X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp109.sbc.mail.ne1.yahoo.com ([98.138.84.175] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTPS id 5024205 for flyrotary@lancaironline.net; Fri, 17 Jun 2011 23:57:55 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.84.175; envelope-from=echristley@att.net Received: from [192.168.1.2] (localhost [127.0.0.1]) by smtp109.sbc.mail.ne1.yahoo.com (8.14.4/8.14.4) with ESMTP id p5I3vKFa018497 for ; Fri, 17 Jun 2011 20:57:21 -0700 (PDT) (envelope-from echristley@att.net) Message-ID: <4DFC2220.3090905@att.net> Date: Fri, 17 Jun 2011 23:57:20 -0400 From: Ernest Christley Reply-To: echristley@att.net User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110424 Lightning/1.0b2 Thunderbird/3.1.10 MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Blower does work References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------010707050602090209090001" This is a multi-part message in MIME format. --------------010707050602090209090001 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit On 06/17/2011 07:10 PM, Bill Bradburry wrote: > > If the prop load was maxed out, the rpm would not increase, but the > MAP could go up. It sounds, tho, like this might not have been the > case since Earnest felt the prop was not pulling. > > Bill B > > First, the prop definitely was not pulling with any significance. The most it could do was scare my wife, and blow over a fan that I had sitting on top of a 5-gallon bucket. I'll fix that this weekend. Second, if the prop limits rpm, the MAP will not continue to increase. The blower is tied to the prop with a 3.18 gear ratio. Since it won't turn any faster, it won't be able to raise the MAP any further. --------------010707050602090209090001 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit On 06/17/2011 07:10 PM, Bill Bradburry wrote:

If the prop load was maxed out, the rpm would not increase, but the MAP could go up. It sounds, tho, like this might not have been the case since Earnest felt the prop was not pulling.

Bill B

First, the prop definitely was not pulling with any significance. The most it could do was scare my wife, and blow over a fan that I had sitting on top of a 5-gallon bucket. I'll fix that this weekend.

Second, if the prop limits rpm, the MAP will not continue to increase. The blower is tied to the prop with a 3.18 gear ratio. Since it won't turn any faster, it won't be able to raise the MAP any further.
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