult part (for me) >> was deciding on the design. Mark >> > Do you have a way to inspect the inner tube, Mark? > > A grinder will leave two fairly severe 90 degree corners on every edge of > the cut slot. Compounding this is the fact that the side grinder cuts a > circle. The end of each slot will be left with a knife edge profile > pointing back toward the slot. This will create some mean stress risers. > The expectation is that this tube is to live in an environment that has to > be the closest thing to hell on Earth we could imagine (extreme heat and > constant sonic blasts). > > I would have suggested drilling 3/16" holes and connecting them with the > grinder. Unless the inside tube is fabricated different than what I > understand, I can't help but to think that it will have a very short life. > Cracks will start in the corners of each slot, and the tube will > disintegrate. Can it be easily pulled apart so that you could run a round > needle file down both sides of all the slots to round them out? > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > --0016e68dec34c0e47f048409fe7b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Ernest,
=A0
Yes, I can inspect it by looking up the tailpipe with a borescope.=A0 = I can also=A0look in through the three inlets.=A0 Initially I=A0tried drill= ing holes but soon realized that this was futile.=A0 That's when I turn= ed to the side grinder.=A0 Material is .065 inconel and is supported on bot= h ends.=A0 If it starts coming apart I can=A0cut the ends off and try somet= hing else.=A0=A0
=A0
Mark=A0

On Mon, Apr 12, 2010 at 8:00 AM, Ernest Christle= y <echristley@= nc.rr.com> wrote:
Mark Steitle wrote:
Kelly,
=A0The really nice thi= ng about the slotted tube is that anyone with a side grinder and a hammer c= ould build it. =A0I cut the outer tube with a chop saw. =A0Used a side grin= der & die grinder for shaping the inlets, etc. =A0I purchased all of th= e materials off ebay. =A0The muffler shop expanded some of the misc pieces = used for the joints. =A0So, this is a project that almost anyone could acco= mplish with basic tools (welding excluded). =A0The difficult part (for me) = was deciding on the design. =A0Mark
Do you have a way to inspect the inner tube, Mark?

A gr= inder will leave two fairly severe 90 degree corners on every edge of the c= ut slot. =A0Compounding this is the fact that the side grinder cuts a circl= e. =A0The end of each slot will be left with a knife edge profile pointing = back toward the slot. =A0This will create some mean stress risers. =A0The e= xpectation is that this tube is to live in an environment that has to be th= e closest thing to hell on Earth we could imagine (extreme heat and constan= t sonic blasts).

I would have suggested drilling 3/16" holes and connecting them wi= th the grinder. =A0Unless the inside tube is fabricated different than what= I understand, I can't help but to think that it will have a very short= life. =A0Cracks will start in the corners of each slot, and the tube will = disintegrate. Can it be easily pulled apart so that you could run a round n= eedle file down both sides of all the slots to round them out?

--
Homepage: =A0http://www.flyrotary.com/
Archive and Un= Sub: =A0 http://mail.lancaironline.net:81/lists/flyrotary/Lis= t.html

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