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Message-ID: <5cf132c0711121128v7060357bg5d141fbe48b3f8ca@mail.gmail.com>
Date: Mon, 12 Nov 2007 13:28:35 -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,

Your cruise rpm is very close to what Tracy mentioned.  I'm assuming that
you're using the factory 550cc injectors?  I'll have to go through the FFCA=
L
process and see what that does to my fuel flow numbers.

Mark S.


On 11/12/07, Al Gietzen <ALVentures@cox.net> wrote:
>
>   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 a=
nd
> 11.2 - 11.5 gph, but this is only at about 3000 msl.  I would expect lowe=
r
> fuel burn at higher altitudes, but that will have to wait for later.
>
>  Mark
>
> Sorry; meant to include that, the data I took was at about 5300 RPM.  I
> don't have enough experience with it to say that is optimum, but it does
> seem that 5200-5300 is a good place for moderate cruise.
>
>
>
> Also, I haven't calibrated my fuel burn either (not sure how to do that).
>
> See instructions for the FFCAL parameter in Tracy's EM2 writeup.  I think
> the default was set at 156. I've had to increase that quite a bit =96 I t=
hink
> mine is now at about 240; which just happens to be the ratio of 3:2
> (rotors).  Over the last 20 gallons, the measured fuel and the EM2 fuel b=
urn
> agree within a few percent.
>
>
>
> Al
>
>
>
>
>
>

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<div>Al,</div>
<div>&nbsp;</div>
<div>Your cruise rpm is very close to what Tracy mentioned.&nbsp; I&#39;m a=
ssuming that you&#39;re using the factory 550cc injectors?&nbsp; I&#39;ll h=
ave to go through the FFCAL process and see what&nbsp;that does&nbsp;to&nbs=
p;my fuel flow numbers.&nbsp;=20
</div>
<div>&nbsp;</div>
<div>Mark S.<br><br>&nbsp;</div>
<div><span class=3D"gmail_quote">On 11/12/07, <b class=3D"gmail_sendername"=
>Al Gietzen</b> &lt;<a href=3D"mailto:ALVentures@cox.net">ALVentures@cox.ne=
t</a>&gt; wrote:</span>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div lang=3D"EN-US" vlink=3D"blue" link=3D"blue">
<div>
<div>
<p style=3D"MARGIN-LEFT: 0.5in"><font face=3D"Times New Roman" size=3D"3"><=
span style=3D"FONT-SIZE: 12pt">Al,</span></font></p></div>
<div>
<p style=3D"MARGIN-LEFT: 0.5in"><font face=3D"Times New Roman" size=3D"3"><=
span style=3D"FONT-SIZE: 12pt">&nbsp;</span></font></p></div>
<div>
<p style=3D"MARGIN-LEFT: 0.5in"><font face=3D"Times New Roman" size=3D"3"><=
span style=3D"FONT-SIZE: 12pt">What rpm do you normally see in cruise?&nbsp=
; I&#39;m curious as </span></font>Tracy pointed out that the most economic=
al 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;=20
11.2 - 11.5 gph, but this is only at about&nbsp;3000 msl.&nbsp; I would exp=
ect lower fuel burn at higher altitudes, but that will&nbsp;have to wait fo=
r later.&nbsp; </p></div>
<div>
<p style=3D"MARGIN-LEFT: 0.5in"><font face=3D"Times New Roman" size=3D"3"><=
span style=3D"FONT-SIZE: 12pt">&nbsp;Mark<br><br></span></font></p>
<p><font face=3D"Verdana" color=3D"blue" size=3D"2"><span style=3D"FONT-SIZ=
E: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Sorry; meant to include that, t=
he data I took was at about 5300 RPM.&nbsp; I don't have enough experience =
with it to say that is optimum, but it does seem that 5200-5300 is a good p=
lace for moderate cruise.
</span></font></p>
<p><font face=3D"Times New Roman" size=3D"3"><span style=3D"FONT-SIZE: 12pt=
">&nbsp;</span></font></p>
<p><font face=3D"Times New Roman" size=3D"3"><span style=3D"FONT-SIZE: 12pt=
">Also, I haven&#39;t calibrated my fuel burn either&nbsp;(not sure how to =
do that).</span></font></p>
<p><font face=3D"Verdana" color=3D"blue" size=3D"2"><span style=3D"FONT-SIZ=
E: 11pt; COLOR: blue; FONT-FAMILY: Verdana">See instructions for the FFCAL =
parameter in </span></font><font face=3D"Verdana" color=3D"blue" size=3D"2"=
><span style=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">
Tracy</span></font><font face=3D"Verdana" color=3D"blue" size=3D"2"><span s=
tyle=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">'s EM2 writeup.=
&nbsp; I think the default was set at 156. I've had to increase that quite =
a bit =96 I think mine is now at about 240; which just happens to be the ra=
tio of 3:2 (rotors).&nbsp; Over the last 20 gallons, the measured fuel and =
the EM2 fuel burn agree within a few percent.
</span></font></p>
<p><font face=3D"Verdana" color=3D"blue" size=3D"2"><span style=3D"FONT-SIZ=
E: 11pt; COLOR: blue; FONT-FAMILY: Verdana">&nbsp;</span></font></p>
<p><font face=3D"Verdana" color=3D"blue" size=3D"2"><span style=3D"FONT-SIZ=
E: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Al</span></font></p>
<p style=3D"MARGIN-LEFT: 0.5in"><font face=3D"Times New Roman" size=3D"3"><=
span style=3D"FONT-SIZE: 12pt"><br>&nbsp;</span></font></p></div>
<p style=3D"MARGIN-LEFT: 0.5in"><font face=3D"Times New Roman" size=3D"3"><=
span style=3D"FONT-SIZE: 12pt">&nbsp;</span></font></p></div></div></blockq=
uote></div><br>

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