X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-da06.mx.aol.com ([205.188.169.203] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3749743 for flyrotary@lancaironline.net; Wed, 08 Jul 2009 15:47:26 -0400 Received-SPF: none receiver=logan.com; client-ip=205.188.169.203; envelope-from=Berniehb7448@wmconnect.com Received: from imo-ma03.mx.aol.com (imo-ma03.mx.aol.com [64.12.78.138]) by imr-da06.mx.aol.com (8.14.1/8.14.1) with ESMTP id n68JkQdc011375 for ; Wed, 8 Jul 2009 15:46:26 -0400 Received: from Berniehb7448@wmconnect.com by imo-ma03.mx.aol.com (mail_out_v40_r1.5.) id q.bf0.544c2239 (32914) for ; Wed, 8 Jul 2009 15:46:23 -0400 (EDT) From: Berniehb7448@wmconnect.com Message-ID: Date: Wed, 8 Jul 2009 15:46:23 EDT Subject: Re: [FlyRotary] Spreadsheet for Prop Tip Speed PropTipSpeedCal.xls To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_bf0.544c2239.3786518f_boundary" X-Mailer: 6.0 for Windows XP sub 11501 X-Spam-Flag:NO --part1_bf0.544c2239.3786518f_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 7/8/2009 8:32:41 AM Central Daylight Time, eanderson@carolina.rr.com writes: > Subj:[FlyRotary] Spreadsheet for Prop Tip Speed PropTipSpeedCal.xls > Date:7/8/2009 8:32:41 AM Central Daylight Time > From: eanderson@carolina.rr.com (Ed Anderson) > Sender: flyrotary@lancaironline.net (Rotary motors in aircraft) > Reply-to: flyrotary@lancaironline.net (Rotary motors in aircraft) > To: flyrotary@lancaironline.net (Rotary motors in aircraft) > > File:PropTipSpeedCal.xls (28672 bytes) DL Time (49333 bps): < 1 minute > > > > 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 > > > ----------------------- Headers -------------------------------- > Return-Path: > Received: from rly-ma04.mx.aol.com (rly-ma04.mail.aol.com [172.20.116.48]) > by air-ma02.mail.aol.com (v124.15) with ESMTP id > MAILINMA023-8a14a549fe81f3; Wed, 08 Jul 2009 09:32:41 -0400 > Received: from logan.com (mail.logan.com [207.58.244.114]) by > rly-ma04.mx.aol.com (v124.15) with ESMTP id MAILRELAYINMA043-8a14a549fe81f3; Wed, 08 > Jul 2009 09:32:24 -0400 > X-Virus-Scanned: clean according to Sophos on Logan.com > X-ListServer: CommuniGate Pro LIST 5.2.14 > List-Unsubscribe: > List-ID: > List-Archive: > Precedence: list > Message-ID: > Reply-To: "Rotary motors in aircraft" > Sender: "Rotary motors in aircraft" > To: "Rotary motors in aircraft" > From: "Ed Anderson" > Date: Wed, 8 Jul 2009 09:32:04 -0400 > MIME-Version: 1.0 > Content-Type: multipart/mixed; > boundary="----=_NextPart_000_0000_01C9FFAE.F4671B00" > X-Original-Message-Id: < > 20090708133145097.FYNB19322@cdptpa-omta02.mail.rr.com> > Subject: [FlyRotary] Spreadsheet for Prop Tip Speed PropTipSpeedCal.xls > X-AOL-IP: 207.58.244.114 > X-AOL-SCOLL-SCORE:0:2:480857184:93952408 > X-AOL-SCOLL-URL_COUNT:0 > > > That spreadsheet is really cool! I did not know about what affects speed of sound (humidity, etc.), I thought it would be air density (altitude). Because of such arbitrary influences that can't be accounted for in a formula, I would probably "red-line" the RPM at no more than 100 MPH below speed of sound. Those influences could, at times, change the formula speed of sound while you are flying, so that your prop RPM could enter the speed of sound range just by chance of changing air properties. In my sample formula, you can see what the difference in RPM can do. Add 500 RPM, and it puts your prop tips a hair away from speed of sound. Do you think a 100 MPH below speed of sound limit is reasonably safe? Thanks, Bernie --part1_bf0.544c2239.3786518f_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable In a messag= e dated 7/8/2009 8:32:41 AM Central Daylight Time, eanderson@carolina.rr.c= om writes:


