The bare engine weight is 260 pounds. My guess is you could get about
20
pounds per housing of it if there were a 20 B aluminum intermediate
housing
available. Unfortunately that is not the case. There is another way to
go however and that is use the Guru special 3 rotor shaft and main
bearing set up. In that case the stock 20B intermediate housing is
replaced
by a 13B intermediate housing. Bottom line roughly 200 pounds.
--
Paul Lamar ...No rotor no motor.
Paul,
I'm not sure this comment is correct with respect to GURU. All your
engine specs are correct I'm sure, but in my communications with GURU
They said the 3 rotor shaft they currently make replaces the stock 3
rotor e-shaft. There is no reason they couldn't make it to run their
added bearings, but so far they don't. They also said that the pictures
that we have seen to make a 4 rotor shaft the same way are NOT THEIRS.
They said it looked like their shaft, and they thought it might have
been photo shopped! They ARE thinking about making a shaft of this type
though. IMO The 4 rotor using the standard intermediate housings would
be the way to go. It would be almost the same length as a Mazda standard
3 rotor, with 1/3 more displacement added. IF we could do that engine
with aluminum or hybrid housings you would have the world beater Reno
race engine! De tuned it would be a super 560 replacement with way more
power.
Bill Jepson
Somebody is some where. I know Hurley engineering gets them
someplace.
Guru make two kinds of 2 rotor shafts. Stock and special with center main.
No reason they can's do the same for 3 or 4 rotors.
Here is a shot of a four rotor that uses the same trick.
Paul Lamar ...No rotor no motor.
Paul,
That 4-rotor is amazing! With aluminum end and intermediate housings, it
should be under 300lb. The torsional vibration should be almost
non-existent so the PSRU could be less than 50lb! This thing could compete
with a P&W PT-6! The only question about it is the crank strength at the
flywheel end. Would it need a dampener in front like V-8's do?
Steve
Perhaps. When you get up to four rotors e-shaft torsional stiffness becomes
an issue. One way to test it is lock the front of the shaft, twist the back
of the shaft with the flex plate and torque damper installed and
then use a magnetic pickup triggered by the starter teeth to monitor the
resonant frequency.
Paul Lamar ...No rotor no motor.
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