Return-Path: Received: from [206.46.252.42] (HELO vms042pub.verizon.net) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 884580 for flyrotary@lancaironline.net; Wed, 20 Apr 2005 10:28:06 -0400 Received: from verizon.net ([71.98.175.156]) by vms042.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0IF9007FB1ILUDG2@vms042.mailsrvcs.net> for flyrotary@lancaironline.net; Wed, 20 Apr 2005 09:27:58 -0500 (CDT) Date: Wed, 20 Apr 2005 10:27:53 -0400 From: Finn Lassen Subject: Re: [FlyRotary] New Rotors! In-reply-to: To: Rotary motors in aircraft Message-id: <426666E9.1000601@verizon.net> MIME-version: 1.0 Content-type: multipart/alternative; boundary=------------070209050304030505000003 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. --------------070209050304030505000003 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Those numbers do not make sense. Aren't the seal 2 mm? How will they fit in a 1.778mm groove? Finn Ed Anderson wrote: > Got the new rotors today - first time I've ever seen a new rotor - the > are bright metallic {:>). > > The depth of the apex seal slot on the new rotors ranged from 9.65mm > to 9.77 mm. Interestingly the width of the bottom of the apex slot > was 1.88mm but the top was narrower at 1.778mm. I noticed that the > lip of the apex seal slot had a tiny burr of metal along it as if they > were not using a sharp enough tool or else pushing it along too fast. > Or perhaps no one took the time to deburr the slot. > > Just in case any of you ever wonder whether you are looking at a 9.7:1 > rotor or some other rotor, there is a fairly easy way to tell. Lay a > straight edge across the depression in the rotor and measure from its > bottom to the center of the depression, it should measure right at 4 > mm. The 9.1 measure around 7mm for comparison. Just thought you > might want to know. > > Ed > > Rv-6A N494BW Rotary Powered > Matthews, NC > eanderson@carolina.rr.com --------------070209050304030505000003 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Those numbers do not make sense. Aren't the seal 2 mm? How will they fit in a 1.778mm groove?

Finn

Ed Anderson wrote:

Got the new rotors today - first time I've ever seen a new rotor - the are bright metallic {:>).

The depth of the apex seal slot on the new rotors ranged from 9.65mm to 9.77 mm. Interestingly the width of the bottom of the apex slot was 1.88mm but the top was narrower at 1.778mm. I noticed that the lip of the apex seal slot had a tiny burr of metal along it as if they were not using a sharp enough tool or else pushing it along too fast. Or perhaps no one took the time to deburr the slot.

Just in case any of you ever wonder whether you are looking at a 9.7:1 rotor or some other rotor, there is a fairly easy way to tell. Lay a straight edge across the depression in the rotor and measure from its bottom to the center of the depression, it should measure right at 4 mm. The 9.1 measure around 7mm for comparison. Just thought you might want to know.

Ed

Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com

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