X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-da04.mx.aol.com ([205.188.105.146] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTP id 5072070 for flyrotary@lancaironline.net; Tue, 02 Aug 2011 19:48:29 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.105.146; envelope-from=wrjjrs@aol.com Received: from mtaout-da01.r1000.mx.aol.com (mtaout-da01.r1000.mx.aol.com [172.29.51.129]) by imr-da04.mx.aol.com (8.14.1/8.14.1) with ESMTP id p72NllNa005091 for ; Tue, 2 Aug 2011 19:47:47 -0400 Received: from [10.241.225.123] (113.sub-174-253-233.myvzw.com [174.253.233.113]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (No client certificate requested) by mtaout-da01.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPSA id 859BCE0000B3 for ; Tue, 2 Aug 2011 19:47:46 -0400 (EDT) Message-ID: From: "wrjjrs@aol.com" To: "Rotary motors in aircraft" Date: Tue, 2 Aug 2011 16:48:01 -0700 X-Mailer: Motorola android mail 1.0 MIME-Version: 1.0 Subject: Re: [FlyRotary] Re: Flywheel Machine Work X-Priority: 3 References: In-Reply-To: Content-Type: multipart/alternative; boundary="Motorola-A-Mail-7snura1g_FX_XoH-" x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:433894880:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d33814e388ca259d5 X-AOL-IP: 174.253.233.113 --Motorola-A-Mail-7snura1g_FX_XoH- Content-Type: text/plain; Format="Flowed"; DelSp="Yes"; charset="US-ASCII" Content-Transfer-Encoding: 7bit Dale, You are correct about rotating assembly. All high speed rotating parts need to be balanced. Bill Jepson Connected by DROID on Verizon Wireless -----Original message----- From: Dale_R To: Rotary motors in aircraft Sent: Tue, Aug 2, 2011 20:45:21 GMT+00:00 Subject: [FlyRotary] Re: Flywheel Machine Work Bill, Dunno how that one slipped past me; I could blame my 30 year old R-S calculator, but ultimately, I'm the responsible party -- I should have run the numbers twice. And it isn't just a misplaced decimal, either; although would have been close. But that just shows how much ~more~ important it is that the flywheel balance be done correctly. Best regards, Dale_R On 8/2/2011 1:27 PM, wrjjrs@aol.com wrote: > Dale, > I think you got a term wrong there. I get 807.34 rpm @ 60 > mph. 25" x 3.14=78.53in > 78.53/12=6.54ft. 60mph=1mile per minute. 5280'/6.545=807.34 > RPM > Bill Jepson > > /Connected by DROID on Verizon Wireless/ > > > -----Original message----- > > *From: *Dale_R * > To: *Rotary motors in aircraft * > Sent: *Tue, Aug 2, 2011 18:02:27 GMT+00:00* > Subject: *[FlyRotary] Re: Flywheel Machine Work > > On 8/2/2011 5:05 AM, David Leonard wrote: > > ... I am starting to think that the whole science of balancing is > > just a gimmick. Despite the old balance hole being mostly drilled > > away, the new balance holes are on the opposite side of the > flywheel. !?? > > > > Dave, > > Balancing is a procedure that falls right on the edge between > science and black art. At high RPMs, changes "out of plane" can > become > critical. > > As an example, when I started balancing wheels all we had were > bubble (sta --Motorola-A-Mail-7snura1g_FX_XoH- Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: base64 PGh0bWw+PGhlYWQ+PHN0eWxlIHR5cGU9InRleHQvY3NzIj5ib2R5IHt3b3JkLXdyYXA6IGJyZWFr LXdvcmQ7IGJhY2tncm91bmQtY29sb3I6I2ZmZmZmZjt9PC9zdHlsZT48L2hlYWQ+PGJvZHk+PGRp diBzdHlsZT0iZm9udC1mYW1pbHk6IHNhbnMtc2VyaWY7IGZvbnQtc2l6ZTogMTZweCI+RGFsZSwg PGJyPllvdSBhcmUgY29ycmVjdCBhYm91dCByb3RhdGluZyBhc3NlbWJseS4gQWxsIGhpZ2ggc3Bl ZWQgcm90YXRpbmcgcGFydHMgbmVlZCB0byBiZSBiYWxhbmNlZC48YnI+QmlsbCBKZXBzb24gPGJy Pjxicj48Zm9udCBjb2xvcj0iIzMzMzMzMyI+PGk+PHNwYW4gc3R5bGU9ImZvbnQtc2l6ZTogMTRw eCI+PGZvbnQgZmFjZT0ic2Fucy1zZXJpZiI+Q29ubmVjdGVkIGJ5IERST0lEIG9uIFZlcml6b24g V2lyZWxlc3M8L2ZvbnQ+PC9zcGFuPjwvaT48L2ZvbnQ+PC9kaXY+PGJyPjxicj4tLS0tLU9yaWdp bmFsIG1lc3NhZ2UtLS0tLTxicj48YmxvY2txdW90ZSBzdHlsZT0iOyBib3JkZXItbGVmdDogMnB4 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