X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.4.51.88] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0c3) with ESMTP id 750596 for flyrotary@lancaironline.net; Wed, 05 Oct 2005 12:05:29 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.4.51.88; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 5 Oct 2005 09:04:43 -0700 Message-ID: Received: from 4.174.0.154 by BAY107-DAV16.phx.gbl with DAV; Wed, 05 Oct 2005 16:04:43 +0000 X-Originating-IP: [4.174.0.154] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: counterweights Date: Wed, 5 Oct 2005 12:04:38 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_006A_01C5C9A4.F5CE6190" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Wed, 5 Oct 2005 12:04:38 -0400 X-OriginalArrivalTime: 05 Oct 2005 16:04:43.0547 (UTC) FILETIME=[7FD796B0:01C5C9C6] This is a multi-part message in MIME format. ------=_NextPart_000_006A_01C5C9A4.F5CE6190 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Just to add more confusion : ) , I have measured a few external = counterweights and found very little difference in weight between = generations (series 4 & 5). The problem is that it is the moment arm of = the center of mass (distance of CM from crank axis) that is the main = factor, not the absolute weight. =20 Tracy (still buried)=20 ----- Original Message -----=20 From: David Leonard=20 To: Rotary motors in aircraft=20 Sent: Wednesday, October 05, 2005 1:09 AM Subject: [FlyRotary] Re: counterweights Here is the post from the guy on the RX-7 forum: ______________________________________________ I got myself a nifty digital scale a few weeks back and ever since = I;ve been experimenting and checking out various counterweights and = stuff. Since most of the engine counterweights arent marked, its easy to = get them confused once you take them off the engine they came on. I = usually mark mine, but it'd still be nice to be able to differentiate. = SO, I've been weighing them. Here's what I found. This applies to = automatic rear counterweights only.=20 GSLSE s3 11.5 rotors, ctwt weighs 4.30lb 86-8 s4 10.5 rotors, t2 and NA, ctwt weighs 4.04lb (I havent gotten time to weigh the s5 ctwt I have, so no numbers on = that yet, though it SHOULD be the same as FD) 93-95 s6 9.5lb rotors (FD/turbo) cwtw weighs 4.03lb (not enough of a = difference to distinguish from the s4) I compared the s4 and s6 ctwt and can find no difference between them = at all in weight or dimension. THe s4 was ordered brand new, and the s6 = was removed from a stock original FD core = motor, so I trust = these results. I plan to weigh the s5 ctwt soon and see what my results = are. __________________ REBUILT ENGINES AVAILABLE $1000 and up: www.rotaryresurrection.com = Kevin Landers 93 RX-7 Touring single turbo etc.=20 99 Yukon Denali on 24's =20 --=20 In a later post he went on to confirm that the S5 ctr weights also = weighed 4.04. =20 Hmmmmm.... Dave Leonard Turbo Rotary RV-6 N4VY = http://members.aol.com/_ht_a/rotaryroster/index.html = http://members.aol.com/_ht_a/vp4skydoc/index.html ------=_NextPart_000_006A_01C5C9A4.F5CE6190 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Just to add more confusion : ) , I have measured a few external=20 counterweights and found very little difference in weight between = generations=20 (series 4 & 5). The problem is that it is the moment arm of=20 the center of mass (distance of CM from crank axis) that = is the=20 main factor, not the absolute weight.

Tracy (still buried)

----- Original Message -----

From: David Leonard

To: Rotary motors in = aircraft

Sent: Wednesday, October 05, = 2005 1:09=20 AM

Subject: [FlyRotary] Re:=20 counterweights

Here is the post from the guy on the RX-7 forum:

______________________________________________

I got myself a nifty digital scale a few weeks = back and=20 ever since I;ve been experimenting and checking out various = counterweights and=20 stuff. Since most of the engine counterweights arent marked, its easy = to get=20 them confused once you take them off the engine they came on. I = usually mark=20 mine, but it'd still be nice to be able to differentiate. SO, I've = been=20 weighing them. Here's what I found. This applies to automatic rear=20 counterweights only.

GSLSE s3 11.5 rotors, ctwt weighs = 4.30lb
86-8=20 s4 10.5 rotors, t2 and NA, ctwt weighs 4.04lb
(I havent gotten time = to=20 weigh the s5 ctwt I have, so no numbers on that yet, though it SHOULD = be the=20 same as FD)
93-95 s6 9.5lb rotors (FD/turbo) cwtw weighs 4.03lb = (not enough=20 of a difference to distinguish from the s4)

I compared the s4 = and s6=20 ctwt and can find no difference between them at all in weight or = dimension.=20 THe s4 was ordered brand new, and the s6 was removed from a stock = original FD=20 core motor, so I trust these results. I plan to weigh = the s5 ctwt=20 soon and see what my results are.

__________________
REBUILT = ENGINES=20 AVAILABLE $1000 and up: www.rotaryresurrection.com =

Kevin=20 Landers
93 RX-7 Touring single turbo etc.
99 Yukon Denali on=20 24's
=20

--

In a later post he went on to confirm that the S5 ctr weights = also=20 weighed 4.04.

Hmmmmm....

Dave Leonard
Turbo Rotary RV-6 N4VY
http://memb= ers.aol.com/_ht_a/rotaryroster/index.html
http://members= aol.com/_ht_a/vp4skydoc/index.html=20

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