X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-bw0-f227.google.com ([209.85.218.227] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3877579 for flyrotary@lancaironline.net; Wed, 07 Oct 2009 07:29:16 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.218.227; envelope-from=lehanover@gmail.com Received: by bwz27 with SMTP id 27so3960994bwz.19 for ; Wed, 07 Oct 2009 04:28:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:content-type; bh=ZQ+oSd+tm7WFENWImwNrUPViIhub8kDs7uA7pMYhDU0=; b=b5ENLGBgu7i/s33smwGgy9rWdWNww/c4DFY8zV8ybpYXAyOxDKC4hXK/hPRVifWC9V oo3jRv+2BaLnGxZ/qeo1d1aNM2JgX9YlZE+XdTGzgyYEdr05JAD9M34Ilk3lzYtICseB VGMysSfP77pN6wFN8vKyJBU9ZGwHclAanKvAE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=VaQ2iUiA8XqtOBYnJYoNXmRfCf9nSSnKG1j4FrDYoCiR6yBID74yTP6RwVE+UICBdZ 5ghpLckfJOrHGpvXYRD3WMTqpMiw9rhzpo0TZxRXOPMj/aRP2ANlQjWqxY0sIIvx5QeV DNmcFC/p/+d9B8657yB8oHBE63L3DbWT8yNaY= MIME-Version: 1.0 Received: by 10.204.5.75 with SMTP id 11mr6132573bku.20.1254914917635; Wed, 07 Oct 2009 04:28:37 -0700 (PDT) Date: Wed, 7 Oct 2009 07:28:37 -0400 Message-ID: <1ab24f410910070428y34472c45h1de796836ae089ef@mail.gmail.com> Subject: Balls and Springs From: Lynn Hanover To: flyrotary@lancaironline.net Content-Type: multipart/alternative; boundary=00151743f754e39afd047556a569 --00151743f754e39afd047556a569 Content-Type: text/plain; charset=ISO-8859-1 Lynn, With balancing my single rotor, what would you suggest that I allow ( percentage wise) for oil weight in the rotor - it was suggested to me that I should allow full rotor oil weight. This discussion suggests otherwise. George ( down under) George, The process I saw on the internet came from Down there. A rotor is spun up in the lathe with a plastic shield around the outside. Oil is squirted in until it starts spilling out. A pan is slipped under the rotor and the lathe stopped. (if your lathe has a coolant system that would work as well with less mess) The weights are close enough. Then the rotor is laid on a grill on the pan and allowed to drain. Then weigh the liquid in the pan. I bet the balancing people just have a number on the wall for rotaries that is close to that weight. A balancer could do it backwards by spinning the shaft from a factory built engine, with the counterweights mounted, and then add bobweight until he gets a balance. Then subtract the rotor weight from the bobweight and that difference would be the oil allowance. The big name builders all balance to a gnats butt weight, but I just get the rotor weights the same. Never a problem. The single pulse per revolution will be so big that a small balance error will go unoticed. But, its no sin to start out with the balance correct. I have thought about singles and decided that as big a diameter flywheel that you can fit but weighted only at the outer edge. Like 4 sets of starter rings tiged to a flex plate. Even Mazda builds with pieces two weight ranges apart. They have stamped the weights on rotors, and have used colored paint dots. Of course the paint dots are gone when we see a used rotor. Richard Sohn can tell you. He seems to be doing well with his. Lynn E. Hanover --00151743f754e39afd047556a569 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
=A0Lynn,
With balancing my single rotor, what would = you suggest that I allow ( percentage wise) for oil weight in the rotor - i= t was suggested to me that I should allow full rotor oil weight.
This discussion suggests otherwise.
George ( down under)
=A0
George,
=A0
The process I= saw on the internet came from Down there. A rotor is spun up in the lathe = with a plastic shield around the outside. Oil is squirted in until it start= s spilling out. A pan is slipped under the rotor and the lathe stopped. (if= your lathe has a coolant system that would work as well with less mess) Th= e weights are close enough. Then the rotor is laid on a grill on the pan an= d allowed to drain. Then weigh the liquid in the pan. I bet the balancing p= eople just have a number on the wall for rotaries that is close to that wei= ght. A balancer could do it backwards by spinning the shaft from a factory = built engine, with the counterweights mounted, and then add bobweight until= he gets a balance. Then subtract the rotor weight from the bobweight and t= hat difference would be the oil allowance.
=A0
The big name = builders all balance to a gnats butt weight, but I just get the rotor weigh= ts the same. Never a problem. The single pulse per revolution will be so bi= g that a small balance error will go unoticed. But, its no sin to start out= with the balance correct. I have thought about singles and decided that as= big a diameter flywheel that you can fit but weighted only at the outer ed= ge. Like 4 sets of starter rings tiged to a flex plate. Even Mazda builds w= ith pieces two weight ranges apart. They have stamped the weights on rotors= , and have used colored paint dots. Of course the paint dots are gone when = we see a used rotor.
=A0
Richard Sohn = can tell you. He seems to be doing well with his.
=A0
Lynn E. Hanov= er
=A0
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