Return-Path: Received: from rtp-iport-2.cisco.com ([64.102.122.149] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 740127 for flyrotary@lancaironline.net; Tue, 15 Feb 2005 12:30:52 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.102.122.149; envelope-from=echristl@cisco.com Received: from rtp-core-1.cisco.com (64.102.124.12) by rtp-iport-2.cisco.com with ESMTP; 15 Feb 2005 12:30:05 -0500 X-BrightmailFiltered: true X-Brightmail-Tracker: AAAAAA== Received: from [172.18.179.151] (echristl-linux.cisco.com [172.18.179.151]) by rtp-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id j1FHU21j014212 for ; Tue, 15 Feb 2005 12:30:03 -0500 (EST) Message-ID: <4212319A.5070800@cisco.com> Date: Tue, 15 Feb 2005 12:30:02 -0500 From: Ernest Christley User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20040929 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Big Butterflies, was: Bruce Turrentine Intake References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Tom wrote: > > At this website they said.... > "If the air valve is too big, you don't control the air flow. For > example, a smaller displacement engine will only flow X snip > " The rule of thumb for naturally aspirated fuel injection, at a > standard 1.5 inches of water column, is that for every square inch of > butterfly, you will flow 140 CFM. Tom, I think the second statement is more important than the first. Specifically "1.5 inches of water column". If you drop that standard to .5", you will have more power. The throttle will lose responsiveness and control, but except for formation flying, I don't think there is any need in an airplane for the type of throttle control a car generally has. I'd gladly accept a few more ponies for the ability to perfectly trim for 180kts vs 181kts. 8*)