X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [206.46.252.44] (HELO vms044pub.verizon.net) by logan.com (CommuniGate Pro SMTP 4.3.6) with ESMTP id 610335 for flyrotary@lancaironline.net; Thu, 21 Jul 2005 11:18:34 -0400 Received: from verizon.net ([71.99.157.179]) by vms044.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0IJZ00CDYH6PYZ57@vms044.mailsrvcs.net> for flyrotary@lancaironline.net; Thu, 21 Jul 2005 10:18:25 -0500 (CDT) Date: Thu, 21 Jul 2005 11:18:23 -0400 From: Finn Lassen Subject: Re: [FlyRotary] Re: RD-1B failure In-reply-to: To: Rotary motors in aircraft Message-id: <42DFBCBF.9020103@verizon.net> MIME-version: 1.0 Content-type: multipart/alternative; boundary=------------040703050409030701080808 X-Accept-Language: en-us, en References: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) This is a multi-part message in MIME format. --------------040703050409030701080808 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit David Leonard wrote: > On 7/21/05, Finn Lassen > wrote: > > Is it really miscolored blue like that? A lot of heat! Amazing if that > didn't transfer to the sun gears, but I suppose the oil could have > carried away the heat. I'd send the planet gear assembly as well, just > to be sure. > > > It is not blue, that is just the way it looks in the picture. > -- > Dave Leonard OK, never mind. BTW, in case anybody out there is alarmed about this "failure", here's something to consider: Any system will have a weak point. In case of a prop strike this is where I would prefer to have the PSRU fail, as opposed to an exploding housing, stripped teeth, etc. Now, it was my understanding that you won't have a complete loss of power, that the sun gear would slip, freeze on the shaft, slip again, etc. This may not be correct -- if the sun gear expands more than the input shaft I guess it will be able to rotate freely, but it seems some friction would remain? Finn --------------040703050409030701080808 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit David Leonard wrote:
On 7/21/05, Finn Lassen <finn.lassen@verizon.net> wrote:
Is it really miscolored blue like that? A lot of heat! Amazing if that
didn't transfer to the sun gears, but I suppose the oil could have
carried away the heat. I'd send the planet gear assembly as well, just
to be sure.
 
It is not blue, that is just the way it looks in the picture.
--
Dave Leonard
OK, never mind.

BTW, in case anybody out there is alarmed about this "failure", here's something to consider:
Any system will have a weak point. In case of a prop strike this is where I would prefer to have the PSRU fail, as opposed to an exploding housing, stripped teeth, etc.

Now, it was my understanding that you won't have a complete loss of power, that the sun gear would slip, freeze on the shaft, slip again, etc. This may not be correct -- if the sun gear expands more than the input shaft I guess it will be able to rotate freely, but it seems some friction would remain?

Finn
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