Return-Path: Received: from [65.54.168.112] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3132279 for flyrotary@lancaironline.net; Sun, 28 Mar 2004 21:08:50 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sun, 28 Mar 2004 18:08:49 -0800 Received: from 67.24.244.246 by bay3-dav8.bay3.hotmail.com with DAV; Mon, 29 Mar 2004 02:08:49 +0000 X-Originating-IP: [67.24.244.246] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Renesis & RD-1Cdrivetesting Date: Sun, 28 Mar 2004 21:08:48 -0500 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0000_01C41508.DD1B92F0" Message-ID: X-OriginalArrivalTime: 29 Mar 2004 02:08:49.0932 (UTC) FILETIME=[C6B204C0:01C41532] ------=_NextPart_001_0000_01C41508.DD1B92F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable That conclusion was based on measurements of the blade angle, prop rpm & = airspeed and calculating angle to airflow along with the assumption that = stall would occur when angle exceeded 15 deg. Then this SWAG was boiled = in a pot with observations of how adversely the cooling was affected by t= he IVO (stalled air blocking inlets). In other words, it's just my best guess. One more observation on the RD-1C testing. After about 5 hours of flogg= ing my 89 vintage 13B at engine speeds up to 7050 rpm, I noticed that the= oil level was down 1/2 quart. Had never seen a detectable drop in level= before. Tracy (still doing plastic surgery on the RVotter) Hi Tracy, =20 Having an Ivo myself, it interesting that you could estimate 21" of stall= ed airflow.. How'd ya do that? What's a cuff? =20 Tommy<>< I estimated there was a 21" diameter of stalled airflow on my IVO. You= might try making cuffs for that area. That's what I'm doing now on my P= erformance Prop even though it was much better at the root than the IVO. = =20 Tracy (Yuck! fiberglass) =20 ------=_NextPart_001_0000_01C41508.DD1B92F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
That conclusio= n was based on measurements of the blade angle, prop rpm & airspeed a= nd calculating angle to airflow along with the assumption that stall woul= d occur when angle exceeded 15 deg.  Then this SWAG was boiled in a = pot with observations of how adversely the cooling was affected by t= he IVO (stalled air blocking inlets).
 
In oth= er words, it's just my best guess.
 
One more&= nbsp; observation on the RD-1C testing.  After about 5 hours of= flogging my 89 vintage 13B at engine speeds up to 7050 rpm, I noticed th= at the oil level was down 1/2 quart.  Had never seen a detectable dr= op in level before.
 
Tracy (still doing plast= ic surgery on the RVotter)
 
 
Hi Tracy,
Having an Ivo myself, it interesting that you could es= timate 21" of stalled airflow..  How'd ya do that?  What's a cu= ff? 
Tommy<><
 
 I estimated there was a 21" diameter= of stalled airflow on my IVO.   You might try making cuffs for= that area.  That's what I'm doing now on my Performance Prop even t= hough it was much better at the root than the IVO. 
 
Tracy (Yuck!  fiberglass) 
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