X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.219.56.248] (HELO qnsi-xch.qnsi.net) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2784174 for flyrotary@lancaironline.net; Sun, 09 Mar 2008 12:09:52 -0400 Received-SPF: none receiver=logan.com; client-ip=66.219.56.248; envelope-from=bhughes@qnsi.net Content-class: urn:content-classes:message Return-Receipt-To: "Bobby J. Hughes" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C88200.08DE7D0E" Disposition-Notification-To: "Bobby J. Hughes" Subject: RE: [FlyRotary] Re: Incline Radiators X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0 Date: Sun, 9 Mar 2008 10:10:00 -0600 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Incline Radiators Thread-Index: AciB/loTSCUAzu5ESi6z30mbn9rQbgAAHz3g From: "Bobby J. Hughes" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C88200.08DE7D0E Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Need to clarify. The day we tested this duct we also sealed a radiator directly to the exit air plenum at several angles using foam board and aluminum tape. We did this at several angles and measured the airspeed through the core. With the NACA test we varied the angle of attack for climb and cruise. =20 Bobby ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook Sent: Sunday, March 09, 2008 10:56 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Incline Radiators I'm betting that this is probably true (angle not a big factor) since my RV-8 installation has a duct angle to rad of about 90 degrees. It cools on the ground at power levels high enough for level flight so I'm hopeful. As usual, the duct is everything. The duct MUST be tailored to the angle and that tailoring gets more difficult with increasing angles. =20 =20 Tracy (resisting the urge to buy a Versys) On Sun, Mar 9, 2008 at 11:44 AM, Bobby J. Hughes wrote: <> =09 Te <> sting at NAWTF (North Austin Wind Tunnel Facility):) last year determined the radiator angle made almost no difference with this duct. Dennis H. and I measured the airspeed on the backside of the core at several angles. Do not have the data handy but we observer about a 1 mph difference across all the angles we tested. What was interesting was the airspeed deceleration in this crude NACA duct. From entrance to the non-existent lip the airspeed dropped by 1/3. =09 Bobby (pics for your amusement) =09 =09 -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html =09 =09 ------_=_NextPart_001_01C88200.08DE7D0E Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Need to clarify. The day we tested this duct we = also sealed=20 a radiator directly to the exit air plenum at several angles using foam = board=20 and aluminum tape. We did this at several angles and measured the = airspeed=20 through the core. With the NACA test we varied the angle of = attack=20 for climb and cruise.

Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy=20 Crook
Sent: Sunday, March 09, 2008 10:56 AM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Incline=20 Radiators

I'm betting that this is probably true (angle not a big factor) = since my=20 RV-8 installation has a duct angle to rad of about 90 degrees. It = cools on=20 the ground at power levels high enough for level flight so I'm = hopeful. As=20 usual, the duct is everything. The duct MUST be tailored to the = angle and=20 that tailoring gets more difficult with increasing = angles.

Tracy (resisting the urge to buy a Versys)

On Sun, Mar 9, 2008 at 11:44 AM, Bobby J. = Hughes <bhughes@qnsi.net> wrote:

<<DSCF0462.JPG>>

Te=20 <<DSCF0460.JPG>> sting at NAWTF (North Austin Wind Tunnel=20 Facility):)
last year determined the radiator angle made almost no=20 difference with
this duct. Dennis H. and I measured the airspeed on = the=20 backside of the
core at several angles. Do not have the data handy = but we=20 observer about
a 1 mph difference across all the angles we tested.=20 What was
interesting was the airspeed deceleration in this = crude NACA=20 duct. From
entrance to the non-existent lip the airspeed dropped by = 1/3.

Bobby
(pics for your = amusement)

--
Homepage:=20 http://www.flyrotary.com/
Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.htm= l

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