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X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail05.syd.optusnet.com.au ([211.29.132.186] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTPS id 2086051 for flyrotary@lancaironline.net; Tue, 05 Jun 2007 18:21:49 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.186; envelope-from=lendich@optusnet.com.au Received: from george (d220-236-153-25.dsl.nsw.optusnet.com.au [220.236.153.25]) by mail05.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l55ML4sn008253 for ; Wed, 6 Jun 2007 08:21:05 +1000 Message-ID: <002801c7a7bf$d06d88e0$1999ecdc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Single rotor video Date: Wed, 6 Jun 2007 08:21:06 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0025_01C7A813.A142E7F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0025_01C7A813.A142E7F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageRusty, If at all possible, I would consider the harder dampers, you can buy the = polyurethane off the shelf and turn it up in a lathe to make the size/ = shape you require. George ( down under) What a great video. I ran it in slow motion. =20 Hi Al, I never thought about running this in slow motion, but holy crap!!! =20 For the dialup folks, here are a couple frames from the video, when = the engine was probably around 2500 rpm. These are sequential frames, = so only a 30th of a second apart. Take a look at the blade flex, but = then note the position of the engine from rotational torque. It's = undeniable that this is a torque reversal issue. =20 Before I change dampers, I may make another video at more controlled = rpms, and with the camera zoomed in on the engine/prop more. =20 Rusty (creating a monster) -------------------------------------------------------------------------= ----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_0025_01C7A813.A142E7F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message

Rusty,

If at all possible, I would consider = the harder=20 dampers, you can buy the polyurethane off the shelf and turn it up in a = lathe to=20 make the size/ shape you require.

George ( down under)

What a great video. I ran it in slow motion.

Hi=20 Al,

I never=20 thought about running this in slow motion, but=20 holy crap!!!

For the=20 dialup folks, here are a couple frames from the video, when the engine = was=20 probably around 2500 rpm. These are sequential frames, so only a = 30th of=20 a second apart. Take a look at the blade flex, but then note=20 the position of the engine from rotational torque. It's = undeniable=20 that this is a torque reversal=20 issue.

Before I=20 change dampers, I may make another video at more controlled rpms, and = with the=20 camera zoomed in on the engine/prop more.

Rusty=20 (creating a monster)

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Archive and=20 UnSub: =20 = http://mail.lancaironline.net:81/lists/flyrotary/List.html
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