X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail.viclink.com ([206.212.237.11] verified) by logan.com (CommuniGate Pro SMTP 5.0c5) with ESMTP id 775953 for flyrotary@lancaironline.net; Fri, 21 Oct 2005 15:49:00 -0400 Received-SPF: none receiver=logan.com; client-ip=206.212.237.11; envelope-from=pjmick@mail.viclink.com Received: from [192.168.1.46] (pool-71-111-113-77.ptldor.dsl-w.verizon.net [71.111.113.77]) (authenticated bits=0) by mail.viclink.com (8.13.2/8.13.2) with ESMTP id j9LJm32v014528 for ; Fri, 21 Oct 2005 12:48:05 -0700 (PDT) Message-ID: <43594641.902@mail.viclink.com> Date: Fri, 21 Oct 2005 12:49:21 -0700 From: Perry Mick User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Fly Rotary Subject: Re: [FlyRotary] NACA Scoops Content-Type: multipart/alternative; boundary="------------010809090805060005070903" This is a multi-part message in MIME format. --------------010809090805060005070903 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Perry Mick wrote: > A - Burt Rutan started out with a P-51 style scoop on the >Vari-EZ. IIRC the early Long-EZs also had them. He later >changed to the NACA scoop because it was more "efficient" in >some combination of cooling efficiency vs. drag. Burt Rutan never put a NACA scoop on the Long-EZ. You would have to go look at the old canard pushers to see who was the first to do it, I don't remember. But it was an "aftermarket" idea that was very widely copied. Whoever it was sold plans I think. It became the norm and Puffer copied it on the Cozy IV. >I know Burt's Long-EZ had a P-51 scoop. Perhaps Burt didn't initiate it, >but IIRC my Long-EZ plans incorporated it. It's been so long that I'm not >positive, but I'm pretty sure. It was never in the plans, and I don't even think RAF sold the plans for it. But it was discussed in the Canard Pusher. It was an add-on to the belly of the Long-EZ. I borrowed the template from another LEZ builder so that's why I don't remember who sold the plans. I could easily remove it from mine, and probably will if I ever have to take the engine off and build my new engine mount design. I have not had the engine off in over 4 years and over 350 hours. >What I AM positive about is that NONE of the speed merchants use the P-51 >scoop and many use downdraft. You are probably correct! However they are 99% air-cooled installations. The most successful speed merchant I can think of with water cooling is Spencer LEZ with the Ford V8, doing around 240 mph. I think he might have a P51 scoop. Perry prev --------------010809090805060005070903 Content-Type: multipart/related; boundary="------------000703030501040706090702" --------------000703030501040706090702 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Perry Mick wrote:

> A - Burt Rutan started out with a P-51 style scoop on the
>Vari-EZ. IIRC the early Long-EZs also had them. He later
>changed to the NACA scoop because it was more "efficient" in
>some combination of cooling efficiency vs. drag.

Burt Rutan never put a NACA scoop on the Long-EZ. You would have to
go look at the old canard pushers to see who was the first to do
it, I don't remember. But it was an "aftermarket" idea that was
very widely copied. Whoever it was sold plans I think. It became
the norm and Puffer copied it on the Cozy IV.

>I know Burt's Long-EZ had a P-51 scoop. Perhaps Burt didn't initiate it,
>but IIRC my Long-EZ plans incorporated it. It's been so long that I'm not
>positive, but I'm pretty sure.

It was never in the plans, and I don't even think RAF sold the plans for it.
But it was discussed in the Canard Pusher. It was an add-on to the belly of
the Long-EZ. I borrowed the template from another LEZ builder so that's why
I don't remember who sold the plans. I could easily remove it from mine, and
probably will if I ever have to take the engine off and build my new engine
mount design. I have not had the engine off in over 4 years and over 350
hours.

>What I AM positive about is that NONE of the speed merchants use the P-51
>scoop and many use downdraft.

You are probably correct! However they are 99% air-cooled installations.
The most successful speed merchant I can think of with water cooling is
Spencer LEZ with the Ford V8, doing around 240 mph. I think he might have
a P51 scoop.

Perry



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