Return-Path: Received: from out006.verizon.net ([206.46.170.106] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3132474 for flyrotary@lancaironline.net; Sun, 28 Mar 2004 23:26:29 -0500 Received: from netzero.net ([4.12.145.173]) by out006.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20040329042629.SEOR1634.out006.verizon.net@netzero.net> for ; Sun, 28 Mar 2004 22:26:29 -0600 Message-ID: <4067A570.4000401@netzero.net> Date: Sun, 28 Mar 2004 23:26:24 -0500 From: Finn Lassen User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Renesis & RD-1Cdrivetesting References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------010203070106070904070709" X-Authentication-Info: Submitted using SMTP AUTH at out006.verizon.net from [4.12.145.173] at Sun, 28 Mar 2004 22:26:29 -0600 This is a multi-part message in MIME format. --------------010203070106070904070709 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Would suggest a catch bottle for your vent line to see if that's where you lose it. Finn Tracy Crook wrote: > 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 the 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 > flogging 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, > Having an Ivo myself, it interesting that you could estimate 21" > of stalled airflow.. How'd ya do that? What's a cuff? > 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 though it was much better at > the root than the IVO. > > > Tracy (Yuck! fiberglass) > > --------------010203070106070904070709 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Would suggest a catch bottle for your vent line to see if that's where you lose it.

Finn

Tracy Crook wrote:

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 the 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 flogging 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,

Having an Ivo myself, it interesting that you could estimate 21" of stalled airflow.. How'd ya do that? What's a cuff?

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 though it was much better at the root than the IVO.

Tracy (Yuck! fiberglass)

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