REFLECTOR:540 engine prices

Tue, 4 Nov 2003 09:37:29 -0600

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Hi Al,

    I've got a Turrentine normally aspirated 20B sitting on the garage =
floor I'm going to put in my standard Velocity (Actually it's an SUV =
that I'm putting the second door on to make it a standard.)  --  Pretty =
much the same exact package as Tracy Crook's new engine because I've got =
everything he makes to hang on it the same as his.  The question I have =
on exhaust, since you are way ahead of me here is why you did a rear =
exit rather than an "S" curve and a front exit.  Is there just too =
little room for the extra piece of pipe, the three pound weight penalty, =
or the mechanical problem of safely hanging the forward facing exhaust =
that directed your decision?
    Oh, by the way, thanks for having the nerve to introduce the rotary =
option to the Reflector :-)  A lot of guys have got flamed for much less =
than that on here :-)  Once we're closer to a firewall back package (and =
we're getting there pretty quickly) even the most critical piston =
advocates are going to realize we have pretty close to the reliability =
of a turbine and the efficiency of a piston all in one engine.  --  But =
that's a discussion for another day :-)

Robin
  ----- Original Message -----=20
  From: Al Gietzen=20
  To: reflector@tvbf.org=20
  Sent: Tuesday, November 04, 2003 8:58 AM
  Subject: RE: REFLECTOR:540 engine prices

  Looks GREAT!  Some questions just because I'm curious and fascinated =
with

  the rotary solution.  So how many power pulses per crank revolution =
and

  prop revolution? What will be the cruise RPM?  So will the exhaust be

  clocked to the prop?  Is that possible with a rotary?  I have been =
told

  that rotary engines have a hot exhaust, will that be a challenge to

  accommodate?  What prop are you using?

  Jerry

  It is the same as a 6-cyclinder engine with 3 power pulses for one =
turn of the output shaft.  The re-drive ratio here is 2.17 : 1 so there =
are 6.5 pulses per rev of the prop. The rotors turn at 1/3 the speed of =
the output shaft and each rotor fires 3 times (3 faces on each rotor) =
for each complete revolution.

  Cruise PRM will typically be 2300 - 2400 prop or about 5000-5200 on =
engine shaft.  No way to clock the prop to the exhaust pulse.  Yes, =
rotary engines have hot exhaust, about 150 higher than your usual =
vibrating, piston  . . ah, whoops; certified aircraft engine.  Yes it is =
a challenge to accommodate, but then a custom engine installation isn't =
anything if it isn't challenging.  I'm using a 6" prop extension (I can =
do that because my total engine package CG is only about 16" from the =
firewall) which will get it back a bit from the exhaust pipe, and I will =
have a yet-to-be-determined diffuser/deflector at the end of the pipe - =
and then we'll see.

  I'm using a 66" x 85 pitch, 3-blade Catto prop until a =
reasonably-priced, reasonable weight, reliable CS prop happens (I'm not =
holding my breath).  Catto prop is light weight and only $1650.

  I'll know a lot more when it flies; always next year.

  Al

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<BODY lang=3DEN-US vLink=3Dpurple link=3Dblue bgColor=3D#ffffff>
<DIV>Hi Al,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp; I've got a Turrentine normally aspirated 20B =
sitting on=20
the garage floor I'm going to put in my standard Velocity (Actually it's =
an SUV=20
that I'm putting the second door on to make it a standard.)&nbsp; =
--&nbsp;=20
Pretty much the same exact package as Tracy Crook's new engine because =
I've got=20
everything he makes to hang on it the same as his.&nbsp; The question I =
have on=20
exhaust, since you are way ahead of me here is why you did a rear exit =
rather=20
than an "S" curve and a front exit.&nbsp; Is there just too little room =
for the=20
extra piece of pipe, the three pound weight penalty, or the mechanical =
problem=20
of safely hanging the forward facing exhaust that directed your =
decision?</DIV>
<DIV>&nbsp;&nbsp;&nbsp; Oh, by the way, thanks for having the nerve to =
introduce=20
the rotary option to the Reflector :-)&nbsp; A lot of guys have got =
flamed for=20
much less than that on here :-)&nbsp; Once we're closer to a firewall =
back=20
package (and we're getting there pretty quickly) even the most critical =
piston=20
advocates are going to realize we have pretty close to the reliability =
of a=20
turbine and the efficiency of a piston all in one engine.&nbsp; --&nbsp; =
But=20
that's a discussion for another day :-)</DIV>
<DIV>&nbsp;</DIV>
<DIV>Robin</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 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=3DALVentures@cox.net href=3D"mailto:ALVentures@cox.net">Al =
Gietzen</A>=20
  </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> Tuesday, November 04, =
2003 8:58=20
  AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: REFLECTOR:540 =
engine=20
  prices</DIV>
  <DIV><BR></DIV>
  <DIV class=3DSection1>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt">Looks GREAT!&nbsp; Some questions just =
because I'm=20
  curious and fascinated with</SPAN></FONT></P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt">the rotary solution.&nbsp; So how many power =
pulses=20
  per crank revolution and</SPAN></FONT></P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt">prop revolution? What will be the cruise =
RPM?&nbsp; So=20
  will the exhaust be</SPAN></FONT></P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt">clocked to the prop?&nbsp; Is that possible =
with a=20
  rotary?&nbsp; I have been told</SPAN></FONT></P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt">that rotary engines have a hot exhaust, will =
that be a=20
  challenge to</SPAN></FONT></P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt">accommodate?&nbsp; What prop are you=20
  using?</SPAN></FONT></P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt">Jerry</SPAN></FONT></P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoPlainText><FONT face=3DVerdana size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; FONT-FAMILY: Verdana">It is the same as a =
6-cyclinder=20
  engine with 3 power pulses for one turn of the output shaft.&nbsp; The =

re-drive ratio here is 2.17 : 1 so there are 6.5 pulses per rev of the =
prop.=20
 The rotors turn at 1/3 the speed of the output shaft and each rotor =
fires 3=20
 times (3 faces on each rotor) for each complete =
revolution.
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: =
Verdana">&nbsp;
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: Verdana">Cruise =
PRM will=20
 typically be 2300 =96 2400 prop or about 5000-5200 on engine =
shaft.&nbsp; No way=20
 to clock the prop to the exhaust pulse.&nbsp; Yes, rotary engines have =
hot=20
 exhaust, about 150 higher than your usual vibrating, piston &nbsp;. . =
ah,=20
 whoops; certified aircraft engine. &nbsp;Yes it is a challenge to =
accommodate,=20
 but then a custom engine installation isn=92t anything if it isn=92t=20
 challenging.&nbsp; I=92m using a 6=94 prop extension (I can do that =
because my=20
 total engine package CG is only about 16=94 from the firewall) which =
will get it=20
 back a bit from the exhaust pipe, and I will have a =
yet-to-be-determined=20
 diffuser/deflector at the end of the pipe =96 and then we=92ll=20
 see.
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: =
Verdana">&nbsp;
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: Verdana">I=92m =
using a 66=94 x=20
 85 pitch, 3-blade Catto prop until a reasonably-priced, reasonable =
weight,=20
 reliable CS prop happens (I=92m not holding my breath).&nbsp; Catto =
prop is=20
 light weight and only $1650.
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: =
Verdana">&nbsp;
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: Verdana">I=92ll =
know a lot=20
 more when it flies; always next year.
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: =
Verdana">&nbsp;
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: =
Verdana">Al</DIV></BLOCKQUOTE></BODY></HTML>

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