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 5.3.2) with ESMTP id 4118438 for flyrotary@lancaironline.net; Tue, 09 Feb 2010 19:07:58 -0500 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 (mail.aanet.com.au [203.24.100.34]) by poplet2.per.eftel.com (Postfix) with ESMTP id 9B0531739A2 for ; Wed, 10 Feb 2010 08:07:23 +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 0F8C1BEC038 for ; Wed, 10 Feb 2010 08:07:22 +0800 (WST) Message-ID: From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: N.A. Renesis to turbo Date: Wed, 10 Feb 2010 10:07:23 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0071_01CAAA38.D6E346F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 100209-1, 02/09/2010), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0071_01CAAA38.D6E346F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Monty, Prop efficiency climbs (so I'm told) until it reaches speed of sound, so = I believe some try to take the prop as close to 3,000 rpm as possible, = yet some stay a conservative 2,700 rpm, what do you suggest, given all = the variables. George (down under) ----- Original Message -----=20 From: MONTY ROBERTS=20 To: Rotary motors in aircraft=20 Sent: Wednesday, February 10, 2010 9:55 AM Subject: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: = N.A. Renesis to turbo Al, 5-6 more than he got or 5-6 more than base line? You also have to take into account that prop efficiency falls off = pretty steeply with increased speed and rpm. Especially if the tips = start to go transonic. There are some airplanes out there with CS props = that will go slower with the engine at redline, even though the engine = is making more power, because the prop is eating all of the extra and = then some. Hate to see you selling your plane, she's a beauty. Wish I had the = dough. Looking forward to the next project...there will be a next one = won't there ;-).=20 Monty ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Tuesday, February 09, 2010 5:47 PM Subject: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: = N.A. Renesis to turbo Subject: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: = N.A. Renesis to turbo Hp =3D C*V^3 Is that simple enough? Simple enough - and with some other numbers Ed gave I compute he = should get 5-6 kts more top end. Al -------------------------------------------------------------------------= --- No virus found in this incoming message. Checked by AVG - www.avg.com=20 Version: 8.5.435 / Virus Database: 271.1.1/2677 - Release Date: = 02/09/10 07:35:00 ------=_NextPart_000_0071_01CAAA38.D6E346F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Monty,
Prop efficiency climbs (so I'm told) = until it=20 reaches speed of sound, so I believe some try to take the prop  as = close to=20 3,000 rpm as possible, yet some stay a conservative 2,700 rpm, what do = you=20 suggest, given all the variables.
George (down under)
----- Original Message -----
From:=20 MONTY ROBERTS
Sent: Wednesday, February 10, = 2010 9:55=20 AM
Subject: [FlyRotary] Re: rpm vs = Power was=20 : Throttle limits was Re: N.A. Renesis to turbo

Al,
 
5-6 more than he got or 5-6 more than = base=20 line?
 
You also have to take into account = that prop=20 efficiency falls off pretty steeply with increased speed and rpm. = Especially=20 if the tips start to go transonic. There are some airplanes out there = with CS=20 props that will go slower with the engine at redline, even = though the=20 engine is making more power, because the prop is eating all = of the=20 extra and then some.
 
Hate to see you selling your plane, = she's a=20 beauty. Wish I had the dough. Looking forward to the next = project...there will=20 be a next one won't there ;-). 
 
Monty
----- Original Message -----
From:=20 Al = Gietzen=20
To: Rotary motors in = aircraft=20
Sent: Tuesday, February 09, = 2010 5:47=20 PM
Subject: [FlyRotary] Re: rpm = vs Power=20 was : Throttle limits was Re: N.A. Renesis to turbo

Subject:=20 [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: N.A. = Renesis to=20 turbo

 

Hp =3D=20 C*V^3

 

Is that simple enough?

Simple = enough =96=20 and with some other numbers Ed gave I compute he should get 5-6 kts = more top=20 end.

Al


No virus found in this incoming message.
Checked by = AVG - www.avg.com
Version: 8.5.435 / = Virus=20 Database: 271.1.1/2677 - Release Date: 02/09/10=20 07:35:00
------=_NextPart_000_0071_01CAAA38.D6E346F0--