Return-Path: Received: from [65.54.169.65] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2945660 for flyrotary@lancaironline.net; Fri, 23 Jan 2004 12:05:20 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Fri, 23 Jan 2004 09:05:18 -0800 Received: from 67.24.245.148 by bay3-dav35.bay3.hotmail.com with DAV; Fri, 23 Jan 2004 17:05:18 +0000 X-Originating-IP: [67.24.245.148] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Torsionals Date: Fri, 23 Jan 2004 12:05:14 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A9_01C3E1A9.28C7A100" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Message-ID: X-OriginalArrivalTime: 23 Jan 2004 17:05:18.0815 (UTC) FILETIME=[141AB6F0:01C3E1D3] This is a multi-part message in MIME format. ------=_NextPart_000_00A9_01C3E1A9.28C7A100 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Don't know if anyone has commented on this already Pete, but yes, the = single rotor does have torque reversals.=20 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 ----- Original Message -----=20 From: Peter Zutrauen=20 To: Rotary motors in aircraft=20 Sent: Thursday, January 22, 2004 2:28 PM Subject: [FlyRotary] Re: Torsionals From what I understand, in addition to lowering the resonant frequency = it would also dissipate some of the resonant energy through flex-induced = heating - thus damping the system somewhat.. Exactly what one would want = (verses springs which dissipate very little). Other damping schemes = which I have heard of include both springs and hydraulic damping in = combination. =20 Cheers, Pete Europa builder and single rotor dreamer. =20 =20 PS- anyone out there care to comment on my previous question of = whether single-rotors do indeed experience torque reversals? =20 ------=_NextPart_000_00A9_01C3E1A9.28C7A100 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Don't know if anyone has commented on = this already=20 Pete, but yes, the single rotor does have torque = reversals. 
 
 Don't know how much of a problem = this will be=20 but the torque signature (IGNORE RPM FOR THIS COMPARISON, it doesn't=20 matter)  will be the same as the three cylinder piston = engine.  Raven=20 had a challenging time developing a redrive for the Suzi/Geo 3 cyl. = engine if=20 that is any clue.
 
Tracy
 
 
----- Original Message -----
From:=20 Peter=20 Zutrauen
Sent: Thursday, January 22, = 2004 2:28=20 PM
Subject: [FlyRotary] Re: = Torsionals

From what I = understand, in addition to lowering the resonant frequency it would = also=20 dissipate some of the resonant energy through flex-induced heating =96 = thus=20 damping the system somewhat=85. Exactly what one would want (verses = springs=20 which dissipate very little). Other damping schemes which I have heard = of=20 include both springs and hydraulic damping in=20 combination.

 

Cheers,

Pete

Europa builder = and single=20 rotor dreamer.

 

 

PS- anyone = out there=20 care to comment on my previous question of whether single-rotors do = indeed=20 experience torque reversals?

 

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