X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3749966 for flyrotary@lancaironline.net; Wed, 08 Jul 2009 18:29:52 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (sv1-1.per.aanet.com.au [203.24.100.68]) by poplet2.per.eftel.com (Postfix) with ESMTP id 201AD17385C for ; Thu, 9 Jul 2009 06:29:11 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id 924BDBEC01D for ; Thu, 9 Jul 2009 06:29:10 +0800 (WST) Message-ID: From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Spreadsheet for Prop Tip Speed PropTipSpeedCal.xls Date: Thu, 9 Jul 2009 08:29:15 +1000 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 090708-0, 07/08/2009), Outbound message X-Antivirus-Status: Clean I like that one Ed, Given sufficient ground clearance and the fact the closer the speed of sound (SOS) the greater the prop efficiency, what is the collective thought on how close to the SOS one should aim for, given sufficient room for safety. George (down under) > Hi folks, > > Attached is a spreadsheet for calculation of propeller tip speed both > static > and moving through the air. Thanks to Bernie and Bill for the equations - > I > have not attempt to verify the equations, but they appear to be accurate > and > further more if you put zero airspeed in the moving prop equation, you get > the same calculated values as the static prop - so appears they are in > agreement and accurate. > > You may change any value shown in color Blue - the rest of the spreadsheet > is protected so folks don't accidentally erase an equation in a cell by > putting a number in it. But, you can view the equations in each cell, so > if > someone wants to duplicate it unprotected - have at it. > > Enjoy > > Ed > > > > The message is ready to be sent with the following file or link > attachments: > > PropTipSpeedCal.xls > > > Note: To protect against computer viruses, e-mail programs may prevent > sending or receiving certain types of file attachments. Check your e-mail > security settings to determine how attachments are handled. > > > __________ Information from ESET NOD32 Antivirus, version of virus > signature > database 3267 (20080714) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > -------------------------------------------------------------------------------- > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html >