REFLECTOR:Rotary 20B dyno Test
Dennis Martin
reflector@tvbf.org
Fri, 9 May 2003 13:32:37 -0600
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Rock on, rotory guy. Very impressive results, and I'm envious of how
silky smooth it's going to be when you get airborne.
Dennis Martin
Elite FG Chevy V-6
>
>
>I've completed dynamometer testing of my 3-rotor rotary engine.
> Overall; I'm very pleased. Great performance from a normally
>aspirated engine where the all-up installation weighs maybe 45 lbs
>more than a 200 hp Lyc. It should give me about 270 HP at my max
>operating point of 2900 prop speed. The following is a post to the
>rotary engine list (including a response from a rotary Guru), and a
>plot of sea level torque and HP. More info will eventually be
>available on my website.
>
>
>
>Al Gietzen
>
>
>
>POWER AND TORQUE
>
> >
>
> > Wide open throttle power and torque curves were run after adjusting
>
> > the mixture correction table and the timing. Mixture setting was
>
> > approximately for maximum power. Data was initially gathered up to
>
> > about 6000 RPM, but looking at the data showed that the torque curve
>
> > was still flat, and hp increasing, so subsequent runs were made to
>
> > 7000 RPM. Still no break in the hp curve. Given that the 2.17 redrive
>
> > ratio limits engine RPM to about 6300 (Prop @ 2900), there was no
>
> > point in pushing things further.
>
> >
>
> > The torque curve is distinguished by it's flatness; varying only by 10
>
> > ft-lbs from 210 ft-lbs at 4000 rpm to a peak of 220 ft-lbs at 5000 -
>
> > nearly constant from 4800 to 6800. The 220 ft-lbs is not
>
> > extraordinary, and could be improved by 9.7 compression rotors vs the
>
> > stock 9.0 rotors that are in the engine. Mazda's data indicates about
>
> > a 4% increase in power with 9.7 vs 9.0 at 5000 rpm. It may also
>
> > improve some as the engine wears in - this is an engine with only a
>
> > couple of hours of running since overhaul.
>
>
>
>The 20B is going to make one hell of an aircraft engine.
>
>I can't wait to see one of these engines in an air race.
>
>The Lycoming weenies are going to wonder where the severe head wind
>came from :) And this is only 87 HP per rotor at the benchmark RPM
>of 6000.
>
>
>
>Paul Lamar
>
>
>
>
>
>
>Attachment converted: Macintosh HD:power - torque1.gif (GIFf/ogle) (00022A41)
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--></style><title>Re: REFLECTOR:Rotary 20B dyno
Test</title></head><body>
<div>Rock on, rotory guy. Very impressive results, and I'm
envious of how silky smooth it's going to be when you get
airborne.</div>
<div><br></div>
<div>Dennis Martin</div>
<div>Elite FG Chevy V-6</div>
<div><br></div>
<blockquote type="cite" cite><font face="Verdana" size="-1"
color="#0000FF"> </font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1" color="#0000FF">I've
completed dynamometer testing of my 3-rotor rotary engine.
Overall; I'm very pleased. Great performance from a
normally aspirated engine where the all-up installation weighs maybe
45 lbs more than a 200 hp Lyc. It should give me about 270 HP at
my max operating point of 2900 prop speed. The following is a
post to the rotary engine list (including a response from a rotary
Guru), and a plot of sea level torque and HP. More info will
eventually be available on my website.</font><br>
</blockquote>
<blockquote type="cite" cite><font face="Verdana" size="-1"
color="#0000FF"> </font><br>
</blockquote>
<blockquote type="cite" cite><font face="Verdana" size="-1"
color="#0000FF">Al Gietzen</font><br>
</blockquote>
<blockquote type="cite" cite><font face="Verdana" size="-1"
color="#0000FF"> </font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">POWER AND
TORQUE</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">></font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> Wide open throttle
power and torque curves were run after adjusting</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> the mixture
correction table and the timing. Mixture setting was</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> approximately for
maximum power. Data was initially gathered up to</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> about 6000 RPM, but
looking at the data showed that the torque curve</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> was still flat, and
hp increasing, so subsequent runs were made to</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> 7000 RPM. Still no
break in the hp curve. Given that the 2.17 redrive</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> ratio limits engine
RPM to about 6300 (Prop @ 2900), there was no</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> point in pushing
things further.</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">></font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> The torque curve is
distinguished by it's flatness; varying only by 10</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> ft-lbs from 210
ft-lbs at 4000 rpm to a peak of 220 ft-lbs at 5000 -</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> nearly constant from
4800 to 6800. The 220 ft-lbs is not</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> extraordinary, and
could be improved by 9.7 compression rotors vs the</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> stock 9.0 rotors
that are in the engine. Mazda's data indicates about</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> a 4% increase in
power with 9.7 vs 9.0 at 5000 rpm. It may also</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> improve some as the
engine wears in - this is an engine with only a</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">> couple of hours of
running since overhaul.</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1"> </font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">The 20B is going to make
one hell of an aircraft engine.</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">I can't wait to see one
of these engines in an air race.</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">The Lycoming weenies are
going to wonder where the severe head wind came from :) And this is
only 87 HP per rotor at the benchmark RPM of 6000.</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1"> </font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">Paul Lamar</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1"> </font><br>
</blockquote>
<blockquote type="cite" cite><font face="Verdana" size="-1"
color="#0000FF"> </font><br>
</blockquote>
<blockquote type="cite" cite><br>
Attachment converted: Macintosh HD:power - torque1.gif (GIFf/ogle)
(00022A41)</blockquote>
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