X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-05.southeast.rr.com ([24.25.9.104] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2083328 for flyrotary@lancaironline.net; Mon, 04 Jun 2007 11:24:28 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.104; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-05.southeast.rr.com (8.13.6/8.13.6) with SMTP id l54FNiKB009191 for ; Mon, 4 Jun 2007 11:23:44 -0400 (EDT) Message-ID: <000701c7a6bc$cde8d880$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Single rotor video Date: Mon, 4 Jun 2007 11:27:03 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01C7A69B.46815050" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0004_01C7A69B.46815050 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageVery interesting, Rusty. I wonder if having only one rotor if torque reversal between firing = pulse might have more of an effect at slower rpm in loading/unloading = prop blades than at higher. Certainly makes you wonder with those = blades a bending out of sync like that {:>). But, you gyro fellow = don't let a small thing like that worry you {:>) Ed ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Monday, June 04, 2007 11:16 AM Subject: [FlyRotary] Single rotor video Greetings, I made a short video yesterday of a single rotor run. The purpose was = to demonstrate and document the prop tip behavior with the stock rubber = coupler/damper, so I can see if it gets any better with the new softer = one. =20 As you can see, it gets pretty wild at times, particularly when = changing rpms. I'm not sure this is completely abnormal though, because = I've watched the Subaru engines on the RAF2000 gyro do the exact same = thing. They even have a bit of tip wandering too, so some of this may = be OK.=20 During the video, you'll hear me say 2600 rpm, and at that point, the = tips are wandering fore and aft a bit. The next rpm tested was 3500, = and it appears fairly smooth. You'll note that my throttle control = doesn't have much friction, and closes itself if I don't hold it. By = the time I say 3500 rpm into the camera, you can see that the engine has = slowed down considerably, so 3500 is the point where I get up to come = back to the camera, not when I say 3500. For that reason, 4000 rpm = became a hand signal, and appears perfectly smooth. =20 The video is 60 MB, so not for the dialup crowd unless you download it = overnight. Also, if there's more traffic than I expect, I may have to = shut the link down to preserve my web space quota for the month. =20 http://www.radrotary.com/WL_original_damper.wmv Rusty=20 ------=_NextPart_000_0004_01C7A69B.46815050 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Very interesting, Rusty.
 
I wonder if having only one rotor if torque = reversal=20 between firing pulse might have more of an effect at slower rpm in=20 loading/unloading prop blades than at higher.  Certainly makes you = wonder=20 with those blades a bending out of sync like that {:>).   = But, you=20 gyro fellow don't let a small thing like that worry you = {:>)
 
Ed
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Monday, June 04, 2007 = 11:16=20 AM
Subject: [FlyRotary] Single = rotor=20 video

Greetings,
 
I made a = short video=20 yesterday of a single rotor run.  The purpose was to demonstrate = and=20 document the prop tip behavior with the stock rubber coupler/damper, = so I can=20 see if it gets any better with the new softer one.  =20
 
As you can = see, it gets=20 pretty wild at times, particularly when changing rpms.  I'm not = sure this=20 is completely abnormal though, because I've watched the Subaru engines = on the=20 RAF2000 gyro do the exact same thing.  They even have a bit of = tip=20 wandering too, so some of this may be OK.
 
During the = video, you'll=20 hear me say 2600 rpm, and at that point, the tips are wandering fore = and aft a=20 bit.  The next rpm tested was 3500, and it appears fairly = smooth. =20 You'll note that my throttle control doesn't have much friction, = and=20 closes itself if I don't hold it.  By the time I say 3500 rpm = into the=20 camera, you can see that the engine has slowed down considerably, so = 3500 is=20 the point where I get up to come back to the camera, not when I say=20 3500.  For that reason, 4000 rpm became a hand signal, and = appears=20 perfectly smooth.     
 
The video is = 60 MB, so=20 not for the dialup crowd unless you download it overnight.  Also, = if=20 there's more traffic than I expect, I may have to shut the link down = to=20 preserve my web space quota for the month. 
 
http://www.radro= tary.com/WL_original_damper.wmv
 
Rusty=20
 
 
 
 
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