X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 951270 for flyrotary@lancaironline.net; Fri, 20 May 2005 15:12:34 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-065-188-083-049.carolina.res.rr.com [65.188.83.49]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j4KJBj0W005156 for ; Fri, 20 May 2005 15:11:46 -0400 (EDT) Message-ID: <001b01c55d6f$c8c5dad0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Sized 13b Date: Fri, 20 May 2005 15:11:53 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit 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-Virus-Scanned: Symantec AntiVirus Scan Engine ----- Original Message ----- From: "Ernest Christley" To: "Rotary motors in aircraft" Sent: Friday, May 20, 2005 2:13 PM Subject: [FlyRotary] Re: Sized 13b > Ed Anderson wrote: > >> Plugs Up itself was not the problem, inadequate understanding or >> attention to the details of lubrication subsystem was the problem. Dave >> now uses one of powersports spur gear PSRUs, the one that weights 65 lbs >> and cost $6500. He apparently went through several Ross drives and >> having gone through one myself I can understand - although not agree - >> with his views concerning the planetary drive. Simply a less than >> adequate design as embodied in the Ross drive. Tracy's drive is a >> different breed of cat altogether. >> > > > Goes back to something you said last Saturday. You said it off-handedly, > but it really carries a lot of weight and import. I can't quote it > exactly, so I'll paraphrase: > > If you're going to copy a system, you have to copy it exactly. Any > changes makes it a different system. Then you have to go back to the > basics and actually understand how the system works. > > Boy! good memory, Ernest. Yes, I guess if there is anything that I feel somewhat strongly about is folks who "copy" someone else's system - but, don't really copy it and then are surprised because it did not work (or work well). Unless you copy it exactly - you have not copied it, you have a different system and sometimes one seemingly "small" change can make a world of difference. Or if your operating environment is different then two identical systems may not function similarly. That is one hunk of a PSRU you are working on Ernest - have you calculated how it would affect your W&B? Ed A