Return-Path: Received: from mail.viclink.com ([66.129.220.6] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2946022 for flyrotary@lancaironline.net; Fri, 23 Jan 2004 16:42:39 -0500 Received: from mail.viclink.com (p098.AS1.viclink.com [66.129.192.98]) by mail.viclink.com (8.11.7/8.11.7) with ESMTP id i0NLgaL15072 for ; Fri, 23 Jan 2004 13:42:36 -0800 (PST) Message-ID: <40119539.90902@mail.viclink.com> Date: Fri, 23 Jan 2004 13:42:17 -0800 From: Perry Mick User-Agent: Mozilla/5.0 (Windows; U; Win95; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Torsionals References: Content-Type: multipart/alternative; boundary="------------070206000705040807070207" X-RAVMilter-Version: 8.4.3(snapshot 20030217) (mail.viclink.com) --------------070206000705040807070207 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Tracy Crook wrote: > Don't know if anyone has commented on this already Pete, but yes, the > single rotor does have torque reversals. > > Don't know how much of a problem this will be but the torque > signature (IGNORE RPM FOR THIS COMPARISON, it doesn't matter) will be > the same as the three cylinder piston engine. Raven had a challenging > time developing a redrive for the Suzi/Geo 3 cyl. engine if that is > any clue. > > Tracy If the two rotor is similar to a 4 cylinder 4 stroke piston engine, wouldn't a one rotor be similar to a 2 cylinder 4 stroke engine? Lamar has published the plots many times showing no torque reversals for a two rotor but very strong torque reversals for a one rotor. -- Perry Mick http://www.ductedfan.com --------------070206000705040807070207 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Tracy Crook wrote:
Don't know if anyone has commented on this already Pete, but yes, the single rotor does have torque reversals. 
 
 Don't know how much of a problem this will be but the torque signature (IGNORE RPM FOR THIS COMPARISON, it doesn't matter)  will be the same as the three cylinder piston engine.  Raven had a challenging time developing a redrive for the Suzi/Geo 3 cyl. engine if that is any clue.
 
Tracy
If the two rotor is similar to a 4 cylinder 4 stroke piston engine, wouldn't a one rotor be similar to a 2 cylinder 4 stroke engine? Lamar has published the plots many times showing no torque reversals for a two rotor but very strong torque reversals for a one rotor.
-- 
Perry Mick
http://www.ductedfan.com

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