X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mxo5.broadbandsupport.net ([209.55.3.85] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3750030 for flyrotary@lancaironline.net; Wed, 08 Jul 2009 19:23:39 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.55.3.85; envelope-from=candtmallory@cebridge.net Return-Path: Received: from [24.32.46.115] ([24.32.46.115:54507] helo=AcerPC) by mxo5.broadbandsupport.net (ecelerity 2.1.1.23 r(18304)) with ESMTP id 22/50-31834-25A255A4 for ; Wed, 08 Jul 2009 19:22:59 -0400 From: "chris and terria" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: I'm out for the move Date: Wed, 8 Jul 2009 18:22:55 -0500 Message-ID: <000901ca0023$0619f420$124ddc60$@net> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000A_01C9FFF9.1D43EC20" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AcoAB0Lc5u1veGY3QFiyJKs7qN7C4wAG6BaQ Content-Language: en-us This is a multipart message in MIME format. ------=_NextPart_000_000A_01C9FFF9.1D43EC20 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit All, I'm tuning out until I complete the move to NC. I'll check back in then. Chris From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of wrjjrs@aol.com Sent: Wednesday, July 08, 2009 3:06 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Spreadsheet for Prop Tip Speed PropTipSpeedCal.xls Ed very properly mentions that forward speed is a large component of the prop tip speed. On an RV-8 that could easily be 200 mph! Be sure to add all the factors Into the spread sheet. Bill Jepson Sent from my Verizon Wireless BlackBerry _____ From: Berniehb7448@wmconnect.com Date: Wed, 8 Jul 2009 15:46:23 EDT To: Rotary motors in aircraft Subject: [FlyRotary] Re: Spreadsheet for Prop Tip Speed PropTipSpeedCal.xls 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 ------=_NextPart_000_000A_01C9FFF9.1D43EC20 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

All,

I’m tuning out until I complete the move to = NC.  I’ll check back in then.

 

Chris

 

From:= Rotary = motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of = wrjjrs@aol.com
Sent: Wednesday, July 08, 2009 3:06 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Spreadsheet for Prop Tip Speed = PropTipSpeedCal.xls

 

Ed very properly mentions that forward speed is a = large component of the prop tip speed. On an RV-8 that could easily be 200 = mph! Be sure to add all the factors Into the spread sheet.
Bill Jepson

Sent from my Verizon Wireless BlackBerry

From: Berniehb7448@wmconnect.com
Date: Wed, 8 Jul 2009 15:46:23 EDT
To: Rotary motors in = aircraft<flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Spreadsheet for Prop Tip Speed PropTipSpeedCal.xls

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/
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Subject: [FlyRotary] Spreadsheet for Prop Tip Speed =  PropTipSpeedCal.xls
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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

------=_NextPart_000_000A_01C9FFF9.1D43EC20--