Return-Path: Received: from m12.lax.untd.com ([64.136.30.75] verified) by logan.com (CommuniGate Pro SMTP 4.2b4) with SMTP id 121532 for flyrotary@lancaironline.net; Wed, 02 Jun 2004 21:22:19 -0400 X-UNTD-OriginStamp: MJX/NhAS4UNn7QTm17yF8M7auTWABnp0M+/m41I22XLLRmfdkeTeLQ== Received: (from jschuber@juno.com) by m12.lax.untd.com (jqueuemail) id JW6QL8ZN; Wed, 02 Jun 2004 18:21:46 PDT To: flyrotary@lancaironline.net Date: Wed, 2 Jun 2004 20:32:10 -0400 Subject: Re: [FlyRotary] Re: 3rd flight Message-ID: <20040602.212248.-587023.15.jschuber@juno.com> X-Mailer: Juno 5.0.33 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary=--__JNP_000_2c8f.33b8.779a X-Juno-Line-Breaks: 8-6,7-8,12-21,23-27,32-37,42,43-32767 From: Terry L Schubert This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ----__JNP_000_2c8f.33b8.779a Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Steve, The outlet only needs to be about 1.6 MAX times the inlet area to carry off the heat. Have you measured the pressure difference across the high and low pressure sides of the cowl to see what cooling potential you actually have? Do you know how to do that? Terry Schubert Central States Association Newsletter Editor On Wed, 02 Jun 2004 07:58:54 -0400 Bulent Aliev writes: On 6/2/04 7:29 AM, "Steve Brooks" wrote: Rusty, I had started with the stock Cozy cowling, and modified it for the rotary. I left the original opening at the rear wide open to start with. I figured that if cooling was good, I could start closing it off. You can see the aft opening in the attached photo. It is probably 2-3 times the sum of all 3 scoops. Steve Steve, one possibility is that the Ivo prop’s root section is creating back pressure in flight. Years ago some canard flyers did testing in flight and found there was reverse flow around the hub area. Ivo prop’s first 1/3section from the hub has very little pitch, and the faster you go, it acts more like flat disk. Bulent ----__JNP_000_2c8f.33b8.779a Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Re: 3rd flight
Steve,
 
The outlet only needs to be about 1.6 MAX times the inlet area to = carry off=20 the heat.  Have you measured the pressure difference across the high = and=20 low pressure sides of the cowl to see what cooling potential you actually=20 have?
 
Do you know how to do that?
 

Terry Schubert
Central States Association
Newsletter=20 Editor
 
 
On Wed, 02 Jun 2004 07:58:54 -0400 Bulent Aliev <atlasyts@bellsouth.net>=20 writes:
On 6/2/04 7:29 = AM,=20 "Steve Brooks" <steve@tsisp.com> wrote:

Rusty,
I had started with the stock Cozy cowling, and = modified=20 it for the rotary.  I left the original opening at the rear wide = open=20 to start with.  I figured that if cooling was good, I could start= =20 closing it off.  You can see the aft opening in the attached photo= .=20  It is probably 2-3 times the sum of all 3=20 scoops.

Steve

Steve, one possibility is = that the=20 Ivo prop=92s root section is creating back pressure in flight. Years ago = some=20 canard flyers did testing in flight and found there was reverse flow = around=20 the hub area. Ivo prop=92s first 1/3section from the hub has very little = pitch,=20 and the faster you go, it acts more like flat disk.
Bulent=20
 
----__JNP_000_2c8f.33b8.779a--