Return-Path: Received: from mail.viclink.com ([66.129.220.6] verified) by logan.com (CommuniGate Pro SMTP 4.2.1) with ESMTP id 410160 for flyrotary@lancaironline.net; Tue, 14 Sep 2004 08:55:52 -0400 Received-SPF: none receiver=logan.com; client-ip=66.129.220.6; envelope-from=pjmick@mail.viclink.com Received: from mail.viclink.com (p031.AS1.viclink.com [66.129.192.31]) by mail.viclink.com (8.11.7/8.11.7) with ESMTP id i8ECtLD68834 for ; Tue, 14 Sep 2004 05:55:21 -0700 (PDT) Message-ID: <4146E9EA.5080506@mail.viclink.com> Date: Tue, 14 Sep 2004 05:54:02 -0700 From: Perry Mick User-Agent: Mozilla/5.0 (Windows; U; Win95; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: NACA vs. P51 Scoop References: Content-Type: multipart/alternative; boundary="------------050002030905080801050604" X-RAVMilter-Version: 8.4.3(snapshot 20030217) (mail.viclink.com) --------------050002030905080801050604 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Dale Rogers wrote: >Randy, > > You asked: > > > >>1. I am building a Cozy MKIV. It uses an NACA scoop embedded in >>the belly to provide cooling air. I am thinking of not building the >>NACA scoop as I plan to use some sort of Meredith effect scoop/plenum >>(ala the P-51) for cooling. Thoughts? >> >> > > There are flyers who have successfully used each approach. For example, John Slade gets adaquate cooling >with a NACA scoop; and, the last time I looked, Perry Mick >was using a P-51 style scoop on his Ducted Fan L-EZ. > >Dale R. >COZY MkIV-R13BNA #1254 >Ch's 4, 5, & 23 > > I still have the NACA. I have no cooling problems because the ducted fan assists airflow through the rad. About a year ago I lowered the inlet lip about 1", increasing inlet area to the rad, and making sort of a scoop out of the NACA. But it had no effect. My rad cooling is sufficient, but it's limitation is probably my small rad size and not airflow. Eventually I will probably grind all that NACA stuff off the belly and use the original Long-EZ P-51-type scoop. My LEZ fuselage tub was fabricated to the original design, the NACA was added on later, unlike the Cozy, which I think has the NACA designed into the fuselage tub. Perry --------------050002030905080801050604 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Dale Rogers wrote:

Randy,

   You asked:

1.	I am building a Cozy MKIV.  It uses an NACA scoop embedded in
the belly to provide cooling air.  I am thinking of not building the
NACA scoop as I plan to use some sort of Meredith effect scoop/plenum
(ala the P-51) for cooling.  Thoughts?


   There are flyers who have successfully used each approach.  For example, John Slade gets adaquate cooling 
with a NACA scoop; and, the last time I looked, Perry Mick 
was using a P-51 style scoop on his Ducted Fan L-EZ.

Dale R.
COZY MkIV-R13BNA #1254
Ch's 4, 5, & 23

I still have the NACA. I have no cooling problems because the ducted fan assists airflow through the rad. About a year ago I lowered the inlet lip about 1", increasing inlet area to the rad, and making sort of a scoop out of the NACA. But it had no effect. My rad cooling is sufficient, but it's limitation is probably my small rad size and not airflow.
Eventually I will probably grind all that NACA stuff off the belly and use the original Long-EZ P-51-type scoop. My LEZ fuselage tub was fabricated to the original design, the NACA was added on later, unlike the Cozy, which I think has the NACA designed into the fuselage tub.

Perry
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