X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail02.syd.optusnet.com.au ([211.29.132.183] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTPS id 2551529 for flyrotary@lancaironline.net; Sun, 02 Dec 2007 01:47:14 -0500 Received-SPF: none receiver=logan.com; client-ip=211.29.132.183; envelope-from=lendich@optusnet.com.au Received: from george (d58-108-72-98.dsl.nsw.optusnet.com.au [58.108.72.98]) by mail02.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id lB26kRio016425 for ; Sun, 2 Dec 2007 17:46:28 +1100 Message-ID: <001b01c834af$129f2580$62486c3a@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Giving up on single rotor Date: Sun, 2 Dec 2007 16:46:29 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0018_01C83502.E3475A10" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0018_01C83502.E3475A10 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageRigh-t-o Rusty! Thanks George ( down under) So what durometer is your gut feeling now that you went this far?=20 Hi George, I don't think you can compare the durometer of one damper to another, = because the physical size is as important as the hardness of the rubber. = The Autoflight drive uses a stock Centaflex coupler that's only = available in 50 and 60 durometer. It's a fairly large diameter, and = thick coupler. 50 was better than 60, but two 50's (effectively 25) in = series was way too soft. Maybe a 40 would be good, but it doesn't = exist. =20 Richard seems to be having better luck with the Hirth drive. Two = strokes are rough at low rpms, so perhaps they already have the right = damper for the job. I also suspect his engine has softer power pulses = at low rpms. It's a 12A for one, and PP for another. PP is great at = high rpms, but not know for good power down low. It's the best theory I = have. =20 Cheers, Rusty =20 -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Free Edition.=20 Version: 7.5.503 / Virus Database: 269.16.11/1161 - Release Date: = 30/11/2007 12:12 PM ------=_NextPart_000_0018_01C83502.E3475A10 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Righ-t-o Rusty!
Thanks
George ( down under)
So what durometer is your gut = feeling now=20 that you went this far? 
 
Hi George,
 
I don't think you can compare the durometer = of one damper=20 to another, because the physical size is as important as the hardness = of the=20 rubber.  The Autoflight drive uses a stock Centaflex coupler = that's only=20 available in 50 and 60 durometer.  It's a fairly large diameter, = and=20 thick coupler.  50 was better than 60, but two 50's (effectively = 25) in=20 series was way too soft.  Maybe a 40 would be good, but it = doesn't=20 exist.  
 
Richard seems to be having better luck = with=20 the Hirth drive.  Two strokes are rough at low rpms, so = perhaps they=20 already have the right damper for the job.  I also suspect = his=20 engine has softer power pulses at low rpms.  It's a 12A for one, = and PP=20 for another.  PP is great at high rpms, but not know for good = power down=20 low.  It's the best theory I=20 have.  
 
Cheers,
Rusty =  

No virus found in this incoming message.
Checked by AVG Free = Edition.
Version: 7.5.503 / Virus Database: 269.16.11/1161 - = Release Date:=20 30/11/2007 12:12 PM
------=_NextPart_000_0018_01C83502.E3475A10--