X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wproxy.gmail.com ([64.233.184.201] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 972058 for flyrotary@lancaironline.net; Mon, 06 Feb 2006 10:03:25 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.233.184.201; envelope-from=russell.duffy@gmail.com Received: by wproxy.gmail.com with SMTP id 37so1215427wra for ; Mon, 06 Feb 2006 07:02:40 -0800 (PST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:from:to:subject:date:message-id:mime-version:content-type:x-priority:x-msmail-priority:x-mailer:importance:x-mimeole:in-reply-to; b=ROywPg2eXZioXYt4sgGTLynbK/9fPX/jTebSVSyx77BroeyAyeQsD3Z2FBtJVffIf0qAyFHOEg7AjBP6XqlDzA+I5sz+ZDke2/8KuQtTn048udQB3H84RPqpomRm/+Zowvr3k1kRQ14WiHMXNTGR8rnZT+i8uJA4aGm7Hkl2qO0= Received: by 10.54.151.15 with SMTP id y15mr4482321wrd; Mon, 06 Feb 2006 07:02:40 -0800 (PST) Return-Path: Received: from rd ( [65.6.194.9]) by mx.gmail.com with ESMTP id 15sm168297wrl.2006.02.06.07.02.39; Mon, 06 Feb 2006 07:02:39 -0800 (PST) From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Single rotor smooth as silk now Date: Mon, 6 Feb 2006 09:02:40 -0600 Message-ID: <00a401c62b2e$60648c10$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A5_01C62AFC.15CA1C10" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2670 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_00A5_01C62AFC.15CA1C10 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable let me throw something in here on the dampener. Tracy's dampener is not built to take up a lot of torque vibration at low rpm. What we need on = the single is having the soft elements closer to the center line of the = e-shaft, allowing more movement in them, eg. having a softer coupling =3D lower resonant frequency, and at the same time utilizing some of the dampening characteristics inherrent in the rubber. The closest to that requrement = I could come up with, is the do-nut shaped coupler used on Rotax and Hirth engines. They are also available in different Shore values. I have not = found a US source yet. =20 =20 Hi Richard, =20 Excellent comments. Thanks. This fits perfectly with the mental image = I have of the problem. I can't wait to hear more about how your Hirth = drive behaves. If it works well, then it's a slam dunk, since it's cheap, = light, and available. =20 =20 There are some interesting possibilities on this page as well- http://www.airtrikes.net/engines.shtml I know someone who has one of = his gear drives on a geo engine, but emails to the guy who makes the drive = have gone unanswered. =20 =20 I'll keep an eye out for something to appear over the rest of this year, = and get more serious about finding or making something if that doesn't = happen. I haven't completely ruled out ducted fan either. =20 =20 Thanks, Rusty =20 =20 =20 ------=_NextPart_000_00A5_01C62AFC.15CA1C10 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
let=20 me throw something in here on the dampener. Tracy's dampener is not = built=20 to take up a lot of torque vibration at low rpm. What we need on the = single is=20 having the soft elements closer to the center line of the e-shaft, = allowing more=20 movement in them, eg. having a softer coupling =3D lower resonant = frequency, and=20 at the same time utilizing some of the dampening characteristics = inherrent in=20 the rubber. The closest to that requrement I could come up with, is the = do-nut=20 shaped coupler used on Rotax and Hirth engines. They are also available = in=20 different Shore values. I have not found a US source yet.  
 
Hi=20 Richard,
 
Excellent = comments. =20 Thanks.  This fits perfectly with the mental image I have of = the=20 problem.   I can't wait to hear more about how your Hirth = drive=20 behaves.  If it works well, then it's a slam dunk, since it's = cheap, light,=20 and available. 
 
There are some interesting = possibilities=20 on this page as well-  http://www.airtrikes.net/= engines.shtml =20 I know someone who has one of his gear drives on a geo engine, but = emails to the=20 guy who makes the drive have gone unanswered. =20
 
I'll keep an eye out = for=20 something to appear over the rest of this year, and get more = serious=20 about finding or making something if that doesn't happen.  I = haven't=20 completely ruled out ducted fan either.  =
 
Thanks,
Rusty=20  
 
 
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