X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [206.46.252.48] (HELO vms048pub.verizon.net) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 912777 for flyrotary@lancaironline.net; Sun, 24 Apr 2005 00:08:27 -0400 Received: from verizon.net ([71.99.158.246]) by vms048.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0IFF00ASANI25ND8@vms048.mailsrvcs.net> for flyrotary@lancaironline.net; Sat, 23 Apr 2005 23:08:27 -0500 (CDT) Date: Sun, 24 Apr 2005 00:08:25 -0400 From: Finn Lassen Subject: Re: [FlyRotary] Apex seals/ groove wear In-reply-to: To: Rotary motors in aircraft Message-id: <426B1BB9.10804@verizon.net> MIME-version: 1.0 Content-type: multipart/alternative; boundary=------------040600060406070709060501 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. --------------040600060406070709060501 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit I think the 3mm seals are heavier. Needs stronger springs to force them to keep contact with the rotor housing after passing over the "hump". Heavier = more inertia = more force to move. Finn rijakits wrote: > Hi all, > > would a 3 mm "Tracy-seal" that tappers off to 2 mm have any merrit? > Supposedly the 3 mm don't seal the part the 2 mm do. > So why not have the rotors milled for 3 mm and use seals that have a > base/foot of 3 mm - as soon as they leave the rotor they tapper back > to 2 mm for better sealing (smaller radius on top? Apex seals are > radiused on the sealing side?) > Just speculating as I have no experience with this. > What causes the lesser sealing of the 3 mm? Less flex for the whole > seal or the bigger radius? Or....? > > Thomas Jakits --------------040600060406070709060501 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit I think the 3mm seals are heavier. Needs stronger springs to force them to keep contact with the rotor housing after passing over the "hump". Heavier = more inertia = more force to move.

Finn

rijakits wrote:
Hi all,
 
would a 3 mm "Tracy-seal" that tappers off to 2 mm have any merrit?
Supposedly the 3 mm don't seal the part the 2 mm do.
So why not have the rotors milled for 3 mm and use seals that have a base/foot of 3 mm - as soon as they leave the rotor they tapper back to 2 mm for better sealing (smaller radius on top? Apex seals are radiused on the sealing side?)
Just speculating as I have no experience with this.
What causes the lesser sealing of the 3 mm? Less flex for the whole seal or the bigger radius? Or....?
 
Thomas Jakits
--------------040600060406070709060501--