Return-Path: Received: from web41511.mail.yahoo.com ([66.218.93.94] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with SMTP id 740109 for flyrotary@lancaironline.net; Tue, 15 Feb 2005 12:22:17 -0500 Received-SPF: none receiver=logan.com; client-ip=66.218.93.94; envelope-from=tomtugan@yahoo.com Received: (qmail 2391 invoked by uid 60001); 15 Feb 2005 17:21:31 -0000 Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; b=siDbO6T5T6Qp5DrPC31n25PTmrfu70IheFbdxjtWVa7JvSTl/AnbQ57lhYcUWHJn1PbjXiS4n01HBhAz3ruxo0AtlOFu47nd48AceWqep4Kxxx+Cgt9cVXZLnC883pBp0Apn278m9XbXmFluKpMwB3hyPdmwv7UTW+d5q9x/xgI= ; Message-ID: <20050215172131.2389.qmail@web41511.mail.yahoo.com> Received: from [63.224.93.112] by web41511.mail.yahoo.com via HTTP; Tue, 15 Feb 2005 09:21:31 PST Date: Tue, 15 Feb 2005 09:21:31 -0800 (PST) From: Tom Subject: Re: [FlyRotary] Re: Big Butterflies, was: Bruce Turrentine Intake To: Rotary motors in aircraft In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1739229384-1108488091=:1996" --0-1739229384-1108488091=:1996 Content-Type: text/plain; charset=us-ascii Thanks for that Bob, I'll be interested to hear how it turns out. Tom Bob White wrote: Hi Tom, I think there is a small error in your area calc. A = pi* r^2, so A = 3.14*(2.5625/2)^2 =~ 3.14*1.28*1.28 = 5.15 sq. in. I'm hoping to get the engine running pretty soon to get some idea of how well it is going to work. Bob White On Tue, 15 Feb 2005 08:54:12 -0800 (PST) Tom wrote: > > So lets take your butterfly size of 2 9/16 inches. > Bobs butterfly area = (2 9/16 / 2) x 3.14 = 4.02 square inches > Max supported airflow based on their rule-of-thumb = 4.02 x 140CFM = > 562CFM Max HP based on these (100HP per each 140CFM) = 402HP > The difference between the actual HP your motor will make and 402HP is > throttle-movement that would do nothing for you. > > Here's the website: > http://www.dune-buggy.com/turbo/intake.htm > > Still learning stuff, > Tom > > > > http://www.bob-white.com N93BD - Rotary Powered BD-4 (soon) >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html --------------------------------- Do you Yahoo!? Yahoo! Search presents - Jib Jab's 'Second Term' --0-1739229384-1108488091=:1996 Content-Type: text/html; charset=us-ascii

Thanks for that Bob,

I'll be interested to hear how it turns out.

Tom

Bob White <bob@bob-white.com> wrote:

Hi Tom,

I think there is a small error in your area calc. A = pi* r^2, so
A = 3.14*(2.5625/2)^2 =~ 3.14*1.28*1.28 = 5.15 sq. in.

I'm hoping to get the engine running pretty soon to get some idea of how
well it is going to work.

Bob White

On Tue, 15 Feb 2005 08:54:12 -0800 (PST)
Tom wrote:

>
> So lets take your butterfly size of 2 9/16 inches.
> Bobs butterfly area = (2 9/16 / 2) x 3.14 = 4.02 square inches
> Max supported airflow based on their rule-of-thumb = 4.02 x 140CFM =
> 562CFM Max HP based on these (100HP per each 140CFM) = 402HP
> The difference between the actual HP your motor will make and 402HP is
> throttle-movement that would do nothing for you.
>
> Here's the website:
> http://www.dune-buggy.com/turbo/intake.htm
>
> Still learning stuff,
> Tom
>
>
>
>

http://www.bob-white.com
N93BD - Rotary Powered BD-4 (soon)

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