Return-Path: Received: from rtp-iport-1.cisco.com ([64.102.122.148] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 752953 for flyrotary@lancaironline.net; Mon, 21 Feb 2005 13:09:57 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.102.122.148; envelope-from=echristl@cisco.com Received: from rtp-core-2.cisco.com (64.102.124.13) by rtp-iport-1.cisco.com with ESMTP; 21 Feb 2005 13:22:40 -0500 X-BrightmailFiltered: true X-Brightmail-Tracker: AAAAAA== X-IronPort-AV: i="3.90,104,1107752400"; d="scan'208"; a="37805700:sNHT19213478" Received: from [172.18.179.151] (echristl-linux.cisco.com [172.18.179.151]) by rtp-core-2.cisco.com (8.12.10/8.12.6) with ESMTP id j1LI9AhF000739 for ; Mon, 21 Feb 2005 13:09:10 -0500 (EST) Message-ID: <421A23C6.5020508@cisco.com> Date: Mon, 21 Feb 2005 13:09:10 -0500 From: Ernest Christley User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20040929 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: PSRU - gear sets References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Ed Anderson wrote: >Ernest, I think you might be referring to the time Tracy received some drive >shafts which had not been manufactured correctly. Wasn't an incompatibility >problem it was failure in manufacturing and quality control. > >Ed A > > > Yeah, that was it. He ended up having to ship a bunch of units back, right? I just vaguely remember it, with the basic lessons being to carefully check my gearset with a strong backlight before trusting life and limb and that all gearset are NOT created equal. I remember the lesson more clearly than what taught it, which led to my reluctance to swap gears. Now that I realize that I can inspect the switch in the store...No problem. I'll swap out for the 6-planet set with the steel carrier next week. My investigation has reveal what Tracy was saying earlier, though. I don't yet know if it is the front or rear gear set, buy there are a lot of variations that actually have different reduction rates. But again, I won't leave the store without something that works properly, even if it is what I have. One question I still have, though. I've read that the major wear factor on a gear set is the number of torque reversals. Wouldn't a 6-planet set induce twice the number of reversals as the 3-planet? And how much difference will it make if you're using the same sun and ring gears? Well, two questions. Some of the racing sites are advertising planet sets with needle bearings under the planets. Claims to reduce rolling resistance and increase torque. Smells of snake oil to me, but since I'm switching out anyway, is there any merit to this? Ernest (you are in a maze of reduction gears...all slightly different)