X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2392108 for flyrotary@lancaironline.net; Wed, 17 Oct 2007 14:23:49 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=dale.r@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao104.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20071017182119.RDHJ19862.fed1rmmtao104.cox.net@fed1rmimpo02.cox.net> for ; Wed, 17 Oct 2007 14:21:19 -0400 Received: from [127.0.0.1] ([72.223.50.74]) by fed1rmimpo02.cox.net with bizsmtp id 1WMG1Y00h1c3B5k0000000; Wed, 17 Oct 2007 14:21:19 -0400 Message-ID: <4716528E.9010206@cox.net> Date: Wed, 17 Oct 2007 11:21:02 -0700 From: Dale Rogers Reply-To: dale.r@cox.net User-Agent: Thunderbird 2.0.0.6 (Windows/20070728) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: BellMouth Article References: In-Reply-To: Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Ed Anderson wrote:
Yes, I thought it provided some good information that I had not seen anyplace else about bell mouths - didn't realize there was so much to them. But, I guess on the racing side 1.5HP can make that 1/1000 of a second difference in winning.

Ed


Ed,

   Unlike Lynn, it's been a very long time since I've raced.  However,
there can be a lot of things in a car that eat up horsepower, e.g
the components in the drive line.  I remember reading an article in
the late sixties the indicated that a car with a 140 hp engine might
only be delivering 35 hp to the wheels.  In that case, an increase of
1.5 hp would represent a 5% increase in NET horsepower to the
wheels.

   In our application, there is less attenuation, but a 1.5 hp increase -
for just changing a contour in the inlet - is almost "free" power..

YMMV,
Dale R.