Subj:[FlyRotary] Spr= eadsheet for Prop Tip Speed PropTipSpeedCal.xls
Date:7/8/2009 8:32:41 AM Central Daylight Time
From:    eanderson@carolina.rr.com (Ed Anderson)
Sender:    flyrotary@lancaironline.net (Rotary motors= in aircraft)
Reply-to:    flyrotary@lancaironline.net (Rotary motors= in aircraft)
To:    flyrotary@lancaironline.net (Rotary motors in ai= rcraft)

File:PropTipSpeedCal.xls (28672 bytes) DL Time (49333 bps): <= ; 1 minute



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 eq= uations - I
have not attempt to verify the equations, but they appear to be accura= te 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 spreads= heet
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 attach= ments:

PropTipSpeedCal.xls


Note: To protect against computer viruses, e-mail programs may prevent
sending or receiving certain types of file attachments.  Check yo= ur e-mail
security settings to determine how attachments are handled.


__________ Information from ESET NOD32 Antivirus, version of virus sig= nature
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


----------------------- Headers --------------------------------
Return-Path: <flyrotary-report@lancaironline.net>
Received: from rly-ma04.mx.aol.com (rly-ma04.mail.aol.com [172.20.116.= 48]) by air-ma02.mail.aol.com (v124.15) with ESMTP id MAILINMA023-8a14a549= fe81f3; Wed, 08 Jul 2009 09:32:41 -0400
Received: from logan.com (mail.logan.com [207.58.244.114]) by rly-ma04= .mx.aol.com (v124.15) with ESMTP id MAILRELAYINMA043-8a14a549fe81f3; Wed,= 08 Jul 2009 09:32:24 -0400
X-Virus-Scanned: clean according to Sophos on Logan.com
X-ListServer: CommuniGate Pro LIST 5.2.14
List-Unsubscribe: <mailto:flyrotary-off@lancaironline.net>
List-ID: <flyrotary.lancaironline.net>
List-Archive: <http://lancaironline.net:81/Lists/flyrotary/List.htm= l>
Precedence: list
Message-ID: <list-3749133@logan.com>
Reply-To: "Rotary motors in aircraft" <flyrotary@lancaironline.net&= gt;
Sender: "Rotary motors in aircraft" <flyrotary@lancaironline.net>= ;
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
From: "Ed Anderson" <eanderson@carolina.rr.com>
Date: Wed, 8 Jul 2009 09:32:04 -0400
MIME-Version: 1.0
Content-Type: multipart/mixed;
   boundary=3D"----=3D_NextPart_000_0000_01C9FFAE.F467= 1B00"
X-Original-Message-Id: <20090708133145097.FYNB19322@cdptpa-omta02.m= ail.rr.com>
Subject: [FlyRotary] Spreadsheet for Prop Tip Speed  PropTipSpeed= Cal.xls
X-AOL-IP: 207.58.244.114
X-AOL-SCOLL-SCORE:0:2:480857184:93952408
X-AOL-SCOLL-URL_COUNT:0




That spreadsheet is really cool!  I did not know about what affec= ts speed of sound (humidity, etc.), I thought it would be air density (alt= itude). Because of such arbitrary influences that can't be accounted for= in a formula, I would probably "red-line" the RPM at no more than 100 MPH= below speed of sound. Those influences could, at times, change the formul= a speed of sound while you are flying, so that your prop RPM could enter= the speed of sound range just by chance of changing air properties.

In my sample formula, you can see what the difference in RPM can do.= Add 500 RPM, and it puts your prop tips a hair away from speed of sound.

Do you think a 100 MPH below speed of sound limit is reasonably safe?

Thanks, Bernie --part1_bf0.544c2239.3786518f_boundary--