X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wx-out-0506.google.com ([66.249.82.224] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2723914 for flyrotary@lancaironline.net; Sun, 10 Feb 2008 20:57:17 -0500 Received-SPF: pass receiver=logan.com; client-ip=66.249.82.224; envelope-from=msteitle@gmail.com Received: by wx-out-0506.google.com with SMTP id i27so4180131wxd.25 for ; Sun, 10 Feb 2008 17:56:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; bh=VX/46852PaqgmT3p+4YIbOh2W8OdSQVhMn2de+d5Zfg=; b=Mim6aYzQtlHOktybaFWscmHSzHJFCf9KJSHJpPk7nFvsMPBmhu/nVsj14RWBU0OxJlOvEddRNGWBgbcAZURhFcnM69dWBCzFB4mlwBLyGa3b5voXeLLCb1U+Gxn9d5HnLjorA5ZjStUfqodwPWhJ0IRKxWVwScU0ok6n6h/7fks= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=Giawjo++MwowYQwjaQ8Om1tbuSWE16pziHmUVOrL44NhBHc/hfvgL7r2Qctx08BN8dL3IDnOa2KO6NenJz3Z5xLKuuKS23CjVVvOhTG3nAktZkkG9L1TRAKzZ/cNFng1+Ja0XOXYDkFbmUzbuYI6VjrBOptFG/LMqYIA0fxP1dI= Received: by 10.151.43.19 with SMTP id v19mr822087ybj.195.1202694997744; Sun, 10 Feb 2008 17:56:37 -0800 (PST) Received: by 10.70.20.3 with HTTP; Sun, 10 Feb 2008 17:56:37 -0800 (PST) Message-ID: <5cf132c0802101756t73a03e14gd15f546fa324487b@mail.gmail.com> Date: Sun, 10 Feb 2008 19:56:37 -0600 From: "Mark Steitle" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Fuel burn In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_18525_30125383.1202694997740" References: ------=_Part_18525_30125383.1202694997740 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Charlie, Not sure about that. However, the controller range starts at 1700rpm and goes up to 2700rpm. So, I assume it is designed to operate as low as that. With a 2.85 gearbox, I don't ever run up in the high end of the prop rpm range. Too bad the 2.17 box turns backwards. Mark On Feb 10, 2008 6:06 PM, Charlie England wrote: > Hi Mark, > > Isn't 7000/2.85=2456.14 ?? > > Is the M/T optimized (diameter, pitch, twist) for turning only 2150rpm? > > Charlie > > > Mark Steitle wrote: > > Al, > > Yes, I'm running one of Tracy's 2.85:1.00 boxes. > > Mark > > On Feb 10, 2008 12:20 PM, Al Gietzen wrote: > > > *Subject:* [FlyRotary] Re: Fuel burn > > > > > > > > Thanks, good data Al. I'm sure that some of the differences we're seeing > > are due to altitude. So far, I've stayed fairly low (3000-5000'). I may > > try some higher altitude flight soon just to see how it changes my > > performance numbers. Another difference is that I have a M/T electric > > constant speed prop. I normally set it to 2150rpm for takeoff. This allows > > the engine to turn around 7000 rpm, which will account some for the higher > > fuel burn I'm seeing. My airport is at 520' msl, so there's a 1000' > > difference there from your 1500' msl airport. Yes, she really accelerates > > down the runway. I'm usually airborne in about 900-1000'. > > > > Mark > > > > I'm not sure I see how these correlate "set it to 2150rpm for takeoff. > > This allows the engine to turn around 7000 rpm,"; but the big difference > > is that you're putting out more horses than I am. At 7000 you're likely > > looking at about 300 hp, so 25-26 gph would be expected. Are you running a > > 2.85 ratio redrive; or something else? > > > > Al > > > > > > > > -- > > Homepage: http://www.flyrotary.com/ > > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html > > ------=_Part_18525_30125383.1202694997740 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Charlie,
 
Not sure about that.  However, the controller range starts at 1700rpm and goes up to 2700rpm.  So, I assume it is designed to operate as low as that.  With a 2.85 gearbox, I don't ever run up in the high end of the prop rpm range.  Too bad the 2.17 box turns backwards. 

Mark

On Feb 10, 2008 6:06 PM, Charlie England <ceengland@bellsouth.net> wrote:
Hi Mark,

Isn't 7000/2.85=2456.14 ??

Is the M/T optimized (diameter, pitch, twist) for turning only 2150rpm?

Charlie


Mark Steitle wrote:
Al,

Yes, I'm running one of Tracy's 2.85:1.00 boxes.

Mark 

On Feb 10, 2008 12:20 PM, Al Gietzen <ALVentures@cox.net> wrote:

Subject: [FlyRotary] Re: Fuel burn

 

Thanks, good data Al. I'm sure that some of the differences we're seeing are due to altitude.  So far, I've stayed fairly low (3000-5000').  I may try some higher altitude flight soon just to see how it changes my performance numbers.  Another difference is that I have a M/T electric constant speed prop.  I normally set it to 2150rpm for takeoff.  This allows the engine to turn around 7000 rpm, which will account some for the higher fuel burn I'm seeing.  My airport is at 520' msl, so there's a 1000' difference there from your 1500' msl airport.  Yes, she really accelerates down the runway.   I'm usually airborne in about 900-1000'. 

Mark

I'm not sure I see how these correlate "set it to 2150rpm for takeoff.  This allows the engine to turn around 7000 rpm,"; but the big difference is that you're putting out more horses than I am.  At 7000 you're likely looking at about 300 hp, so 25-26 gph would be expected.  Are you running a 2.85 ratio redrive; or something else?

Al

 


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