X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost06.isp.att.net ([207.115.11.56] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with ESMTP id 4481350 for flyrotary@lancaironline.net; Sat, 25 Sep 2010 22:38:39 -0400 Received-SPF: none receiver=logan.com; client-ip=207.115.11.56; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-85-189-64.mco.bellsouth.net[98.85.189.64]) by isp.att.net (frfwmhc06) with SMTP id <20100926023804H0600m3nhse>; Sun, 26 Sep 2010 02:38:04 +0000 X-Originating-IP: [98.85.189.64] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: simple dyno Date: Sat, 25 Sep 2010 22:38:07 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01CB5D02.532F5600" X-Mailer: Microsoft Office Outlook 11 Thread-Index: ActdCsst/sto1SGKSuipufdC0zYOHwAF/doQ X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01CB5D02.532F5600 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Andrew, It will be interesting to see what results you get. If you can't get the 7K rpm, at least this will give you a method to determine what HP you are actually producing. The various dyno sheets I have seen suggest that the HP of the rotary is pretty linear with rpm, with torque pretty flat from around 4K on out. Bill B _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Andrew Martin Sent: Saturday, September 25, 2010 7:38 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: simple dyno Kely, Bill, George I have the RD1-c gearbox so bar rpm will be 2456 if and only if I can get there with my non-tuned intake & exhaust. 1350mm x 90mm is 53.15"x3.542" 72" and 75" is way too long, according to the spreadsheet I'd be lucky to get 1300 prop rpm. the biggest I would attempt with the Renesis is 1500x100mm or 59.055"x3.937", I apologise for the earlier confusion, I'm Australian and work best with metrics. the calculation is over my head also, I just copied it from the spreadsheet. it lost formatting in the copy paste, the 3 & 5 are power of. X section = width. Longer, thicker bars would only be useful if you wanted to plot hp at lower rpm or could produce more Hp than I'm expecting. I just need a load on the engine to run it, thought I may as well have something that gives a result, whether it is accurate or not is immaterial, if changes to the engine result in higher rpm= progress, lower rpm = regression. Andrew martin ------=_NextPart_000_0006_01CB5D02.532F5600 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Andrew,

=

 

It will be interesting to see what = results you get.  If you can’t get the 7K rpm, at least this will = give you a method to determine what HP you are actually producing.  The = various dyno sheets I have seen suggest that the HP of the rotary is pretty linear = with rpm, with torque pretty flat from around 4K on = out.

 

Bill B

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Andrew Martin
Sent: Saturday, September = 25, 2010 7:38 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = simple dyno

 

Kely, Bill, George

 

I have the RD1-c gearbox so bar rpm will be 2456 if and only if = I can get there with my non-tuned intake & = exhaust.

1350mm x 90mm is = 53.15”x3.542”

 

72" and 75” is way too long, according to the = spreadsheet I’d be lucky to get 1300 prop rpm. the biggest I would attempt = with the Renesis is 1500x100mm or 59.055”x3.937”, I apologise for the earlier confusion, I’m Australian and work best with = metrics.

 

the calculation is over my head also, I just copied it from the spreadsheet. it lost formatting in the copy paste, the 3 & 5 are = power of. X section =3D width.

 

Longer, thicker bars would only be useful if you wanted to plot = hp at lower rpm or could produce more Hp than I’m expecting. I just need = a load on the engine to run it, thought I may as well have something that gives = a result, whether it is accurate or not is immaterial, if changes to the = engine result in higher rpm=3D progress, lower rpm =3D = regression.

 

Andrew martin

 

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