X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [207.115.11.53] (HELO fmailhost01.isp.att.net) by logan.com (CommuniGate Pro SMTP 5.2.2) with ESMTP id 2874476 for flyrotary@lancaironline.net; Sun, 27 Apr 2008 15:30:29 -0400 Received-SPF: none receiver=logan.com; client-ip=207.115.11.53; envelope-from=rusty@radrotary.com Received: from rad (adsl-065-006-194-009.sip.pns.bellsouth.net[65.6.194.9]) by isp.att.net (frfwmhc03) with SMTP id <20080427192951H0300p87ile>; Sun, 27 Apr 2008 19:29:51 +0000 X-Originating-IP: [65.6.194.9] From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: single rotor with RD-1C Date: Sun, 27 Apr 2008 14:29:47 -0500 Message-ID: <006001c8a89d$0e539670$6c01a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0061_01C8A873.257D8E70" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6838 Importance: Normal Thread-Index: AcionQzm9WqMGgStRrOjSCy/h0oeDQ== X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0061_01C8A873.257D8E70 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Greetings, =20 I made a quick run of the single rotor today, with the RD-1C drive, and = Warp Drive prop. =20 =20 http://radrotary.com/RD1C_042708.wmv =20 The worst of the resonance is right where I remember it from before, = between about 2500 and maybe 3200. It's pretty clear by sight and sound when I = get past it. I only ran up to 4000, because this was the first run after putting the drive and prop on, and I wanted to make sure everything OK before going any higher. I also wanted to see the video first. I'll venture a bit higher next time. =20 =20 I'm actually quite encouraged by this. 2300 rpm is smooth, and almost = free from the fore/aft prop wandering effect of the resonance, so that would = make a decent idle speed (800 prop rpm). If nothing major changes with the Sensenich prop, I "could" just consider 2500-3500 a yellow arc, and not = do any extended operation there. I'll probably still consider a softer = damper, but not until after the engine is mounted on the plane (pile of aluminum = at the moment) with the final prop. For now, the engine is getting the = green light :-) =20 For the moment, the engine has a single Davies Craig EWP, and an = oil/water heat exchanger. The water lines are kinda small on the heat exchanger, = and I don't think the EWP isn't giving me enough differential pressure. I could probably keep either the EWP, or the oil/water exchanger, but not both. Tough to choose which of those features I like best. I've got a = long time to decide. =20 =20 Cheers, Rusty (anyone want an Autoflight redrive)=20 =20 =20 =20 =20 =20 ------=_NextPart_000_0061_01C8A873.257D8E70 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
Greetings,
 
I made a quick = run of=20 the single rotor today, with the RD-1C drive, and Warp Drive=20 prop. 
 
http://radrotary.com/RD1C_0= 42708.wmv
 
The worst of = the resonance=20 is right where I remember it from before, between about 2500 and = maybe=20 3200.  It's pretty clear by sight and sound when I get past = it.  I=20 only ran up to 4000, because this was the first run after putting the = drive and=20 prop on, and I wanted to make sure everything OK before going any=20 higher.  I also wanted to see the video first.  I'll = venture a=20 bit higher next time.    
 
I'm actually = quite=20 encouraged by this.  2300 rpm is smooth, and almost free from=20 the fore/aft prop wandering effect of the resonance, so that would = make a=20 decent idle speed (800 prop rpm).  If nothing major changes with = the=20 Sensenich prop, I "could" just consider 2500-3500 a yellow arc, and not = do any=20 extended operation there.  I'll probably still consider a softer = damper,=20 but not until after the engine is mounted on the plane (pile of aluminum = at the=20 moment) with the final prop.  For now, the engine is getting = the green=20 light :-)
 
For the moment, = the engine=20 has a single Davies Craig EWP, and an oil/water heat exchanger.  = The water=20 lines are kinda small on the heat exchanger, and I don't think the EWP = isn't=20 giving me enough differential pressure.   I could probably = keep either=20 the EWP, or the oil/water exchanger, but not both.  Tough to choose = which=20 of those features I like best.  I've got a long time to = decide. =20
 
Cheers,
Rusty (anyone want an=20 Autoflight redrive) 
 
 
 
 
 
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