REFLECTOR:540 engine prices
Al Gietzen
reflector@tvbf.org
Tue, 4 Nov 2003 06:58:41 -0800
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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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<div class=3DSection1>
<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'> </span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>Looks
GREAT! Some questions just because I'm curious and fascinated =
with</span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>the
rotary solution. So how many power pulses per crank revolution =
and</span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>prop
revolution? What will be the cruise RPM? So will the exhaust =
be</span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>clocked
to the prop? Is that possible with a rotary? I have been =
told</span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>that
rotary engines have a hot exhaust, will that be a challenge =
to</span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>accommodate?
What prop are you using?</span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'> </span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>Jerry</span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'> </span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'> </span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3DVerdana><span =
style=3D'font-size:11.0pt;
font-family:Verdana'>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.</span></font></p>
<p class=3DMsoPlainText><font size=3D2 color=3Dblack =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:black'> </span><=
/font></p>
<p class=3DMsoPlainText><font size=3D2 color=3Dblack =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:black'>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.</span></font></p>
<p class=3DMsoPlainText><font size=3D2 color=3Dblack =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:black'> </span><=
/font></p>
<p class=3DMsoPlainText><font size=3D2 color=3Dblack =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:black'>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.</span></font></p>
<p class=3DMsoPlainText><font size=3D2 color=3Dblack =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:black'> </span><=
/font></p>
<p class=3DMsoPlainText><font size=3D2 color=3Dblack =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:black'>I’ll =
know a lot
more when it flies; always next year.</span></font></p>
<p class=3DMsoPlainText><font size=3D2 color=3Dblack =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:black'> </span><=
/font></p>
<p class=3DMsoPlainText><font size=3D2 color=3Dblack =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:black'>Al</span></fon=
t></p>
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