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Message-ID: <5cf132c0711120824n7a5dfd99r46d771c3e3a48db7@mail.gmail.com>
Date: Mon, 12 Nov 2007 10:24:03 -0600
From: "Mark Steitle" <msteitle@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Fuel burn
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Al,

What rpm do you normally see in cruise?  I'm curious as Tracy pointed out
that the most economical rpm for the rotary engine is 5200.  When I dial my
prop speed down to 1700 and lean the mixture, I see about 5100-5200 rpm and
11.2 - 11.5 gph, but this is only at about 3000 msl.  I would expect lower
fuel burn at higher altitudes, but that will have to wait for later.  Also,
I haven't calibrated my fuel burn either (not sure how to do that).

Mark


On 11/12/07, Al Gietzen <ALVentures@cox.net> wrote:
>
>
>
> Al,
>
> Do you have a c/s or an in-flight adjustable prop?  If so, what settings
> were you using at the time?
>
>
>
> Mark S.
>
> Fixed pitch Catto 3-blade: 66 x 80.
>
>
>
> Al
>
>
>
> On 11/11/07, *Al Gietzen* <ALVentures@cox.net> wrote:
>
> I've finally got the EM2 fuel burn pretty well calibrated, and took note
> of some readings today.
>
>
>
> At 7500 ft I was cruisin' at 200 mph (TAS) at 20.7 mpg, 9.6 gph (average
> of two readings). MAP at about 17.2 . One reading at 8500, same speed, of
> 21.2 mpg.  This 20B is better on fuel than I expected; I like it!
>
>
>
> Al
>
>
>

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<div>Al,</div>
<div>&nbsp;</div>
<div>What rpm do you normally see in cruise?&nbsp; I&#39;m curious as Tracy pointed out that the most economical rpm&nbsp;for the rotary engine is 5200.&nbsp; When I dial my prop speed down to 1700 and lean the mixture, I see about 5100-5200 rpm and&nbsp;
11.2 - 11.5 gph, but this is only at about&nbsp;3000 msl.&nbsp; I would expect lower fuel burn at higher altitudes, but that will&nbsp;have to wait for later.&nbsp; Also, I haven&#39;t calibrated my fuel burn either&nbsp;(not sure how to do that).
</div>
<div>&nbsp;</div>
<div>Mark<br><br>&nbsp;</div>
<div><span class="gmail_quote">On 11/12/07, <b class="gmail_sendername">Al Gietzen</b> &lt;<a href="mailto:ALVentures@cox.net">ALVentures@cox.net</a>&gt; wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div lang="EN-US" vlink="blue" link="blue">
<div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">&nbsp;</span></font></p>
<div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">Al, </span></font></p></div>
<div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">Do you have a c/s or an in-flight adjustable prop?&nbsp; If so, what settings were you using at the time?&nbsp; </span></font></p></div>

<div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">&nbsp;</span></font></p></div>
<div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">Mark S.<br><br></span></font></p>
<p><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Fixed pitch Catto 3-blade: 66 x 80.</span></font></p>
<p><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">&nbsp;</span></font></p>
<p><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Al</span></font></p>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">&nbsp;</span></font></p></div>
<div>
<p style="MARGIN-LEFT: 0.5in"><span><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">On </span></font></span><span>11/11/07</span><span>, <b><span style="FONT-WEIGHT: bold">Al Gietzen</span></b> &lt;<a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:ALVentures@cox.net" target="_blank">
ALVentures@cox.net</a>&gt; wrote:</span> </p>
<div vlink="purple" link="blue">
<div>
<p style="MARGIN-LEFT: 0.5in"><font face="Verdana" size="2"><span style="FONT-SIZE: 11pt; FONT-FAMILY: Verdana">I&#39;ve finally got the EM2 fuel burn pretty well calibrated, and took note of some readings today.</span></font>
</p>
<p style="MARGIN-LEFT: 0.5in"><font face="Verdana" size="2"><span style="FONT-SIZE: 11pt; FONT-FAMILY: Verdana">&nbsp;</span></font></p>
<p style="MARGIN-LEFT: 1in"><font face="Verdana" size="2"><span style="FONT-SIZE: 11pt; FONT-FAMILY: Verdana">At 7500 ft I was cruisin&#39; at 200 mph (TAS) at 20.7 mpg, 9.6 gph (average of two readings). MAP at about 17.2
 . One reading at 8500, same speed, of 21.2 mpg.&nbsp; This 20B is better on fuel than I expected; I like it!</span></font></p>
<p style="MARGIN-LEFT: 1in"><font face="Verdana" size="2"><span style="FONT-SIZE: 11pt; FONT-FAMILY: Verdana">&nbsp;</span></font></p>
<p style="MARGIN-LEFT: 1in"><font face="Verdana" size="2"><span style="FONT-SIZE: 11pt; FONT-FAMILY: Verdana">Al</span></font></p></div></div></div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">&nbsp;</span></font></p></div></div></blockquote></div><br>

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