REFLECTOR:Rotary 20B dyno Test
Ronnie Brown
reflector@tvbf.org
Sat, 10 May 2003 18:28:01 -0400
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And congratulations to you too, JP!!!
A long road with light at the end - I know you are tickled with your new plane and diesel.
Ronnie Brown
173 Elite RG - Lycasaurus - 34 hours!
----- Original Message -----
From: J.P. Brooks
To: reflector@tvbf.org
Sent: Saturday, May 10, 2003 5:18 PM
Subject: Re: REFLECTOR:Rotary 20B dyno Test
Great news!
Best of luck.... seriously.
JP Brooks
DeltaHawk, Inc.
At 01:32 PM 5/9/2003 -0600, you wrote:
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
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<DIV><FONT size=3D2>And congratulations to you too, JP!!!</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>A long road with light at the end - I know you are =
tickled=20
with your new plane and diesel. </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Ronnie Brown</FONT></DIV>
<DIV><FONT size=3D2>173 Elite RG - Lycasaurus - 34 hours!</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV> </DIV>
<DIV style=3D"FONT: 10pt arial">----- Original Message -----=20
<DIV style=3D"BACKGROUND: #e4e4e4; font-color: black"><B>From:</B> <A=20
title=3Djp@cwebs.com href=3D"mailto:jp@cwebs.com">J.P. Brooks</A> </DIV>
<DIV><B>To:</B> <A title=3Dreflector@tvbf.org=20
href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A> </DIV>
<DIV><B>Sent:</B> Saturday, May 10, 2003 5:18 PM</DIV>
<DIV><B>Subject:</B> Re: REFLECTOR:Rotary 20B dyno Test</DIV></DIV>
<DIV><BR></DIV>Great news!<BR>Best of luck.... seriously.<BR>JP=20
Brooks<BR>DeltaHawk, Inc.<BR><BR><BR>At 01:32 PM 5/9/2003 -0600, you =
wrote:<BR>
<BLOCKQUOTE class=3Dcite cite type=3D"cite">Rock on, rotory guy. =
Very=20
impressive results, and I'm envious of how silky smooth it's going to =
be when=20
you get airborne.<BR><BR>Dennis Martin<BR>Elite FG Chevy V-6<BR><BR>
<BLOCKQUOTE class=3Dcite cite type=3D"cite"><FONT face=3DVerdana =
color=3D#0000ff=20
size=3D2></FONT><BR><FONT color=3D#0000ff size=3D2>I've completed =
dynamometer=20
testing of my 3-rotor rotary engine. Overall; I'm very =
pleased. =20
Great performance from a normally aspirated engine where the all-up=20
installation weighs maybe 45 lbs more than a 200 hp Lyc. It =
should=20
give me about 270 HP at my max operating point of 2900 prop =
speed. The=20
following is a post to the rotary engine list (including a response =
from a=20
rotary Guru), and a plot of sea level torque and HP. More info =
will=20
eventually be available on my website.</FONT><BR><FONT =
face=3DVerdana=20
color=3D#0000ff size=3D2> </FONT><BR><FONT face=3DVerdana =
color=3D#0000ff=20
size=3D2>Al Gietzen</FONT><BR><FONT face=3DVerdana color=3D#0000ff=20
size=3D2> </FONT><BR><FONT size=3D2>POWER AND =
TORQUE</FONT><BR><FONT=20
size=3D2>></FONT><BR><FONT size=3D2>> Wide open throttle power =
and torque=20
curves were run after adjusting</FONT><BR><FONT size=3D2>> the =
mixture=20
correction table and the timing. Mixture setting =
was</FONT><BR><FONT=20
size=3D2>> approximately for maximum power. Data was =
initially=20
gathered up to</FONT><BR><FONT size=3D2>> about 6000 RPM, but =
looking at=20
the data showed that the torque curve</FONT><BR><FONT size=3D2>> =
was still=20
flat, and hp increasing, so subsequent runs were made =
to</FONT><BR><FONT=20
size=3D2>> 7000 RPM. Still no break in the hp curve. Given =
that the=20
2.17 redrive</FONT><BR><FONT size=3D2>> ratio limits engine RPM =
to about=20
6300 (Prop @ 2900), there was no</FONT><BR><FONT size=3D2>> point =
in=20
pushing things further.</FONT><BR><FONT =
size=3D2>></FONT><BR><FONT=20
size=3D2>> The torque curve is distinguished by it's flatness; =
varying only=20
by 10</FONT><BR><FONT size=3D2>> ft-lbs from 210 ft-lbs at 4000 =
rpm to a=20
peak of 220 ft-lbs at 5000 -</FONT><BR><FONT size=3D2>> nearly =
constant=20
from 4800 to 6800. The 220 ft-lbs is not</FONT><BR><FONT =
size=3D2>>=20
extraordinary, and could be improved by 9.7 compression rotors vs=20
the</FONT><BR><FONT size=3D2>> stock 9.0 rotors that are in the=20
engine. Mazda's data indicates about</FONT><BR><FONT =
size=3D2>> a 4%=20
increase in power with 9.7 vs 9.0 at 5000 rpm. It may=20
also</FONT><BR><FONT size=3D2>> improve some as the engine wears =
in - this=20
is an engine with only a</FONT><BR><FONT size=3D2>> couple of =
hours of=20
running since overhaul.</FONT><BR><FONT =
size=3D2> </FONT><BR><FONT=20
size=3D2>The 20B is going to make one hell of an aircraft=20
engine.</FONT><BR><FONT size=3D2>I can't wait to see one of these =
engines in=20
an air race.</FONT><BR><FONT size=3D2>The Lycoming weenies are going =
to wonder=20
where the severe head wind came from :) And this is only 87 HP per =
rotor at=20
the benchmark RPM of 6000.</FONT><BR><FONT =
size=3D2> </FONT><BR><FONT=20
size=3D2>Paul Lamar</FONT><BR><FONT size=3D2> </FONT><BR><FONT =
face=3DVerdana=20
color=3D#0000ff size=3D2> </FONT><BR><BR>Attachment converted: =
Macintosh=20
HD:power - torque1.gif (GIFf/ogle)=20
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