X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf21aec.mail.bellsouth.net ([205.152.59.69] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2177535 for flyrotary@lancaironline.net; Sat, 14 Jul 2007 13:10:52 -0400 Received-SPF: none receiver=logan.com; client-ip=205.152.59.69; envelope-from=rusty@radrotary.com Received: from ibm63aec.bellsouth.net ([65.6.194.9]) by imf21aec.mail.bellsouth.net with ESMTP id <20070714171014.TBWE23217.imf21aec.mail.bellsouth.net@ibm63aec.bellsouth.net> for ; Sat, 14 Jul 2007 13:10:14 -0400 Received: from rad ([65.6.194.9]) by ibm63aec.bellsouth.net with ESMTP id <20070714171013.XISO2895.ibm63aec.bellsouth.net@rad> for ; Sat, 14 Jul 2007 13:10:13 -0400 From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Single Rotor Run Date: Sat, 14 Jul 2007 12:10:13 -0500 Message-ID: <00b401c7c639$d7f631a0$a301a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00B5_01C7C60F.EF2029A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6822 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 Importance: Normal Thread-Index: AcfGNYMx910oVA8CRIyg3nd7psvDjQAAxyrw In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_00B5_01C7C60F.EF2029A0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable The only way to achieve that is with a much smaller radius for the = location of the coupling elements.=20 =20 I don't know what your coupler looks like, but I would suspect that it = is very close to what is used on the two rotors.=20 If every thing else fails, the Hirth comes with the option for a clutch. = And the price is right.=20 =20 Hi Richard, =20 You'll get no argument from me on your logic. Are you using the stock = Hirth coupler? You posted a picture of it once before, and it looks very = similar to the one that comes on the Autoflight drive. The Autoflight = (Centaflex) coupler might be a bit larger in diameter, but it's hard to tell from = the pics. The bolt diameter is about 4.5" on the one I have. =20 =20 Since 2 strokes are know to run really rough at low rpm, it would make = sense that they would have soft couplers, and it just might make life simpler. = I may end up with a Hirth drive yet :-) =20 Rusty =20 ------=_NextPart_000_00B5_01C7C60F.EF2029A0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
The only way=20 to achieve that is with a much smaller radius for the location of the = coupling=20 elements. 
 
I don't know=20 what your coupler looks like, but I would suspect that it is very close = to what=20 is used on the two rotors. 
If every thing=20 else fails, the Hirth comes with the option for a clutch. And the price = is=20 right. 
 
Hi Richard,
 
You'll get no argument from me on your = logic.  Are=20 you using the stock Hirth coupler?  You posted a picture of it once = before,=20 and it looks very similar to the one that comes on the Autoflight = drive. =20 The Autoflight (Centaflex) coupler might be a bit larger in diameter, = but it's=20 hard to tell from the pics.  The bolt diameter is about 4.5" on the = one I=20 have. 
 
Since 2 strokes are know to run really rough = at low=20 rpm, it would make sense that they would have soft couplers, and it just = might=20 make life simpler.  I may end up with a Hirth drive yet=20 :-)
 
Rusty
 
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