X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2085059 for flyrotary@lancaironline.net; Tue, 05 Jun 2007 09:11:17 -0400 Received-SPF: none receiver=logan.com; client-ip=205.152.59.64; envelope-from=rusty@radrotary.com Received: from ibm56aec.bellsouth.net ([65.6.194.9]) by imf16aec.mail.bellsouth.net with ESMTP id <20070605131037.UMIV4923.imf16aec.mail.bellsouth.net@ibm56aec.bellsouth.net> for ; Tue, 5 Jun 2007 09:10:37 -0400 Received: from rd ([65.6.194.9]) by ibm56aec.bellsouth.net with ESMTP id <20070605131036.CKXK9477.ibm56aec.bellsouth.net@rd> for ; Tue, 5 Jun 2007 09:10:36 -0400 From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Single rotor video Date: Tue, 5 Jun 2007 08:10:26 -0500 Message-ID: <011801c7a772$e93f0440$6e01a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0119_01C7A749.0068FC40" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6822 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 Importance: Normal Thread-Index: AcenL04pKvDHFlrZTyCeUTSI7fzwPQAQltNQ In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0119_01C7A749.0068FC40 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable How about a freewheel unit (slipper clutch) - should prevent alt least = the reversal part after the power-stroke...=20 =20 I know Rotax used those to get rid of resonant problems with their 912S, = and if I get to the point where I have to custom fit some sort of coupler, = I'll consider trying it. =20 =20 Also, visual impact is one thing, that may have NOTHING to do with the actual blade behaviour. Unless you take a strobe and watch, you might get some "funny show" - = frame rate of the video, etc.=20 =20 This is true, but there's no optical illusion I know of that can make = the prop move fore and aft when viewed directly from the side (in the arc). What you see is also consistent between viewing with your eyes, and the camera, which is another indication that it's real. A really high speed camera would be better for this though.=20 =20 Rusty =20 =20 =20 ------=_NextPart_000_0119_01C7A749.0068FC40 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
How about a freewheel unit (slipper clutch) - should prevent alt = least the=20 reversal part after the power-stroke... 
 
I know Rotax=20 used those to get rid of resonant problems with their 912S, and if = I get to=20 the point where I have to custom fit some sort of coupler,=20 I'll consider trying it.  
 
Also, visual impact is one thing, that may have NOTHING to do with = the=20 actual blade behaviour.
Unless you take a strobe and watch, you might get some "funny show" = - frame=20 rate of the video, etc. 
 
This is true,=20 but there's no optical illusion I know of that can make the prop = move fore=20 and aft when viewed directly from the side (in the = arc).  What=20 you see is also consistent between viewing with your eyes, and the = camera, which=20 is another indication that it's real.  A really high speed camera = would be=20 better for this though. 
 
Rusty
 
 
 
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