X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet4.per.eftel.com ([203.24.100.41] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with ESMTP id 4481409 for flyrotary@lancaironline.net; Sun, 26 Sep 2010 00:34:07 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.41; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (mail.aanet.com.au [203.24.100.34]) by poplet4.per.eftel.com (Postfix) with ESMTP id D5EB03BFAC for ; Sun, 26 Sep 2010 12:33:30 +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 7D8ECC59C6 for ; Sun, 26 Sep 2010 12:33:30 +0800 (WST) Message-ID: From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: simple dyno Date: Sun, 26 Sep 2010 14:33:33 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0016_01CB5D87.CC25AB60" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5994 X-Antivirus: avast! (VPS 100925-1, 09/26/2010), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0016_01CB5D87.CC25AB60 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Andrew, A good static RPM is 6100 rpm (it would appear), that's 6,100 /2.17=3D = 2811rpm at the prop using the 2.17 reduction ratio. I don't know how much that compares to the wooden bar set-up. All things being equal you should achieve about 150 to 160 hp min given = nothing is optimized.=20 Is that enough for your needs. George (down under) 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=94x3.542=94 72" and 75=94 is way too long, according to the spreadsheet I=92d be = lucky to get 1300 prop rpm. the biggest I would attempt with the Renesis = is 1500x100mm or 59.055=94x3.937=94, I apologise for the earlier = confusion, I=92m 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=92m 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 ------=_NextPart_000_0016_01CB5D87.CC25AB60 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
 Andrew,
A good static RPM is 6100 rpm (it would = appear),=20 that's 6,100 /2.17=3D 2811rpm at the prop using the 2.17 reduction=20 ratio.
I don't know how much that compares to = the wooden=20 bar set-up.
All things being equal you should = achieve about 150=20 to 160 hp min given nothing is optimized.
Is that enough for your = needs.
George (down under)
Kely,=20 Bill, George

I have the RD1-c gearbox so bar rpm will be 2456 if and only if I = can get=20 there with my non-tuned intake & exhaust.
1350mm x 90mm is 53.15=94x3.542=94

72" and 75=94 is way too long, according to the spreadsheet I=92d = be lucky to=20 get 1300 prop rpm. the biggest I would attempt with the Renesis is = 1500x100mm=20 or 59.055=94x3.937=94, I apologise for the earlier confusion, I=92m = Australian and=20 work best with metrics.

the calculation is over my head also, I just copied it from the=20 spreadsheet. it lost formatting in the copy paste, the 3 & 5 are = power of.=20 X section =3D width.

Longer, thicker bars would only be useful if you wanted to plot = hp at=20 lower rpm or could produce more Hp than I=92m expecting. I just need a = load on=20 the engine to run it, thought I may as well have something that gives = a=20 result, whether it is accurate or not is immaterial, if changes to the = engine=20 result in higher rpm=3D progress, lower rpm =3D regression.

Andrew martin


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