REFLECTOR:Rotarys, Lycosaurs, etc.

Jim Sower reflector@tvbf.org
Thu, 06 Nov 2003 00:51:19 -0600


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<... youíll find yourself in a tough spot.  We havenít proven
ourselves yet ...>
Agreed.
<... wanted to make the point that it isnít easy and it isnít
for everyone ...>
Agreed.

<... rotaries have proven to be more robust when pushed (turbo
and high RPM) ...>
Actually, I don't know of any rotaries in aircraft operating
past 6000 rpm, and that's about the equivalent of 3500 or so rpm
in a recip.  I know of a couple of turbos, but none boosting
over 20" which is not harsh for a rotary.

Soob seems to have a bullet proof block, but the parts count
spooks me, as does the fact that maybe 80% of all those parts
are driven by a rubber band.  But that can be addressed.

<... run it for most or all of season ... piston guys expect to
overhaul after a race or two ...>
That would go to reliability.

<... homebuilt installations of certified engines have more
engine related issues ...>
Also, the auto failures are typically ancillary system failures
(like your exhaust example).  I don't know if I ever heard of a
block failing in an auto conversion.

<... the jury is still out until hours are accumulated ...>
Agreed.  But hours are now being accumulated very fast.  There
are very few data points which is a major problem, and the
successes are not so widely known as the failures (witness the
responses I got confirming the reliability of Lycs beyond
anything I had ever witnessed).

<... Hey; thatís just me ...>
And me.  You couldn't be more right that it's not for everyone.
My feeling is that what little data we have gets a lot more
negative spin than it deserves and that will start to turn
around in the near future.  Then lots more folks will venture
into the water and things will REALLY move.

Best of luck with your rotary ... how long do you guess until
you fly?  Jim S.



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<div class="MsoNormal" style="margin-left:.5in"><font face="Verdana"><font size=-1><font color="#0000FF">&lt;...
youíll find yourself in a tough spot.&nbsp; We havenít proven ourselves
yet ...></font><font color="#000000"></font></font></font></div>

<div class="MsoNormal" style="margin-left:.5in"><font face="Verdana"><font color="#000000"><font size=-1>Agreed.</font></font></font></div>

<div class="MsoNormal" style="margin-left:.5in"><font face="Verdana"><font size=-1><font color="#0000FF">&lt;...
wanted to make the point that it isnít easy and it isnít for everyone ...></font><font color="#000000"></font></font></font></div>

<div class="MsoNormal" style="margin-left:.5in"><font face="Verdana"><font color="#000000"><font size=-1>Agreed.</font></font></font></div>

<br><font face="Verdana"><font size=-1><font color="#0000FF">&lt;... rotaries
have proven to be more robust when pushed (turbo and high RPM) ...></font><font color="#000000"></font></font></font>
<br><font face="Verdana"><font color="#000000"><font size=-1>Actually,
I don't know of any rotaries in aircraft operating past 6000 rpm, and that's
about the equivalent of 3500 or so rpm in a recip.&nbsp; I know of a couple
of turbos, but none boosting over 20" which is not harsh for a rotary.</font></font></font><font face="Verdana"><font color="#000000"><font size=-1></font></font></font>
<p><font face="Verdana"><font color="#000000"><font size=-1>Soob seems
to have a bullet proof block, but the parts count spooks me, as does the
fact that maybe 80% of all those parts are driven by a rubber band.&nbsp;
But that can be addressed.</font></font></font><font face="Verdana"><font color="#000000"><font size=-1></font></font></font>
<p><font face="Verdana"><font size=-1><font color="#0000FF">&lt;... run
it for most or all of season ... piston guys expect to overhaul after a
race or two ...></font><font color="#000000"></font></font></font>
<br><font face="Verdana"><font color="#000000"><font size=-1>That would
go to reliability.</font></font></font>
<p><font face="Verdana"><font size=-1><font color="#0000FF">&lt;... homebuilt
installations of certified engines have more engine related issues ...></font><font color="#000000"></font></font></font>
<br><font face="Verdana"><font color="#000000"><font size=-1>Also, the
auto failures are typically ancillary system failures (like your exhaust
example).&nbsp; I don't know if I <b>ever</b> heard of a block failing
in an auto conversion.</font></font></font><font face="Verdana"><font color="#000000"><font size=-1></font></font></font>
<p><font face="Verdana"><font size=-1><font color="#0000FF">&lt;... the
jury is still out until hours are accumulated ...></font><font color="#000000"></font></font></font>
<br><font face="Verdana"><font color="#000000"><font size=-1>Agreed.&nbsp;
But hours are now being accumulated very fast.&nbsp; There are very few
data points which is a major problem, and the successes are not so widely
known as the failures (witness the responses I got confirming the reliability
of Lycs beyond anything I had ever witnessed).</font></font></font><font face="Verdana"><font color="#000000"><font size=-1></font></font></font>
<p><font face="Verdana"><font size=-1><font color="#0000FF">&lt;... Hey;
thatís just me ...></font><font color="#000000"></font></font></font>
<br><font face="Verdana"><font color="#000000"><font size=-1>And me.&nbsp;
You couldn't be more right that it's not for everyone.&nbsp; My feeling
is that what little data we have gets a lot more negative spin than it
deserves and that will start to turn around in the near future.&nbsp; Then
lots more folks will venture into the water and things will REALLY move.</font></font></font><font face="Verdana"><font color="#000000"><font size=-1></font></font></font>
<p><font face="Verdana"><font color="#000000"><font size=-1>Best of luck
with your rotary ... how long do you guess until you fly?&nbsp; Jim S.</font></font></font>
<br>&nbsp;
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