X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d23.mx.aol.com ([205.188.139.137] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 910175 for flyrotary@lancaironline.net; Mon, 02 Jan 2006 07:19:46 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.139.137; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-d23.mx.aol.com (mail_out_v38_r6.3.) id q.265.3671ea7 (4552) for ; Mon, 2 Jan 2006 07:18:56 -0500 (EST) From: Lehanover@aol.com Message-ID: <265.3671ea7.30ea7430@aol.com> Date: Mon, 2 Jan 2006 07:18:56 EST Subject: Re: [FlyRotary] Re: Single rotor running- Tracy questions To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1136204336" X-Mailer: 9.0 SE for Windows sub 5022 X-Spam-Flag: NO -------------------------------1136204336 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 1/2/2006 1:21:43 AM Eastern Standard Time, WRJJRS@aol.com writes: Very interesting Rusty, I suggest that you Google the BD-5 and vibration study. The article talks about the problems of harmonic vibration and is very interesting and understandable as there are no mathematics (vibration studies are very involved) rather there is a discussion of the results of making the system work. I would suggest that anyone thinking of longer shafts or belts read this article. Bill Jepson _http://www.prime-mover.org/Engines/Torsional/contact1/contact1.html_ (http://www.prime-mover.org/Engines/Torsional/contact1/contact1.html) One quick fix is adding a bit of flywheel mass. The race car can idle right down, RPM wise but with no flywheel, it shakes the trans so hard you hear it above the considerable exhaust note. So, the idle is set at 2,200 RPM. Seems real happy there and makes no trans noise. The missing rotor looked like flywheel mass to the system. So removing it raises the RPM where one of the nodes is peaking. The BD-5 article is a must read for all builders, just to get the hair on the back of your neck standing up. Like chain spank on a go kart. Lighter shoes in the clutch keeps the chain and sprockets out of the system until the RPMs are above the problem speed. Like a higher stall speed converter, or a softer coupling, or more flywheel (effect) mass. A manageable problem. Lynn E. Hanover -------------------------------1136204336 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 1/2/2006 1:21:43 AM Eastern Standard Time,=20 WRJJRS@aol.com writes:

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

Very interesting Rusty,

I suggest that you Google the BD-5 and vibration study. The art= icle=20 talks about the problems of harmonic vibration and is very interesting and= =20 understandable as there are no mathematics (vibration studies are very=20 involved) rather there is a discussion of the results of making the system= =20 work. I would suggest that anyone thinking of longer shafts or belts read=20= this=20 article.

Bill Jepson

http://www.prime-mover.org/Engines/Torsional/contact1/contact1.html

One quick fix is adding a bit of flywheel mass. The race car can idle r= ight=20 down, RPM wise but with no flywheel, it shakes the trans so hard you hear it= =20 above the considerable exhaust note. So, the idle is set at 2,200 RPM. Seems= =20 real happy there and makes no trans noise.

The missing rotor looked like flywheel mass to the system. So removing=20= it=20 raises the RPM where one of the nodes is peaking.

The BD-5 article is a must read for all builders, just to get the hair=20= on=20 the back of your neck standing up.

Like chain spank on a go kart. Lighter shoes in the clutch keeps the ch= ain=20 and sprockets out of the system until the RPMs are above the problem speed.=20= Like=20 a higher stall speed converter, or a softer coupling, or more flywheel (effe= ct)=20 mass.

A manageable problem.

Lynn E. Hanover

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