X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 973246 for flyrotary@lancaironline.net; Tue, 07 Feb 2006 03:25:47 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.65; envelope-from=bobperk@bellsouth.net Received: from ibm57aec.bellsouth.net ([70.149.150.19]) by imf17aec.mail.bellsouth.net with ESMTP id <20060207082502.DCNG21264.imf17aec.mail.bellsouth.net@ibm57aec.bellsouth.net> for ; Tue, 7 Feb 2006 03:25:02 -0500 Received: from HpPavilion310n ([70.149.150.19]) by ibm57aec.bellsouth.net with ESMTP id <20060207082502.YNBG8735.ibm57aec.bellsouth.net@HpPavilion310n> for ; Tue, 7 Feb 2006 03:25:02 -0500 From: "Bob Perkinson" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Single rotor smooth as silk now Date: Tue, 7 Feb 2006 02:26:57 -0600 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01C62B8D.F8CF8310" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C62B8D.F8CF8310 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit MessageDidn't Mott Taylor develop a clutch system that that used waffled disk and steel shot to transfer torque with out transmitting the pulses to the prop? I think I remember him demonstrating it at Oshkosh back in 81, but I've sleep several places since then.}:>). You might be able to adapt something like that to drive the RD-1. Bob Perkinson Hendersonville, TN. RV9 N658RP Reserved If nothing changes Nothing changes There are two issues to cope with, one is resonances and the other is transferring the torque pulses. The torque pulses are transferred completely in a indefinitly stiff system. We do not want that, because of the internal forces involved. That leaves the resonances created by coupling and element flexing properties. I believe the only way to stay out of the resonances is to keep them low. This is what ROTAX is doing, a 582 has gear rattling around idle. When you watch a ROTAX starting up it is very obvious when the rattling occurs. I have not observed any rattle on my C-Box with the SOOB. Thanks Richard. The 912S that was originally on the plane had a bad rattle problem. If you didn't get it above about 2000 rpm on initial start, you couldn't accelerate out of it. You just had to shut down, and try again. That engine didn't have the "slipper clutch" that came out as a mod for that problem. I'm looking forward to playing with all this eventually, as it will be a neat project. Rusty ------=_NextPart_000_0008_01C62B8D.F8CF8310 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
Didn't Mott=20 Taylor develop a clutch system that that used waffled disk and = steel shot=20 to transfer torque with out transmitting the pulses to the prop?  I = think I=20 remember him demonstrating it at Oshkosh back in 81, but  I've = sleep=20 several places since then.}:>).  You might be able to adapt = something=20 like that to drive the RD-1.

Bob Perkinson
Hendersonville, TN.
RV9 N658RP=20 Reserved
If nothing changes
Nothing = changes
 


 
There are two issues to cope = with, one is=20 resonances and the other is transferring the torque pulses. The torque = pulses=20 are transferred completely in a indefinitly stiff system. We do not = want that,=20 because of the internal forces involved. That leaves the resonances = created by=20 coupling and element flexing properties. I believe the only way to = stay out of=20 the resonances is to keep them low. This is what ROTAX is doing, a 582 = has=20 gear rattling around idle. When you watch a ROTAX starting up it is = very=20 obvious when the rattling occurs. I have not observed any rattle on my = C-Box=20 with the SOOB. 
 
Thanks=20 Richard.  
 
The 912S that was originally on the plane had = a bad=20 rattle problem. If you didn't get it above about 2000 rpm on initial = start,=20 you couldn't accelerate out of it.  You just had to shut down, = and try=20 again.  That engine didn't have the "slipper clutch" that = came out=20 as a mod for that=20 problem.   
 
I'm looking=20 forward to playing with all this eventually, as it will be a neat=20 project. 
 
Rusty
 
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