REFLECTOR:Engine Progress
Greg Poole
reflector@tvbf.org
Sun, 11 May 2003 09:40:28 +1000
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JP,
Just how much further along is the inverted 200HP Deltahawk =
realistically (ugh!) likely to be? ....and will it likely have a more =
streamlined cowl for the Velocity.
Still interested,
Greg in Sydney
Std RG Velocity Down Under.
Ph: 9899 2737 Fax: 9899 2726
----- Original Message -----=20
From: Ronnie Brown=20
To: reflector@tvbf.org=20
Sent: Sunday, May 11, 2003 8:28 AM
Subject: Re: REFLECTOR:Rotary 20B dyno Test
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. =20
Ronnie Brown
173 Elite RG - Lycasaurus - 34 hours!
----- Original Message -----=20
From: J.P. Brooks=20
To: reflector@tvbf.org=20
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.
=20
Al Gietzen
=20
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.
=20
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.
=20
Paul Lamar
=20
=20
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<DIV><FONT face=3DArial color=3D#800000>JP,</FONT></DIV>
<DIV><FONT face=3DArial color=3D#800000></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#800000>Just how much further along is =
the inverted=20
200HP Deltahawk realistically (ugh!) likely to be? ....and will it =
likely=20
have a more streamlined cowl for the Velocity.</FONT></DIV>
<DIV><FONT face=3DArial color=3D#800000></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#800000>Still interested,</FONT></DIV>
<DIV><FONT face=3DArial color=3D#800000></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#800000>Greg in Sydney</FONT></DIV>
<DIV>Std RG Velocity Down Under.<BR>Ph: 9899 2737 Fax: 9899 =
2726<BR></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #800000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dromott@adelphia.net =
href=3D"mailto:romott@adelphia.net">Ronnie=20
Brown</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector@tvbf.org=20
href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, May 11, 2003 8:28 =
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: REFLECTOR:Rotary =
20B dyno=20
Test</DIV>
<DIV><BR></DIV>
<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=20
wrote:<BR>
<BLOCKQUOTE class=3Dcite cite=3D"" type=3D"cite">Rock on, rotory =
guy. Very=20
impressive results, and I'm envious of how silky smooth it's going =
to be=20
when you get airborne.<BR><BR>Dennis Martin<BR>Elite FG Chevy =
V-6<BR><BR>
<BLOCKQUOTE class=3Dcite cite=3D"" type=3D"cite"><FONT =
face=3DVerdana=20
color=3D#0000ff size=3D2></FONT><BR><FONT color=3D#0000ff =
size=3D2>I've completed=20
dynamometer testing of my 3-rotor rotary engine. Overall; =
I'm very=20
pleased. Great performance from a normally aspirated engine =
where=20
the all-up installation weighs maybe 45 lbs more than a 200 hp =
Lyc. =20
It should give me about 270 HP at my max operating point of 2900 =
prop=20
speed. The following is a post to the rotary engine list =
(including=20
a response from a rotary Guru), and a plot of sea level torque and =
HP. More info will eventually be available on my=20
website.</FONT><BR><FONT face=3DVerdana color=3D#0000ff=20
size=3D2> </FONT><BR><FONT face=3DVerdana color=3D#0000ff =
size=3D2>Al=20
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=20
torque curves were run after adjusting</FONT><BR><FONT =
size=3D2>> the=20
mixture correction table and the timing. Mixture setting=20
was</FONT><BR><FONT size=3D2>> approximately for maximum =
power. =20
Data was initially gathered up to</FONT><BR><FONT size=3D2>> =
about 6000=20
RPM, but looking at the data showed that the torque =
curve</FONT><BR><FONT=20
size=3D2>> was still flat, and hp increasing, so subsequent =
runs were=20
made to</FONT><BR><FONT size=3D2>> 7000 RPM. Still no break in =
the hp=20
curve. Given that the 2.17 redrive</FONT><BR><FONT =
size=3D2>> ratio=20
limits engine RPM to about 6300 (Prop @ 2900), there was=20
no</FONT><BR><FONT size=3D2>> point in pushing things=20
further.</FONT><BR><FONT size=3D2>></FONT><BR><FONT =
size=3D2>> The=20
torque curve is distinguished by it's flatness; varying only by=20
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 =
engine. Mazda's data indicates about</FONT><BR><FONT =
size=3D2>> a=20
4% 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 -=20
this is an engine with only a</FONT><BR><FONT size=3D2>> couple =
of hours=20
of 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=20
wonder where the severe head wind came from :) And this is only 87 =
HP per=20
rotor at the benchmark RPM of 6000.</FONT><BR><FONT=20
size=3D2> </FONT><BR><FONT size=3D2>Paul =
Lamar</FONT><BR><FONT=20
size=3D2> </FONT><BR><FONT face=3DVerdana color=3D#0000ff=20
size=3D2> </FONT><BR><BR>Attachment converted: Macintosh =
HD:power -=20
torque1.gif (GIFf/ogle)=20
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