X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m25.mx.aol.com ([64.12.137.6] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1317850 for flyrotary@lancaironline.net; Wed, 26 Jul 2006 23:51:52 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.6; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m25.mx.aol.com (mail_out_v38_r7.5.) id q.55e.3a821e2 (14457) for ; Wed, 26 Jul 2006 23:51:03 -0400 (EDT) From: WRJJRS@aol.com Message-ID: <55e.3a821e2.31f99227@aol.com> Date: Wed, 26 Jul 2006 23:51:03 EDT Subject: Re: [FlyRotary] Re: Inconel To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1153972263" X-Mailer: 9.0 SE for Windows sub 5027 X-Spam-Flag: NO -------------------------------1153972263 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 7/26/2006 4:59:37 PM Pacific Standard Time, alwick@juno.com writes: I just don't know a safe way to do the strobe thing, unless you removed prop. Ideally you would want to use it under load and high rpm. Maybe you could tape it in place, turn on video, then fire up engine. Just would need to tweak strobe frequency to show exhaust movement. I volunteer at science museum physics lab. It is unreal to see vibration with strobe. I use it on water filled glasses. Also on "Chinese dancing water bowl", where you rub bowl handle with hands and it severely bends and splashes water due to harmonic vibration. Only a couple weeks ago, I read the specs for this slip fit. I can't find source. It was some EAA book I think. I have no leakage with a 2-3" long slip fit. You want the smaller diam tube to be up stream, so a leak would have to reverse flow direction. Does that make sense? The attached pic does not show the slip fit. Slip is directly behind the pipe coming out of the muffler, so you can't see it. But basically that large diam muffler section can rotate. Only the fastener attached to psru stops it from rotation. Slip fit changes exhaust freq response, eliminates axial forces. Unsure if it will help your situation. Something to consider. Those exhaust ball joints accomplish the same. Appreciate the positive feedback. Very rare. -al wick Al, The strobe idea is a good and useable idea and deserves positive feedback. Any idea that can be implemented by those not in possession of a physics lab are great ideas. Your comments about pressure waves in the exhaust goes double for the rotary since the exhaust temperatures are high enough to soften many materials. You could also positively comment about why many mufflers and exhaust components have formed ends. Even what we often consider "conventional" muffler cans usually have a formed end. The end usually is inverted, or stuffed into the can to allow a seam weld rather than a butt weld. The components usually have to surviuve a few contrived backfires before the companies would allow them into the field. Bill Jepson -------------------------------1153972263 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 7/26/2006 4:59:37 PM Pacific Standard Time,=20 alwick@juno.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>

I just don't know a safe way to do the strobe thing, unless you remov= ed=20 prop. Ideally you would want to use it under load and high rpm. Maybe you=20 could tape it in place, turn on video, then fire up engine. Just would nee= d to=20 tweak strobe frequency to show exhaust movement.

I volunteer at science museum physics lab. It is unreal to see vibrat= ion=20 with strobe. I use it on water filled glasses. Also on "Chinese dancing wa= ter=20 bowl", where you rub bowl handle with hands and it severely bends and spla= shes=20 water due to harmonic vibration.

Only a couple weeks ago, I read the specs for this slip fit. I can't=20= find=20 source. It was some EAA book I think. I have no leakage with a 2= -3"=20 long slip fit. You want the smaller diam tube to be up stream, so a leak w= ould=20 have to reverse flow direction. Does that make sense?

The attached pic does not show the slip=20 fit. Slip is directly behind the pipe coming out of the=20 muffler, so you can't see it. But basically that large diam muffler sectio= n=20 can rotate. Only the fastener attached to psru stops it from rotation.

Slip fit changes exhaust freq response, eliminates axial forces. Unsu= re=20 if it will help your situation. Something to consider. Those exhaust ball=20 joints accomplish the same.

Appreciate the positive feedback. Very rare.

-al wick

Al,

The strobe idea is a good and useable idea and deserves positive feedba= ck.=20 Any idea that can be implemented by those not in possession of a physics lab= are=20 great ideas. Your comments about pressure waves in the exhaust goes double f= or=20 the rotary since the exhaust temperatures are high enough to soften man= y=20 materials. You could also positively comment about why many mufflers and exh= aust=20 components have formed ends. Even what we often consider "conventional" muff= ler=20 cans usually have a formed end. The end usually is inverted, or stuffed into= the=20 can to allow a seam weld rather than a butt weld. The components usually hav= e to=20 surviuve a few contrived backfires before the companies would allow them int= o=20 the field.

Bill Jepson

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