X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3749983 for flyrotary@lancaironline.net; Wed, 08 Jul 2009 18:51:42 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (sv1-1.per.aanet.com.au [203.24.100.68]) by poplet2.per.eftel.com (Postfix) with ESMTP id E626E1737CD for ; Thu, 9 Jul 2009 06:51:01 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id 51285BEC012 for ; Thu, 9 Jul 2009 06:51:01 +0800 (WST) Message-ID: From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Cog belt PSRU Date: Thu, 9 Jul 2009 08:51:05 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_006B_01CA0072.653B0940" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 090708-0, 07/08/2009), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_006B_01CA0072.653B0940 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Michael, Nice find, I do have some reservations however. There appears to be no = damper, I can't see how the belt is tensioned and I would like to see = both cog wheels supported on both sides. It is nicely made and the = engine mounts and isolators look good. George (down under) Bernie: =20 Here is one for you http://www.altaircoelho.com.br/ac53fotos.html?Submit2=3DFotos+AC+53 http://www.altaircoelho.com.br/ac53.html?Submit=3DVoltar http://www.altaircoelho.com.br/ Produced in Brazil by Altair Coelho a well known aircraft designer in = down there for the VW 4 inline engines as found on the Jetta and Golf = here Michael in Maine (where its raining again) ----- Original Message -----=20 From: Berniehb7448@wmconnect.com=20 This is excellent reading, Bill! Maybe this should have its own = heading, like "Cog Belt PSRUs".=20 I've been collecting pictures and descriptions of cog belt PSRUs = just for my own information, looking at different examples. Plus looking = at other types of PSRUs, this is the way I started to understand that = COG BELTS CANNOT BE USED TO ISOLATE TORTIONAL VIBRATION. One thing that = bothered me - unless most of the anti-vibration couplers were very = cleverly hidden, I did not see any at all, because the input cog pulleys = all looked like they were mounted directly onto the flywheel. How come? = Unless I'm really, REALLY missing something. What say you?=20 Bernie. ------=_NextPart_000_006B_01CA0072.653B0940 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
 Michael,
Nice find, I do have some = reservations however.=20 There appears to be no damper, I can't see how the belt is tensioned = and I=20 would like to see both cog wheels supported on both sides. It is = nicely made=20 and the engine mounts and isolators look good.
George (down under)
Bernie: 
 
Here is one for you
 
http://www.altaircoelho.com.br/ac53fotos.html?Submit2=3DFotos+AC+53
 
http://= www.altaircoelho.com.br/ac53.html?Submit=3DVoltar
 
http://www.altaircoelho.com.br/<= /A>
 
Produced in Brazil by Altair Coelho a = well known=20 aircraft designer in down there for the VW 4 inline engines = as found=20 on the Jetta and Golf here
 
Michael in Maine (where its raining=20 again)
 
 
 
 
----- Original Message -----
From:=20 Berniehb7448@wmconnect.com= =20

This is=20 excellent reading, Bill!  Maybe this should have its own = heading, like=20 "Cog Belt PSRUs".

I've been collecting pictures and = descriptions of=20 cog belt PSRUs just for my own information, looking at different = examples.=20 Plus looking at other types of PSRUs, this is the way I started to=20 understand that COG BELTS CANNOT BE USED TO ISOLATE TORTIONAL = VIBRATION. One=20 thing that bothered me - unless most of the anti-vibration couplers = were=20 very cleverly hidden, I did not see any at all, because the input = cog=20 pulleys all looked like they were mounted directly onto the = flywheel. How=20 come? Unless I'm really, REALLY missing something. What say you?=20
Bernie.
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