X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.3.3) with ESMTP id 4152623 for flyrotary@lancaironline.net; Thu, 04 Mar 2010 17:36:06 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=1.0 c=1 a=-ysDFG74nEMA:10 a=ayC55rCoAAAA:8 a=arxwEM4EAAAA:8 a=QdXCYpuVAAAA:8 a=7g1VtSJxAAAA:8 a=ekHE3smAAAAA:20 a=UretUmmEAAAA:8 a=Ia-xEzejAAAA:8 a=nUuTZ29dAAAA:8 a=L0rrtGmal1ZkgkEVaI4A:9 a=RAhSRs_gx8TV81dwVFUA:7 a=hBIEuC57nSRtY4pyxMo2hknrYTsA:4 a=5zrLeAV0Z70A:10 a=1vhyWl4Y8LcA:10 a=EzXvWhQp4_cA:10 a=NdgxhDk2p1fhP6JF:21 a=4LUgHcpjiO8Xr8ih:21 X-Cloudmark-Score: 0 X-Originating-IP: 75.191.186.236 Received: from [75.191.186.236] ([75.191.186.236:1116] helo=computername) by cdptpa-oedge04.mail.rr.com (envelope-from ) (ecelerity 2.2.2.39 r()) with ESMTP id 3F/14-13441-4B5309B4; Thu, 04 Mar 2010 22:35:32 +0000 From: "Ed Anderson" Message-ID: <3F.14.13441.4B5309B4@cdptpa-omtalb.mail.rr.com> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Vance Jaqua and Propellers Date: Thu, 4 Mar 2010 17:35:37 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: Acq75gjrQpE46iqMQSe4jQSTzLK4fAABNUlA In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Your rule of thumb certainly seemed to work in my case minus 2" = 200 rpm increase Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.rotaryaviation.com/Rotorhead%20Truth.htm -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ernest Christley Sent: Thursday, March 04, 2010 4:59 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Vance Jaqua and Propellers Ed Anderson wrote: > > I certainly don't claim nor believe I understand props - I just go to > a reliable prop manufacture and tell told him what I had and what I > wanted. When I originally got my 76x88 prop, I decided I wanted 200 > more engine rpm and that is all I told Clark Lydic and he cut off an > 2" off the diameter and I got my 200 rpm increase. Could have been > just lucky, but a good prop guy can give you the right prop - IF you > give him the right information. > The library section of my website I have a document call "How I Make Prop" (or something like that). The author's rule of thumb was that 1" off the prop tip will increase RPM by 100. Real world confirmation of rules of thumb cause me to giggle like a little girl. -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com